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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 46, Issue 1
Displaying 1-50 of 64 articles from this issue
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H. M. Agrawal, M. L. Sehgal1979 Volume 46 Issue 1 Pages 1-5
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNeutron-capture cross-sections are calculated using Margolis formula based on statistical theory at 24 keV for 48 nuclei, using low energy resonance parameters. In these calculations we have taken into account the contribution due to s-, p- and d-wave neutrons. In general, the agreement between the theoretical and the experimental cross-sections for the cases enumerated is satisfactory, when ⟨Γγ⟩⁄⟨D⟩ is taken to be the same for s- and p-wave neutrons.View full abstractDownload PDF (652K) -
Tadafumi Kishimoto, Shintaro Nakayama, Noriaki Takahashi, Hiroyasu Eji ...1979 Volume 46 Issue 1 Pages 6-12
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPopulations of ground state rotational levels following (3He, 3n) and (α, 2n) reactions were studied by measuring gamma rays and conversion electrons for the ground state rotational transitions. Typical three rare-earth nuclei of 152Sm, 164Er and 174Hf were investigated. Both delayed and prompt feedings of the rotational levels were precisely measured. Results are well interpreted in terms of the K-band deexcitation model for the gamma deexcitation process.View full abstractDownload PDF (800K) -
Satoru Kunii, Tadao Kasuya1979 Volume 46 Issue 1 Pages 13-17
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectron spin resonance (ESR) in antiferromagnetic EuB6 single crystal was observed and compared with the results of ESR in EuB6 ferromagnetic bulk poly-crystals. No anisotropy was observed in EuB6 single crystal in all temperatures and all frequency bands in this experiment. Resonance points in single crystal move rapidly to lower fields as temperature is lowered. The shifts of the resonance field should be interpreted by a dynamical anisotropy field. Resonance line width increases with decreasing temperature especially for the cases of single crystal and lower frequencies.View full abstractDownload PDF (520K) -
Hideo Takeuchi, Kazumi Horai, Masanori Arakawa1979 Volume 46 Issue 1 Pages 18-25
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESS51V-ENDOR measurements for a substitutional V2+ impurity center in KMgF3 and KZnF3 have been made using a microwave frequency of 35 GHz. The spin-Hamiltonian parameters including higher order hyperfine interaction term U(S3I) have been determined as following values: A=−258.337±0.005 MHz, gIβN⁄h=(11.255±0.005)×10−4 MHz/G, U=0.110±0.005 MHz for KMgF3, and A=−259.157±0.005 MHz, gIβN⁄h=(11.260±0.005)×10−4 MHz/G, U=0.118±0.005 MHz for KZnF3. To interprete the parameter U, calculation for V2+ in a cubic octahedral crystalline field including the contribution from excited 2G term is carried out. Other parameters are also discussed. A new value for the nuclear magnetic moment of 51V nucleus is proposed.View full abstractDownload PDF (944K) -
Walter Sano, Sadao Isotani, José Alberto Ochi, José Carl ...1979 Volume 46 Issue 1 Pages 26-29
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEPR spectra of Ni(BF4)26H2O single crystal were obtained between 100 K and 300 K. An analysis of the spectra indicated a slightly distorted crystal field from the cubic symmetry, with trigonal axis along the c-axis of the crystal. The spin Hamiltonian parameters g⁄⁄, g⊥ and D were determined in the above range of temperatures. D varies linearly as D=0.021(1+0.081T) cm−1 probably due to the phonon modulation of the octahedron of the 6H2O charges. The line-width of the spectra obeys a ΔHms=a+bT2 law. The quadratic term comes from the spin-lattice relaxation by a two-phonon Raman process and the constant term represents spin-spin interaction contribution. No phase transition was detected and it is likely that this salt is more stable than some other isomorphous compounds where structure transformation was observed.View full abstractDownload PDF (384K) -
Hironobu Ikeda, Gen Shirane1979 Volume 46 Issue 1 Pages 30-35
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have examined the magnetic excitations in random magnetic and non-magnetic Ising-like antiferromagnets Rb2CocMg1−cF4 with c=0.89 and c=0.70 using neutron inelastic scattering techniques. The dynamic response function splits into four excitations throughout the Brillouin zone which are associated with the highly anisotropic Ising nature of Co ions. The intensity distributions at the Brillouin zone boundary are in accord with the probability of local distributions of magnetic neighbors of Co ions.View full abstractDownload PDF (652K) -
Tatsuo Kobayashi, Masayuki Kawakami, Tadao Kasuya1979 Volume 46 Issue 1 Pages 36-39
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe specific heat Cp of the ordered Pr3Tl has been measured between 0.4 and 4 K. It is expressed as Cp=0.25T+0.530T−2 J/mole K at low temperatures. The second term gives the square average of magnetization ⟨M2⟩1⁄2=1.3 μB/Pr. The spontaneous magnetization ⟨M⟩ of the same sample has also been found to be 0.75∼0.8 μB/Pr. Pr3Tl is thought to have a canting type ordering with the common ferromagnetic direction on the [111] axis. The canting angle is determined to be 45∼48° from the [111] direction to the [100] direction.View full abstractDownload PDF (440K) -
Tsuyoshi Murao1979 Volume 46 Issue 1 Pages 40-44
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effective nuclear spin Hamiltonian is derived for the system where magnetic ions have the electronic singlet ground state and are in a magnetically ordered state. As in the nuclear regime, the effective Hamiltonian involves the I–I coupling, the pseudo-nuclear quadrupole interaction, the pseudo-nuclear Zeeman energy, which are all exchange-enhanced, in addition to the internal field term due to the ordered electron spins. The exchange enhancement factor may be different from that in the paramagnetic state. The recent experimental data on Pr3Tl are discussed in terms of the effective Hamiltonian.View full abstractDownload PDF (564K) -
Kiichi Okuda, Kazuo Kadowaki1979 Volume 46 Issue 1 Pages 45-52
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA linear chain antiferromagnet CuCl22NC5H5 was investigated by antiferromagnetic resonance methods. The shift of resonance point due to three-dimensional ordering was observed from 2 K to 0.6 K aroung TN=1.14 K. The antiferromagnetic principal axes in ac-plane decline by 8° from the paramagnetic principal axes and it was explained by introducing an anisotropic exchange interaction (A) in addition to the dipole interaction (B) as A⁄B=2.3. The observed antiferromagnetic resonance modes were satisfactorily explained by assuming two sublattices with the orthorhombic anisotropy, K1β2+K2γ2 with the anisotripic constants of K1=60 ergs/cm3 and K2=210 ergs/cm3, and the Dzialoshinski-Moriya interaction with D-vector along a spin easy axis which is in the direction declined by 22° from a- to c-axes.View full abstractDownload PDF (840K) -
Kimihito Tagaya, Masaya Fukada1979 Volume 46 Issue 1 Pages 53-58
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWhen the spins of Ni-ferrite precipitates in a single crystal of Fe-doped NiO are coupled with the spins of the antiferromagnetic NiO matrix by exchange interaction across the interface, an exchange anisotropy is produced in each Ni-ferrite precipitate. FMR and magnetization measurements were performed together with electron micrographical examinations on the Ni-ferrite precipitates. The exchange anisotropy energy related to the coupling of spins between Ni-ferrite and NiO across the (111) interface was determined to be 0.9±0.1 erg/cm2.View full abstractDownload PDF (652K) -
Yoshihiro Shiozaki, Yutaka Nakai, Nobuhiko Kunitomi1979 Volume 46 Issue 1 Pages 59-62
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe average magnetic moments of Mn atoms dissolved in fcc Ni–Co alloys have been determined as a function of concentration of host alloys. The measurements were made with alloys containing 2 atomic percent Mn at about 300 K and 100 K by means of diffuse scattering of polarized neutrons. The average magnetic moment of Mn, which is about 3 μB in pure Ni, decreases with increasing Co concentration and changes its direction at about 50 atomic percent Co from parallel to antiparallel to the bulk magnetization of host alloys. This behavior agrees qualitatively with the theoretical results obtained under the assumption of the extended coherent potential approximation, but a quantitative discrepancy is found especially near Co concentration of about 20 to 40 atomic percent.View full abstractDownload PDF (560K) -
Hiromitsu Ino, Susumu Nanao, Takashi Muto1979 Volume 46 Issue 1 Pages 63-71
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAmorphous Pd100−x−ySixFey alloys with the composition of x=15, 17.5, 20 and y=0, 0.3, 1 in at% were investigated. Quadrupole splitting decreases with the increase of silicon content and its extrapolated value almost coincides with that of crystalline Pd3Si(Fe). The result represents the similarity of local atomic configuration of the both structures. Isomer shift of the amorphous alloys is in the range of 0.08∼0.13 mm/s and increases with silicon content, while that of c-Pd3Si(Fe) is a negative value of −0.11 mm/s. The results are explained by the difference in the shielding effect of 57Fe nucleus in both phases.
The amorphous alloys are stable even after 575 hours ageing at 200°C, and crystallize to Pd3Si above 250°C. Our results are different from those obtained by Masumoto et al. The different ageing behaviors may arise from the difference in the microstructure of the examined amorphous materials.View full abstractDownload PDF (1184K) -
Yasushi Hoshino, Kazuyoshi Tateishi1979 Volume 46 Issue 1 Pages 72-76
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhotoconductivity spectra are measured on beta-carotene glass consisting of a mixture of isomers using a sandwich type cell and a surface type cell. In the sandwich cell, the different spectra are obtained by the polarity of the illuminating electrode. When the illuminating electrode is positive, it is concluded that the origin of the photoconductivity spectra in the wavelength below 400 nm is hole photoinjection from the electrode. The photoconductivity band is found in the wavelength 600∼800 nm, and the origin of the band is suggested to be intrinsic.View full abstractDownload PDF (596K) -
Hisashi Nara, Koichi Shindo, Teiji Kobayasi1979 Volume 46 Issue 1 Pages 77-83
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPseudopotential calculation for the anisotropies of the Compton-profiles of Si and Ge has been performed by using an inversion technique, based on the Fourier transform, and the special point method of Chadi and Cohen. No qualitative difference is found between the calculated anisotropies of the Compton-profiles of Si and those of Ge. It is concluded that, for semiconductors such as Si and Ge, the anisotropies of the Compton-profiles are insensitive to the change of the potential used in the band calculation and to a quality of the wave functions for the valence electrons.View full abstractDownload PDF (920K) -
Hiroshi Tokumoto, Takehiko Ishiguro1979 Volume 46 Issue 1 Pages 84-91
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe relaxation time, τ, for the reorientation of the ⟨100⟩-tetragonal Jahn-Teller distorted Cr2+ centers in GaAs was measured by ultrasonic method as a function of temperature. The center yielding the ultrasonic attenuation was identified to be Cr2+, based on the observed selection rule for the acoustic modes. The temperature dependence of 1⁄τ indicates that the relaxation in the temperature range below 20 K is ascribed not to the thermal activation process over the Jahn-Teller barrier but to the phonon-assisted tunnelings.View full abstractDownload PDF (1012K) -
Hiroshi Ikari, Kunio Fujiwara1979 Volume 46 Issue 1 Pages 92-96
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe momentum distribution of photon pairs from positrons annihilating in synthetic crystalline quartz has been measured over a wide temperature range. The width of the narrow component in the distribution was analyzed to yield the positronium effective mass. The effective mass is found to be (1.67±0.15)×2me at low temperature, but appears to increase as the temperature is raised. This result will be discussed in Part II from the view-point of positronium-phonon interaction.
The probability of annihilation from singlet positronium state (i.e., the intensity of the narrow component) also increases as the temperature is raised, and tends to approach to a constant value at sufficiently high temperatures. This result might be attributable to possible temperature dependence of positronium formation probability in quartz.View full abstractDownload PDF (600K) -
Hiroshi Ikari1979 Volume 46 Issue 1 Pages 97-101
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA part of the observed momentum spread of thermalized positronium in crystalline quartz reported in Part I could be attributed to a damping effect of the positronium quasiparticle in the phonon field. As analogized from the case of excitons, the damping constant (the width of the spectral function) for the quasi-particle state is expected to be proportional to the absolute temperature T in the moderate and high temperature regions due to the well-known motional effect in the phonon field. Therefore if we analyze, as in Part I, the observed momentum distribution by using a Maxwellian with effective mass M*(T), the resultant M*(T) would appear to increase with increasing temperature owing to the above-mentioned temperature dependence of the damping effect.View full abstractDownload PDF (480K) -
Hidetoshi Fukuyama, Kei Yosida1979 Volume 46 Issue 1 Pages 102-105
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the mechanism of the electronic conduction due to variable-range hopping in the Anderson localized states gives rise to a large negative magnetoresistance, particularly in the vicinity of the metal-nonmetal transition. This result is mainly caused by an exponential dependence of the hopping rate on the highest occupied energy levels. The same mechanism also leads to a strong electric field-dependence of the conductivity.View full abstractDownload PDF (468K) -
Takeo Iri, Shin-ichi Hirako, Kenjiro Kambe1979 Volume 46 Issue 1 Pages 106-113
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe paramagnetic resonance spectra of Ni2+ in LiCl have been studied at 9 GHz. Two kinds of Ni2+ centers associated with positive ion vacancy in their nearest or next nearest neighbour position are observed. Their spin Hamiltonian parameters are determined to be gx=2.27±0.04, gy=2.26±0.02, gz=2.31±0.01, |D|=0.564±0.002 cm−1, |E|=0.080±0.002 cm−1, and g⁄⁄=2.360±0.005, g⊥=2.30±0.05, |D|=3.1±0.3 cm−1 and |E|\simeq0.0 cm−1.
The Ni2+-vacancy dipoles aggregated to form clusters and the isolated dipoles decayed in number. The decay constant of third order rate process is about 1.2×105 h−1 (mole fraction)−2 at room temperature.
The EPR line width depends upon the crystal orientation. Interaction between near neighbour dipoles contributed to this anisotropic line width.View full abstractDownload PDF (1008K) -
Yasutami Takada1979 Volume 46 Issue 1 Pages 114-122
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe mobility in a two-subband system realized in an n-channel inversion layer at the Si(100)/SiO2 interface under the stress along the [001] direction is calculated at zero temperature. In addition to the two mechanisms—charged impurity scattering and surface roughness scattering, scattering by a neutral impurity composed of a positively charged impurity at the interface and an electron trapped by it is introduced as the third mechnaism. The wave function of the trapped electron is determined variationally and is extended rather widely in the semiconductor to make the scattering cross section large. The screening of electrons in the inversion layer is evaluated in the RPA and the Born approximation is employed to calculate the relaxation time. The combination of these three mechanisms explains the experiment well.View full abstractDownload PDF (1032K) -
Hitoshi Nishimura, Yuuji Tanaka, Hisashi Miyazaki, Chiaki Ohhigashi, M ...1979 Volume 46 Issue 1 Pages 123-131
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn addition to the zero phonon resonance line of the luminescence due to free excitons in the lowest energy band, a few very weak luminescence lines assisted by LO phonons are observed in KI and RbI crystals. The shapes of the zero phonon and LO phonon assisted luminescence lines are studied under the UV light excitation in the first exciton absorption band at a temperature range between 80 K and 3 K. The zero phonon and LO phonon lines in KI and the zero phonon line in RbI are of symmetric Lorentzian shapes below 10 K. They become asymmetric shapes (nearly Maxwellian) above 10 K. Half-widths of the zero phonon and LO phonon lines in both crystals are about 1.4 meV and 4∼5 meV at 3 K, respectively.View full abstractDownload PDF (1076K) -
Hidenao Sugawara, Taizo Sasaki1979 Volume 46 Issue 1 Pages 132-142
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAbsolute photoelectric yield spectra of the halides of potassium, rubidium and cesium, and relative yield spectra at various retarding potentials have been measured in the photon energy range from 10 to 40 eV using synchrotron radiation. Prominent minima followed by broad structures which are not found in optical absorption spectra are observed. The absolute values of the yields are high in the region above the minima. Peaks appear at the photon energies corresponding to core-exciton peaks in absorption spectra. These features suggest that electron-electron scattering and the Auger decay of core-excitons occur predominantly in alkali halides. At large retarding potentials, the yield spectra show two broad bands similar to each other. The electronic transitions responsible for their origins will be discussed.View full abstractDownload PDF (1444K) -
Yoshihiro Ishibashi, Yutaka Takagi1979 Volume 46 Issue 1 Pages 143-147
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOn the basis of a simple model thermodynamic potential of the Landau-Lifshitz type which reproduces the successive phase transitions—first into an incommensurate phase and then into a commensurate phase—in thiourea, several fundamental aspects of lattice vibrations in the incommensurate phase of this material are clarified. The results are discussed in time relationship with Raman and infrared data so far reported.View full abstractDownload PDF (580K) -
Yoshihiro Shiroishi, Shozo Sawada1979 Volume 46 Issue 1 Pages 148-153
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSuccessive phase transitions in RbLiSO4 at about 166, 185, 202 and 204°C have been investigated by an improved high-sensitive DTA, a differential scanning calorimetry and an automatic measurement of dielectric constant. Temperature- and field-dependences of 50 Hz D–E hysteresis loop are studied in detail. In the phase between 166 and 185°C, a triple hysteresis loop due to ferrielectricity is ascertained.View full abstractDownload PDF (732K) -
Takehiko Hidaka1979 Volume 46 Issue 1 Pages 154-156
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRecently observed nonlinear susceptibilities of AlN |d333|=23.3±35% |d311(Quartz)| and |d311|\lesssim0.04|d333| lead us to the conclusion that the bond-ionicity difference Δfi=fix−fiz is −0.20 in AlN, where fix and fiz are the bond ionicities in the x directional (perpendicular to c axis) bond and z directional (parallel to c axis), respectively. The proportionality between the bond-ionicity difference and the distortion Δ(c⁄a) is discussed in the distorted wurtzite type crystals.View full abstractDownload PDF (364K) -
Akira Onodera, Yoichi Shiozaki1979 Volume 46 Issue 1 Pages 157-166
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe crystal structures of (NH4)2BeF4 have been refined at −84°C (paraelectric phase) and −140°C (ferroelectric phase). The three-dimensional data were collected on a four-circle automatic diffractometer with monochromatized MoKα radiation. The final discrepancy factors are 0.039 (−84°C) and 0.036 (−140°C). The change of the distribution of hydrogen atoms in N(2)H4 ion in the ferroelectric phase is due to the reorientation of this ion. In the ferroelectric phase, BeF4 and NH4 ions slightly deviate from the paraelectric structure, which results in stronger N–H···F hydrogen bonds. Because of the hydrogen bonds, N(21)H4 and N(22)H4 ions, which are considered to owe the occurence of ferroelectricity, order in opposite direction along the polar b axis respectively. This suggests that (NH4)2BeF4 is a ferrielectric rather than a ferroelectric.View full abstractDownload PDF (1164K) -
Takeshi Miyanaga1979 Volume 46 Issue 1 Pages 167-175
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe EPR spectra of Ag2+ ions in CdCl2 and CdBr2 are investigated in the temperature range from 4.2 K to 306 K. Low temperature spectra, exhibiting static tetragonal Jahn-Teller distortions, are observed below 77 K. The transition from the low temperature spectra to the motionally averaged high temperature ones is observed between 97 K and 170 K for CdCl2 : Ag2+ and between 98 K and 213 K for CdBr2 : Ag2+. The transition temperature for CdCl2 : Ag2+ depends on the orientation of the crystal and on the position of the super hyperfine line in question, which is explained by the motional averaging model. The anisotropy of the g-value of the low temperature spectrum of CdBr2 : Ag2+ is found to be extraordinarily small (g⁄⁄=2.072, g⊥=2.067 at 77 K). The reasons for this small anisotropy of the g-value are discussed.View full abstractDownload PDF (1212K) -
Shinji Hayashi, Nobuyuki Nakamori, Hitoshi Kanamori1979 Volume 46 Issue 1 Pages 176-183
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTheory of average dielectric constant developed by Genzel and Martin is generalized to the case of randomly oriented ellipsoidal particles having anisotropic dielectric constants. Effects which result from the mixture of different types of particles are also incorporated in the theory. The generalized theory is applied to the calculation of infrared absorption spectra of ZnO small particles. The present calculation can reproduce fairly well the experimental spectra of ZnO smoke reported by Yamamoto et al.View full abstractDownload PDF (1012K) -
Seinosuke Onari, Toshihiro Arai1979 Volume 46 Issue 1 Pages 184-188
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe infrared reflection spectrum of an antiferromagnetic semiconductor MnSe2 was measured in the energy range 30∼1000 cm−1, and four optical phonon modes were observed at 140 cm−1, 157 cm−1, 175 cm−1, and 223 cm−1. The optical constants were calculated by Kramers-Kronig analysis, and were also analyzed by the classical oscillator model. From these dielectric constants, the longitudinal and the transverse optical phonon frequencies were estimated. The Born and Szigeti effective charges were calculated and the ionicities among MnS2, MnSe2, MnTe2 and FeS2 were studied in relation to magnetic properties of these compounds. It is verified also that the generalized Lyddane-Sachs-Teller equation apply well to MnSe2.View full abstractDownload PDF (624K) -
Shinji Muramatsu, Keiichiro Nasu1979 Volume 46 Issue 1 Pages 189-197
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe excitation spectrum for the resonant Raman scattering in the (E×e) Jahn-Teller system is calculated by using two different methods. The first is the classical method based on the configuration coordinate model (CCM), and the second is the numerical method based directly on the Heisenberg-Kramers formula. As far as the first order Raman scattering process is concerned, the two kinds of results agree well in the strong coupling limit. These results are also compared with the experiment on C6O62− ion with a satisfactory agreement.View full abstractDownload PDF (932K) -
Hiroshi Kojima, Naoto Kobayashi, Nobuhiro Maeda, Masakatsu Sakisaka1979 Volume 46 Issue 1 Pages 198-204
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe L- and M-shell Auger electrons from vapors of zinc and cadmium, respectively, excited by protons and alpha particles at 0.5–2.75 MeV in energy have been observed and compared with those by electron excitation. The simultaneous ionicities for the M-shell of zinc and the N-shell of cadmium are estimated from the shift-energies of Auger peaks, as 0.5 for protons and a few for alpha particles in average. Applying Rutherford scattering of projectiles and known ionizing collisions, the Auger yields are converted to the respective ionization cross sections, which fairly well agree with the theory of binary encounter approximation (BEA).View full abstractDownload PDF (916K) -
Swati Ray, A. K. Barua1979 Volume 46 Issue 1 Pages 205-207
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy using a high resolution molecular beam scattering apparatus the total cross sections of Na in collision with CO, NO, CO2, C2H2 and CH4 have been measured. All the necessary corrections to the experimental data have been applied. The experimental data have been compared with the theoretical values obtained by using Massey-Mohr expression and Slater-Kirkwood and London dispersion formulae for dispersion forces. It is seen that the agreement between the experimental and theoretical total cross sections is fairly good for the complicated collision partners like CO2, C2H2 and CH4.View full abstractDownload PDF (316K) -
Vibrational Excitation of H2, D2, N2 and O2 by Li+ Impact in the Energy Range from 100 eV to 1200 eVNobuo Kobayashi, Yoh Itoh, Yozaburo Kaneko1979 Volume 46 Issue 1 Pages 208-214
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCross sections for vibrational excitation of H2, D2, N2 and O2 by Li+ impact are measured with an ion energy-loss spectrometer. The cross sections are obtained from relative height of the loss peaks in a spectrum. The absolute cross sections are obtained above a few hundred eV. The maximum values of the measured cross sections for v=0→1 excitation of H2, D2, N2 and O2 are 7.5×10−18 cm2, 1.0×10−17 cm2, 3.3×10−18 cm2 and 1.6×10−17 cm2, respectively. For H2 and D2, v=0→2 excitation is observed, while, it does not appear for N2 and O2. The measured cross sections are compared with the first Born approximation assuming that the exctiation occurs only through polarization force. The contribution of the polarization force to the vibtational excitation of infrared active molecules is estimated.View full abstractDownload PDF (844K) -
Hiroshi Sato, Shunsuke Hara1979 Volume 46 Issue 1 Pages 215-220
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe radial and rotational coupling matrix elements between the 1Σg+(2sσ2, 2pσ2, 2pπ2), 1Πg(2pσ2pπ) and 1Δg(2pπ2) quasi-molecular states of He2++ have been calculated using an elaborate CI wave function in the range of internuclear separation from 0.0 to 0.5 atomic units. It is pointed out that, because of the configuration mixing, the rotational coupling matrix elements which are zero at the united atom limit or in the single configuration approximation have finite values at small R. The radial coupling matrix element between the 1Σg+(2sσ2) and 1Σg+(2pσ2) states is about 10 atomic units at the pseudo-crossing near R=0.2. The accuracy of the calculation of the radial coupling matrix elements is discussed.View full abstractDownload PDF (640K) -
Yoshifumi Harada1979 Volume 46 Issue 1 Pages 221-227
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUltrasonic attenuation of critical binary mixtures triethylamine-water has been measured over the frequencies 15–95 MHz and at temperatures 12.5–18.0°C. The total sound absorption Ψ(ε, ω) can be well expressed by three terms,
Ψ(ε, ω)=Ψcrit.(ε, ω)+Ψbg(ε, ω)+σ(T),
where ε=(Tc−T)⁄Tc is the reduced temperature, ω is the angular frequency of the sound. The first term is the critical relaxation, the second the background relaxation, and the last the classical contribution. The reduced absorption per wavelength (αλ)* vs the reduced frequency ω* follows the theoretical universal function over a wide range of ω*(=1×100∼3×103). From numerical analysis of Ψcrit.(ε, ω) based on the Kawasaki mode-mode coupling theory, the characteristic frequency of order-parameter fluctuations is expressed by fD(ε)=f0ε3ν with ν=0.65 and a relaxation parameter is written by Q(ε)=Q0ε−α with α=0.084 for ε>6×10−3 and α=0.49 for ε<6×10−3. Discussions are given on the validity of hyper scaling relation and of correlation functions in the binary system studied.View full abstractDownload PDF (932K) -
Hideo Sugai, Kazuo Ido, Susumu Takeda1979 Volume 46 Issue 1 Pages 228-234
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical study is made of the plasma heating by a coherent rf field localized in a plasma. This heating method is based on Fermi stochastic acceleration; the transit time acceleration occurs randomly when the rf period is much less than the time between two successive entries of the charged particles into the localized field. The initial heating rate is provided analytically, and the optimum design for the heating experiment is suggested. The time evolution of the velocity distribution function is demonstrated by numerical calculations. The bulk heating rather than the tail heating occurs for parameters which gives the best heating rate. The temperature exhibits an essentially linear time dependence, in contrast to the square time dependence predicted by Akhiezer and Bakai.View full abstractDownload PDF (852K) -
Hideo Sugai, Masanori Sato, Susumu Takeda1979 Volume 46 Issue 1 Pages 235-240
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA basic experiment is attempted on the transit time heating based on Fermi stochastic acceleration. Sharply localized rf field is externally generated in the vicinity of antenna immersed in a plasma. To avoid wave heating, the frequency ω has been selected in the wave evanescence regime (ωpe2>>ω2>ωce2), where ωpe and ωce are the electron plasma and the electron cyclotron frequencies, respectively. The efficient electron heating is observed with the electron temperature rise ΔTe⁄Te=2–7. The dependence of the heating time on various parameters is found to be consistent with theoretical predictions.View full abstractDownload PDF (760K) -
Satoshi Kasai, Akimasa Funahashi, Masayuki Nagami, Tatsuo Sugie, Toshi ...1979 Volume 46 Issue 1 Pages 241-249
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDetailed spectroscopic studies of impurities have been made on the hydrogen plasma in the wavelength region from 10 to 1300 Å with the upgraded DIVA tokamak device with a divertor. The toroidal field is 20 kG and the peak plasma current is 40 kA. Oxygen is the dominant impurity with the density of about 2% of the electron density. The effective ionic charge estimated from the amount of low-Z impurities (oxygen and carbon) is 2.4 to 3 in agreement with the value derived from the plasma conductivity. The emission spectrum of many lines observed in the region from 42 to 200 Å is due to gold as impurity. Its spatial distribution has a peaked profile at a shorter wavelength and a hollow profile at a longer wavelength. The radiation power losses due to low-Z impurities and gold are estimated to be 30–35 kW and 27 kW, respectively, and the total power loss corresponds to 41–44% of the Joule-input power.View full abstractDownload PDF (1188K) -
Tatsuo Sugie1979 Volume 46 Issue 1 Pages 250-257
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDoppler broadenings of impurity (O, N and C) lines in hydrogen discharges were observed with the JFT-2 and DIVA tokamak devices for the purpose of determining the spatial distribution of the ion temperature. A 1-meter Czerny-Turner type vacuum monochromator was used in higher orders for sufficient resolution. Impurity emissions are localized in shell-like regions in the minor cross-section. The radial distribution of the ion temperature was determined from the Doppler broadening of various impurity lines and from the localization of line intensities. The Doppler temperatures of the 0+6 ion were found to be 256 eV for a 100 kA, 14 kG discharge with JFT-2 and 220 eV for a 28 kA, 20 kG discharge with DIVA.View full abstractDownload PDF (944K) -
Hiroshi Naitou, Tetsuo Kamimura, John M. Dawson1979 Volume 46 Issue 1 Pages 258-265
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCross field heat and particle transport due to the thermally excited convective cell mode is investigated both by theoretical work and by particle simulations. It is shown that there is a parameter range where the heat diffusion coefficient DH is considerably less than the particle diffusion coefficient DP. This results from the fact that high energy particles in a velocity distribution diffuse much more slowly than the low energy particles because the fluctuating electric fields are averaged over their finite Larmor radii. The magnetic field scaling of DH⁄DP is also discussed. The results imply that ions in a thermonuclear reactor should be less affected by turbulence than are electrons as appears to be the case.View full abstractDownload PDF (1048K) -
Toshio Tange, Sanae Inoue, Kimitaka Itoh, Kyoji Nishikawa1979 Volume 46 Issue 1 Pages 266-276
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA general theory is presented for the transport fluxes across a magnetic field due to electromagnetic fluctuations. The transport coefficients are expressed in terms of the spectral functions or the correlation functions of the fluctuations under the assumption that the scale length of the inhomogeneity is large as compared with the ion Larmor radius. As a simple application of the formulas obtained, we investigate the finite-β effects on the diffusion and the heat fluxes of electrons due to the drift wave turbulence neglecting the effect of the magnetic shear. We find that these fluxes are reduced by the finite-β effect.View full abstractDownload PDF (1228K) -
Tomokazu Kato, Takashi Okazaki, Takashi Ohsawa1979 Volume 46 Issue 1 Pages 277-284
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe density oscillations in a system composed of a one-dimensional cold electron plasma and a cold electron beam are considered where the beam is assumed to be modulated sinusoidally and also to be bounded by a repeller in the plasma. A nonlinear differential equation which describes the density oscillations in the beam-plasma system is derived from the Vlasov and Poisson equations. The equation does not take the so-called van der Pol-type, but is, as one of the linear approximations, reduced to a Mathieu-type equation with an inhomogeneous term:
d2ρ⁄dt2+ωe2[1−σ cos (ωt)]ρ=σ(ω2−ωe2) cos (ωt).
This inhomogeneous Mathieu equation is analyzed by the method of Bogoliubov and Mitropolsky. The spectrum of the characteristic frequency obtained from the analysis is compared with the experimental results.View full abstractDownload PDF (856K) -
Seishiro Hashiguchi, Masaaki Inutake1979 Volume 46 Issue 1 Pages 285-292
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA high density and high pressure plasma was produced behind a reflected shock wave. Test gases are argon, krypton, and xenon. The temperature and the pressure were experimentally determined. The electron density was calculated from the measured temperature and pressure and it ranges from 1018/cc to 1019/cc. The xenon and the krypton plasmas were black body radiators in the visible region. The temperature is close to the Rankine-Hugoniot value for argon plasma but it is below the R-H value for krypton and xenon. The temperature is relatively low (10000 K–16000 K) so that the “plasma parameter” is larger than 1. The maximum value of it is 7.View full abstractDownload PDF (1052K) -
Haruyuki Irié, Toshio Tange, Kyoji Nishikawa1979 Volume 46 Issue 1 Pages 293-299
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of toroidal geometry on the particle diffusion of a turbulent plasma are considered. Using the fluid-like equations obtained by appropriate average of the Klimontovich equation, we derived a formula for the diffusion flux across magnetic surface. The formula is applicable to both turbulent and quiescent plasmas, and reproduces the Pfirsch-Schlüter diffusion in the latter case. The geometrical effect on the turbulent diffusion is found to become substantial when the ratio of the antisymmetric to symmetric part (with respect to the wavenumber parallel to the magnetic field) of the dissipative part of the susceptibility exceeds some critical value. As a specific example, we treat the case of drift wave turbulence. It is shown that the geometrical effect is insignificant unless the perpendicular wavelength is sufficiently large as compared with the ion Larmor radius.View full abstractDownload PDF (948K) -
Vijay K. Garg1979 Volume 46 Issue 1 Pages 300-302
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple analytical solution to the problem of flow development in a parallel-plate channel is presented. It is based on the application of integral momentum or integral-mechanical energy equation in the entrance region. Results are found to be in good agreement with Schlichting’s solution, but like Schlichting’s solution the present solution is not valid in the immediate vicinity of the entrance plane.View full abstractDownload PDF (272K) -
Yoshimoto Onishi1979 Volume 46 Issue 1 Pages 303-309
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEvaporation and Condensation of a vapor gas over a plane interphase surface of its condensed phase are investigated analytically on the basis of the nonlinear Boltzmann-Krook-Welander equation and the diffuse reflection boundary condition.
The distributions of temperature and pressure as well as the mass flux are explicitly obtained.View full abstractDownload PDF (684K) -
Ko Tamada1979 Volume 46 Issue 1 Pages 310-311
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn exact solution of the Navier-Stokes equation is given which represents steady two-dimensional stagnation-point flow of a viscous fluid impinging on a plane wall obliquely. Numerical discussions of the relevant functions as well as the structure of the flow field are made. A comparison with an existing approximate theory is also given.View full abstractDownload PDF (180K) -
Ryogo Hirota1979 Volume 46 Issue 1 Pages 312-319
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDifference analogues of the nonlinear partial differential equations that can be transformed into the linear equations are obtained, and exact solutions to the difference equations are presented. The nonlinear differential equations concerned are Liouville’s equation, Two-Wave interaction, the Riccati equation and the Burgers equation.View full abstractDownload PDF (568K) -
Masaru Shinohara, Hidenori Hashimoto1979 Volume 46 Issue 1 Pages 320-327
Published: January 15, 1979
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical study is made of the lateral force on a spherical rigid particle sedimenting with a constant velocity in an incompressible viscous fluid bounded by a vertical cylindrical wall. Results are obtained up to the first-order effects of boundaries using the method of matched asymptotic expansions. The sphere experiences a lateral force towards the axis everywhere and its magnitude is proportional to the distance from the axis to the position of the sphere when the distance is not so large and has a maximum value near the wall.View full abstractDownload PDF (692K) -
Yoichi Hanayama1979 Volume 46 Issue 1 Pages 328-333
Published: January 15, 1979
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSVelocity of ultrasound waves in a mixed gas of helium and argon have been measured at 25°C under high pressure up to 20 KB, and in mixture of helium and xenon up to 5 KB. In the latter case, separation of the gas phase has been observed, but not in the former case. Pressure of the phase separation measured from sound velocity are in very good agreement with the previous data obtained from visual observation. Reaction rate of phase separation of the mixed gas is also discussed.View full abstractDownload PDF (708K)