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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
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Volume 45, Issue 1
Displaying 1-50 of 60 articles from this issue
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Ichiro Arai, Hirofumi Fujii, Saburo Homma, Yoshimoto Hoshi, Hirokazu I ...1978 Volume 45 Issue 1 Pages 1-6
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe cross section of the photoproduction of pions from carbon at 41° in the laboratory system and in the incident energy region from 510 MeV to 750 MeV is measured by a magnetic spectrometer for pions and counter hodoscopes for recoil protons in coincidence with pions. A tagged photon beam is used. The results which show the production of pions from the quasi free nucleons inside the nucleus are analyzed in terms of the distorted wave impulse approximation.View full abstractDownload PDF (684K) -
H. M. Agrawal1978 Volume 45 Issue 1 Pages 7-13
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSE2-transition probabilities between 4g+→2g+, 2g+→0g+ and 2γ+→0g+ in even-even deformed nuclei of rare earth and actinide regions have been estimated using the asymmetric rotor model of Davydov and Rostovsky. The predictions of this model have been compared with the experimental values. From this comparison it has been found that the DR estimates are quite close to the experimental rates. The variations of the ratios B(E2, 4g+→2g+)exp/B(E2, 4g+→2g+)DR, B(E2, 2g+→0g+)exp/B(E2, 2g+→0g+)DR, B(E2, 2γ+→0g+)exp/B(E2, 2γ+→0g+)DR and B(E2, 2g+→0g+)exp/B(E2, 2g+→0g+)SP with non-axiality parameter ‘γ0’ have been studied.View full abstractDownload PDF (560K) -
Yukio Osaka1978 Volume 45 Issue 1 Pages 14-21
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLife time of piezoelectric polaron at finite temperature is calculated with the aid of the method of functional averaging. An infrared divergence in perturbation theory is eliminated.View full abstractDownload PDF (560K) -
Masatoshi Shiino, Takasu Hashimoto1978 Volume 45 Issue 1 Pages 22-28
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have measured both real and imaginary part of magnetic susceptibility of EuS near the Curie temperature Tc by means of the high frequency magnetic susceptibility measurement method, in which no demagnetization corrections have been required. Except for the immediate vicinity of Tc, the critical relaxation spectra obtained are described by a Debye form of relaxation and the critical index of the relaxation time is determined to be Δ=1.26±0.03. The value of Δ is slightly smaller than that of the static susceptibility, γ=1.41±0.01. For temperatures closer to Tc, the critical relaxation spectra become to exhibit a polydispersive character.View full abstractDownload PDF (936K) -
Ryosuke Yokota1978 Volume 45 Issue 1 Pages 29-41
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe interaction distance R in 80B2O3·15PbO·5Al2O3 glass and 0.132Na2O·0.868SiO2 glass is obtained as 15.8 Å which satisfies R>>r0 (r0: nearest neighbor distance). The parameter f0 of Langer’s scaling analysis is obtained to be very large for these glasses. Therefore, the linearized Cahn theory holds for the early stages.The relaxation of ∂2f⁄∂c2 besides \ ildeD is introduced to take place during aging the severely quenched glass. The theory taking into consideration of thermal fluctuations and the relaxation of ∂2f⁄∂c2 and \ ildeD is developed.
In the above two glasses with the very different thermal history each other, time evolution kinetics in SAXS spectra can be elucidated by this theory. Cahn-Cook’s amplification factor spectra after the termination of all the relaxation processes show the typical characteristics of the early stage of the decomposition.View full abstractDownload PDF (1504K) -
Atsushi Ichimura, Nobuhiko Saitô1978 Volume 45 Issue 1 Pages 42-49
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSComputer calculations on a classical dynamical system of two degrees of freedom with the hamiltonian,
(Remark: Graphics omitted.)
are presented. The Poincaré mapping on (q2, p2) plane of this system around ε=0.5 revealed that there exist several ergodic components in the stochastic region, and furthermore they have a hierarchy structure. The Lyapunov characteristic numbers are also shown to have different values for different ergodic components.View full abstractDownload PDF (688K) -
Kentaro Onabe, Michio Naito, Shoji Tanaka1978 Volume 45 Issue 1 Pages 50-58
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature and angular dependences of upper critical field Hc2 in layered superconductor 2H–NbS2 have been investigated. Parallel-to-perpendicular critical field ratio was found to be 7.5∼8.1 in the experimental temperature range of T=4.9∼5.8 K. The experimental results were found to be well described by 3-dimensional model for anisotropic superconductors. This value is much larger than 2.3∼3.2 found in 2H–NbSe2. It is suggested that absence of CDW in 2H–NbS2 keeps anisotropy of the Fermi surface high down to low temperatures and this is responsible for the large anisotropy or the upper critical field in this material.View full abstractDownload PDF (1160K) -
Norio Ohta, Taiichiro Ohtsuka1978 Volume 45 Issue 1 Pages 59-66
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anisotropy of the lower critical field Hc1 has been measured in single crystal spheres of niobium (Nb) and vanadium (V). Analysis of the magnetization curves near Hc1 indicates that the transition at Hc1 is made into the intermediate mixed state characteristic of small κ (Ginzburg-Landau parameter) Type II superconductors. The anisotropy curve of Hc1 determined with the field lying in the (1\bar10) plane is similar for Nb and V and shows an unexpectedly complicated pattern. It is argued that the observed anisotropy curve is of intrinsic nature and may possibly be correlated with the anisotropy of the flux line lattice state.View full abstractDownload PDF (1184K) -
Yasaburo Yokozawa, Mitsuho Tanimoto, Hideo Takano1978 Volume 45 Issue 1 Pages 67-72
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe measurements at room temperature showed the minimum of linewidths at a “magic angle” θ=55° and the change of line shapes with decreasing Mn content, where θ is the angle between an external magnetic field and the c axis of the crystal. These facts were explained by the dominancy of q=0 mode in the dipolar interaction and the change of spin correlations from two- to one-dimensional character.
In the samples of concentration c>cp, where cp is a percolation concentration, the minimum of the linewidths at the magic angle disappeared in low temperatures and the resonances disappeared at Néel temperature. In the samples of c<cp, the minimum at the magic angle did not disappeared and the resonances were observed inspite of sharp broadening at the lowest temperature that could be reached.View full abstractDownload PDF (684K) -
Yutaka Nakai, Kazuo Hozaki, Nobuhiko Kunitomi1978 Volume 45 Issue 1 Pages 73-79
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe properties of the magnetic moments of Mn atoms in ferromagnetic fcc Co–Mn alloys were investigated by means of neutron magnetic diffuse scattering and by the measurement of the anisotropy of the electrical resistivity under the magnetic field. By comparing the cross-sections between polarized and unpolarized neutrons, it has been suggested that there are two kinds of Mn atoms; the one with parallel and the other with antiparallel moment to the bulk magnetization. The concentration dependence of the number of Mn atoms with parallel moment has been estimated by the resistance experiment, based on the two current model. These facts can be explained by a spin reversal model with some improvements.View full abstractDownload PDF (876K) -
Shunichi Kawanishi, Akira Tasaki, Kiiti Siratori1978 Volume 45 Issue 1 Pages 80-83
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic susceptibility was measured along the screw axis of single crystals of ZnCr2Se4, a proper screw magnet, below the Néel temperature. A pronounced temperature dependence was observed and was discussed in connection with the tetragonal deformation of the crystal. Structure sensitiveness of the magnetic properties of this material was also reported.View full abstractDownload PDF (500K) -
Seishi Takagi, Kazuo Kawabe1978 Volume 45 Issue 1 Pages 84-88
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn the wide temperature range of 77–360 K, the angular dependence of the ESR linewidth, ΔH, in the single crystals of organic ion-radical salts, 3,3′-diethyl-6,6′-dimethyl-2,2′-thiacyanine-[TCNQ]2 and 1-ethyl-3′-methyl-2,2′-quinoselenacyanine-[TCNQ]2, can be described well by an expression, ΔH(θ)=α(3cos2θ−1)2+βsin4θ, where α and β are temperature-dependent parameters and θ is the angle between the axis perpendicular to the crystal planes of the plate-like single crystals of the salts and the direction of applied magnetic field. However, the two salts differ in the temperature dependence of the ESR linewidth. The difference may result from the difference of the structural symmetry of the cations.View full abstractDownload PDF (580K) -
Ayao Okiji, Hideaki Kasai, Toshijiro Tanaka1978 Volume 45 Issue 1 Pages 89-93
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt has been reported by D. Paquette et al. that 55Mn nuclear spin-lattice relaxation (NSLR) rates in MnF2 exhibit criticallike divergent behaviour as the external field approaches HSF, the spin-flop field. The theoretical estimation for this phenomenon has been made by using the formalism of the nuclear magnon introduced by Ninio and Keffer. Quantitative agreement between experiment and theory is obtained.View full abstractDownload PDF (604K) -
Takahito Kaneyoshi1978 Volume 45 Issue 1 Pages 94-98
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe paramagnetic Curie temperature of an amorphous magnetic metal with the indirect exchange interaction which is severely different from the standard R–K–K–Y interaction, especially for a system with the Fermi energy near the mobility edge, is studied.View full abstractDownload PDF (500K) -
Junji Ishida, Shoji Ishida, Setsuro Asano1978 Volume 45 Issue 1 Pages 99-104
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic form factor of the ferromagnetic ordered alloy Fe3Al has been calculated based on the electronic structure obtained by the symmetrized augmented plane wave method. The agreement between the calculated and the experimental values is satisfactory. The average fraction of 3d electrons around the iron atom with dε symmetry is 62.5% and that with dγ symmetry is 37.5%. Thus the magnetic electron density is not spherically symmetric around the nucleus. The difference of the observed magnetic form factors for different indices but with the same scattering angles can be explained by this small asphericity of the distribution of magnetic electrons.View full abstractDownload PDF (584K) -
Hatsuo Tange, Toshihiko Tokunaga, Mitita Goto1978 Volume 45 Issue 1 Pages 105-109
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMeasurements were made of the magnetic moment of disordered Ni–Mn alloys containing up to 24 at%Mn in the temperature range from 77 K to Curie temperature. The spontaneous magnetic moment at 0 K and the Curie temperature deduced by means of Arrott plot were presented. The magnetic moment increases linearly with increasing Mn content and decreases rapidly to zero at about Ni3Mn. This behavior is discussed in terms of Kouvel’s atomistic model. The Curie temperature monotonically decreases to zero near Ni3Mn with increasing Mn content and that is discussed in terms of a pair-interaction model and Kouvel’s molecular field model. It is found with the pair-interaction model that Ni–Ni and Ni–Mn pair interactions are positive and Mn–Mn is negative, but with Kouvel’s model that the interaction parameters have no real solution.View full abstractDownload PDF (652K) -
Katsuma Yagasaki, Yasuharu Hidaka, Hironobu Fujii, Tetsuhiko Okamoto1978 Volume 45 Issue 1 Pages 110-114
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSChange in the Néel temperature and the Curie temperature of the compound system GdAg1−xInx with hydrostatic pressure has been measured up to 6 kbar by means of a standard Hartshorn bridge circuit. The Néel temperature does not change with pressure within an experimental error. The Curie temperature shifts to the higher temperature with increasing pressure. The value of pressure derivative ΔTC⁄Δp increases with increasing x. The results obtained are discussed on the basis of the indirect exchange theory.View full abstractDownload PDF (612K) -
Toshinobu Tsuda, Hiroshi Yasuoka1978 Volume 45 Issue 1 Pages 115-121
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe properties of the 59Co NMR in a single crystal of KCoF3 were studied by a transient NMR technique at low temperatures. The observed spectrum is composed of seven distinct lines split by the nuclear-quadrupole interaction. The frequency of the central (±1⁄2↔±1⁄2) transition extrapolates to 372.7±0.05 MHz at 0 K, corresponding to the hyperfine field of 370.7±0.05 kOe. The line separations were not equal having the average value of 2.1±0.5 MHz. The hyperfine field and the quadrupole interaction agree with the calculated values based on the Co2+ ground state wave function. A large shift as much as 34% was observed for the nuclear g-factor, which is expected mainly from the residual orbital moment of the Co2+ ions. It was also found that external fields above 35 kOe along one of the c-axis make all the domains in the antiferromagnetic state to be perpendicular to the field.View full abstractDownload PDF (976K) -
Takahiko Tamaki, Kuniro Tsushima1978 Volume 45 Issue 1 Pages 122-127
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA time varying macroscopic magnetization of ruby is observed at room temperature by selectively exciting the Cr3+ ions with a right- and a left circularly polarized light of a Q-switched ruby laser from one of the ground 4A2 multiplets to a proper component of the upper \barE(2E) multiplets. Dependence of such a magnetization in the Z-direction on the irradiation power, the ellipticity and the magnetic field was measured with a pick-up coil. The signal had a value of 1.7×10−4 emu/g at the irradiation of 67 mJ. The relaxation time of the ground state was estimated from the decay to be about 180 ns in zero magnetic field. The signal changed with the ellipticity of the exciting light, and the amplitude of the signal was always proportional to the intensity of the excitation. These experimental results were quantitatively explained by a theoretical analysis for the time varying optically induced magnetization.View full abstractDownload PDF (748K) -
O. P. Gupta, M. P. Hemkar1978 Volume 45 Issue 1 Pages 128-132
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA lattice dynamical model for the study of fcc metals is proposed. The model considers short range pairwise forces effective upto second neighbours and volume forces on the lines of Bhatia in improved form. The model describes the ionic lattice to be in equilibrium in a medium of electrons. As an application, phonon spectra for lead are computed and results are discussed.View full abstractDownload PDF (508K) -
Shigeru Tanaka, Koichi Mizushima, Shuichi Iida1978 Volume 45 Issue 1 Pages 133-136
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe spin lattice relaxation time and the EPR parameters g, D and E of Mn4+ and Cr3+ in rutile have been measured from 78 K up to 470 K. They show a stronger temperature dependence for Mn4+ than for Cr3+, being against the conventional theoretical predictions. We presume that it comes from the difference in the bonding character of these ions. It is expected that the closer location of the energy levels of the empty orbitals of Mn4+ is favorable for the force constant between Mn4+ and O2− to become smaller than that between Cr3+ and O2−.View full abstractDownload PDF (392K) -
Daijiro Yoshioka, Hidetoshi Fukuyama1978 Volume 45 Issue 1 Pages 137-147
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGround states are investigated of a two dimensional electron-hole system in a magnetic field where electrons and holes move on parallel planes which are spatially separated. Especially a crystalline state of dipoles or a dipole-density-wave (DDW) state is considered. Such states are found to be stabilized by a magnetic field, since it is shown that the field increases the effective mass of a dipole. A phase diagram in the plane of density and magnetic field is obtained.View full abstractDownload PDF (1088K) -
Mikihiko Ikezawa, Takao Nanba1978 Volume 45 Issue 1 Pages 148-152
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOptical absorption spectra of Ge crystals have been measured in the far-infrared region at temperatures between 2 and 292 K. In the low energy region, structures in the absorption spectra have been found around 100 and 200 cm−1, which are assigned as being due to the two-phonon difference processes between TA and other phonons. The absorption spectrum due to the two-phonon difference process gives us information on the optical absorption process which is complementary to the information obtained from the two-phonon summation spectrum.View full abstractDownload PDF (628K) -
Shin-ichi Uchida, Shoji Tanaka1978 Volume 45 Issue 1 Pages 153-161
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSReflection spectra have been measured in the far infrared region (10 cm−1–500 cm−1) for several kinds of crystals of transition-metal dichalcogenides (TX2). Optical phonon frequencies of infrared active mode (E⊥c) are determined for the group IV compounds HfSe2, ZrSe2 and TiSe2 and for the group VI compounds MoS2, MoSe2, WS2 and WSe2. Using available Raman data the localized effective charges (el*) of these materials are estimated. The nature of the bonding in TX2 is found to be well described in terms of the estimated el* rather than by the macroscopic effective charge eT*.View full abstractDownload PDF (1080K) -
Masaki Maeda, Takuro Ikeda1978 Volume 45 Issue 1 Pages 162-168
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElastic measurements have been made on mixed crystals of rochelle salt and ammonium rochelle salt, Na[K1−x(NH4)x]C4H4O6·4H2O, by the piezoelectric resonance method. The temperature dependence of elastic compliance was found to be very similar to that of dielectric constant in the mixed crystal with any composition. A phenomenological theory was developed on the basis of two-sublattice model to explain the dielectric and elastic behavior in mixed crystals assuming the concentration dependence of parameters.View full abstractDownload PDF (684K) -
Masao Kamada, Riso Kato1978 Volume 45 Issue 1 Pages 169-174
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAbsorption spectra of NaNO2 associated with the electronic transition 1A1→3B1 in NO2− have been measured for the E⁄⁄a, b and c polarizations. The E⁄⁄b and E⁄⁄c spectra show the series of vibronic lines accompanied with the phonon side bands, while the E⁄⁄a absorption is too weak to be observed. The selection rules are discussed for the modes of phonons which interact with the triplet exciton to give rise to the phonon side band of each polarization. The assignments are given to the prominent peaks and shoulders in the side bands of the E⁄⁄b and E⁄⁄c spectra. Two extra series of weak satellite bands have been found on the low energy tails of the vibronic lines and they are interpreted as the lines due to the isotopic species N14O16O18− and N15O216−.View full abstractDownload PDF (744K) -
Yasuhiko Fujii, Sadao Hoshino, Takashi Sakuma1978 Volume 45 Issue 1 Pages 175-181
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIncoherent neutron scattering from protons in HCl has been measured mainly in Phase I with the disordered structure of molecular orientation. The observed energy spectra of neutrons are well interpreted by a reorientational jump model in which a molecule makes reorientation among twelve ⟨110⟩ directions through the 60° and 90° flipping processes. The residence time τ between successive jumps obtained by the model-fit obeys the relation τ=τ0exp(E⁄kBT) with τ0=1.07×10−12 sec. and E=0.372 kcal/mol. in the higher-temperature region in Phase I. The value of τ was compared with the correlation time for molecular reorientation obtained by NMR method.View full abstractDownload PDF (856K) -
Kazu Nishigaki1978 Volume 45 Issue 1 Pages 182-190
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe sound attenuation (1∼9 MHz) and velocity in the critical mixture, n-heptane-nitrobenzene, have been measured in detail through the critical mixing temperature at 1 atm by the pulsed technique which incorporates the pulse-echo-overlap method and signal-averaging. Temperature and frequency dependence of the critical attenuation per wavelength αλ(crit.) and dispersion have been examined in terms of the mode coupling theory by Fixman and Kawasaki. The results support the analogy of sound propagation in the critical fluid states of gas-liquid and liquid-liquid. Possible behavior of the zero-frequency sound speed c0 is also discussed.View full abstractDownload PDF (1168K) -
G. Vázquez Polo, C. Ruíz Mejía1978 Volume 45 Issue 1 Pages 191-194
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSK band of FA center is studied theoretically applying a perturbation method. Within the semicontinuum theory, the wave functions and their corresponding energies for KCl F center are calculated using the Simpson and Krumhansl-Schwartz method. We obtain analytic expressions for the potentials of Li+ and Na+ ions. Applying an artifice, the perturbation was taken as the difference of potential of the impurity ion and the K+ ion potential, while the problem Hψ=Eψ for F center was solved within the semicontinuum theory. Also the calculations for the transitions between the 1S and 2P states were made using the Simpson and Krumhansl functions and also the ones of Gourary-Adrian type I. We suggest an experiment to be made.View full abstractDownload PDF (444K) -
Kenji Miyakawa, Shin Akahoshi1978 Volume 45 Issue 1 Pages 195-199
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn nematic liquid crystals subject to a sinusoidal electric field, critical behaviors of fluctuations in the transition from equilibrium to chevron texture states are studied by using photon correlation method. Oscillatory fluctuations with one half of the period of the applied field are found to be strongly enhanced and become undamped as a threshold is approached. On the other hand, the thermally excited twist mode is also found to take no part in this transition. Thus the present system seems to have a possibility of a hard mode instability, unlike the case of the Williams domain with a soft mode instability.View full abstractDownload PDF (600K) -
Tsuyoshi Yamaguchi, Yoshihiro Miwa1978 Volume 45 Issue 1 Pages 200-205
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe exact calculation of multiplet structure arising from the interaction of d-electrons with a p-hole created in both the 2p- and 3p-shell X-ray photoemission spectroscopy and the high-resolution spectroscopy of the X-ray Kα- and Kβ-emission of titanium and vanadium compounds is presented.View full abstractDownload PDF (584K) -
Atsushi Okazaki, Michihiro Ono1978 Volume 45 Issue 1 Pages 206-211
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA method is proposed for determining volume ratios of domains in a poly-domain specimen of perovskite crystals with the space group I4⁄mcm; the ratios are fundamental parameters in determining the crystal structure. The method is based on measuring relative intensities of triplets of Bragg reflexions with special indices and is applied to structure determinations of SrTiO3 and KMnF3. A discussion is given of refinement of the structure; a difficulty in a least squares calculation owing to a correlation between structural parameters is emphasized. The use of accurate lattice-constant data together with a conventional structure analysis is recommended.View full abstractDownload PDF (880K) -
N. R. Lokhande, A. R. Chetal1978 Volume 45 Issue 1 Pages 212-215
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe extended fine structure associated with the K-absorption discontinuity of copper in pure metal and in the alloy Cu82.5Sb17.5 is studied using a 40 cm Cauchois type bent crystal X-ray spectrograph. The extended fine structure has been explained on the basis of the theory proposed by Lytle, Sayers and Stern. The theory has also been used to determine the bond length for the alloy. Levy’s method has also been used to determine bond lengths for the systems under study. The results obtained from both the theories have been compared.View full abstractDownload PDF (408K) -
Kunizo Onda1978 Volume 45 Issue 1 Pages 216-224
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA variable amplitude method developed within nonrelativistic quantum mechanics is applied to scatterings of charged particles with a screened Coulomb potential in a uniform magnetic field. Transmission and reflection coefficients in a case of electron scattering are calculated for transitions from the Landau orbital specified by quantum numbers n and m to the one specified by those n′ and m in the range of incident energy along the magnetic field from 1 to 104 eV and in that of the magnetic field from 108 to 1012 Gauss. Results are compared with those obtained by a Born-like approximation and the applicability of the latter method to this problem is discussed.View full abstractDownload PDF (916K) -
Shinobu Nakazaki1978 Volume 45 Issue 1 Pages 225-229
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAll the radial integrals required in the Coulomb-Born calculation of the excitation of positive ions by electron impact have been expressed in terms of the Gauss hypergeometric functions for the monopole and dipole cases when the atomic radial functions are represented analytically as a linear combination of Slater-type orbitals. The cross sections for the 1s→2s and 1s→2p transitions in hydrogen-like ions with Z=2∼10 and 50 have been obtained. The present results are in agreement with others which have been evaluated numerically.View full abstractDownload PDF (460K) -
Keishi Ishii, Michio Tomita1978 Volume 45 Issue 1 Pages 230-235
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLifetimes of six doubly excited states in He were measured by means of the beam-foil technique. One of them is a new data, and the others are compared with the previous beam-foil data and the theoretical calculations. The reduction of experimental error was achieved by designing the well reproducible foil-drive mechanism and by applying the deconvolution procedure to the data treatment. The beam velocity after passage through the foil was determined by observing the zero field quantum beat with the accurately known fine structure separation.View full abstractDownload PDF (700K) -
Katsuyuki Nakano, Tohru Sugimoto, Hideo Suzuki1978 Volume 45 Issue 1 Pages 236-243
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe optical absorption of 3-methyl lumiflavin in solution is examined within the framework of π-electron approximation, according to our previous formulation of LCAO–ASMO–SCF–CI calculation.
It is thus found that the absorption spectrum of 3-methyl lumiflavin observed in benzene can be reproduced only when the screening of two-center Coulomb repulsion integrals is taken into account for all the pairs of atoms except bonded ones. It is also found that the absorption spectra observed in ethanol or water can be explained by the model interacting with (i) two point-dipoles or (ii) a point-dipole and a point-charge, although the model (ii) is higher in ground-state energy than the model (i) by amount of 3.64 or 5.24 eV in the case of ethanol or water, respectively.View full abstractDownload PDF (988K) -
Toshihiko Ohno, Takayoshi Okuda, Jun Yamada1978 Volume 45 Issue 1 Pages 244-246
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe probabilities of the two-photon ionization of cesium atoms by ruby laser light from 6p1⁄2, 6p3⁄2, 5d3⁄2 and 5d5⁄2 excited states were calculated. The densities of the excited atoms in the cesium discharge tube were estimated from the measured density and temperature of electrons. The calculated increases of the electron density show good agreement with the experimental results.View full abstractDownload PDF (288K) -
Mitsusuke Ikeda1978 Volume 45 Issue 1 Pages 247-251
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhotoinjection currents from gold into poly (N-vinylcarbazole) were measured. The electric field and temperature dependence of the injection current are analyzed on the basis of Blossey’s photoinjection model developed for metal-low mobility insulator systems, taking the mean free path x0 of the injected hot holes as a parameter. The barrier height is estimated to be 1.10 eV from the linear extrapolation of the plot of x02 as a function of photon energy.View full abstractDownload PDF (628K) -
Takao Ichimura, Naofumi Ogita, Akira Ueda1978 Volume 45 Issue 1 Pages 252-259
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe high-density fluid states of the soft core system are analysed in terms of fluctuating free volumes which are defined with use of atomic configurations simulated by a molecular dynamics method. Statistical properties of fluctuating free volumes are examined. They can be classified into extensive and intensive types. The fraction of intensive free volumes increases rather rapidly above ρ*\simeq0.7, where ρ* is defined by ρ(ε⁄kT)1⁄4 and ρ=Nσ3⁄V. This fact is well correlated with the dynamic as well as the static features of the system found previously. The Helmholtz free energy is derived in terms of mean free volumes under Singer’s assumption. It is in a good agreement with the result obtained by computer experiments, but the difference between them is systematic. It is overestimated for stable fluid states, and underestimated for metastable supercooled fluid states.View full abstractDownload PDF (944K) -
Masaaki Watanabe1978 Volume 45 Issue 1 Pages 260-268
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWhistler wave solitons generated by nonlinear self-modulations of high frequency whistler waves propagating along the static magnetic filed are investigated. Various descriptions for these whistler wave solitons are classified according to the relations among various smallness parameters and the existence conditions of different types of solitons are derived. The dynamic behavior of nonsteady whistler wave solitons is also discussed in terms of the trajectory in the parameter space.View full abstractDownload PDF (828K) -
Hiroatsu Maki, Keishiro Niu1978 Volume 45 Issue 1 Pages 269-275
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe enhancement of resonance absorption in a laser-irradiated target plasma is ascertained by a numerical integration method for the fixed density profile which has a density plateau in front of the steep density gradient at the critical surface. It is shown that the interference between the laser light and the plasma wave excited near the critical surface in the target plasma plays an essential role in the enhancement of absorption. Conditions for enhancement are derived analytically with respect to the density gradient in the resonance region and the number density of plateau formed at the target surface. The results suggest that large absorption rates are retained during the laser irradiation to the target whose density profile is being modified.View full abstractDownload PDF (772K) -
Shinsuke Watanabe1978 Volume 45 Issue 1 Pages 276-282
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPropagation of a soliton and generation of a tail by the soliton are investigated analytically and numerically for Korteweg-de Vries equation with dissipation term. The analytical solution obtained by the modified conservation laws shows that the amplitude and velocity of a soliton change in time due to the dissipation. At the same time, a non-soliton part—a tail—appears in the solution. The structure of a tail depends on the dissipation term. Numerical solutions confirm qualitatively the validity of the analytical solution. An overtaking collision of two solitons is also examined numerically.View full abstractDownload PDF (720K) -
Masaji Fukuda1978 Volume 45 Issue 1 Pages 283-288
Published: July 15, 1978
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe radial profile of DC toroidal current driven by an RF travelling field is studied experimentally in a magnetized plasma, in connection with the radial profile of RF field. As the toroidal magnetic field increases, the RF field \ ildeBz penetrates the plasma and becomes bell-shaped profile, while the DC current has a hollow structure. The hollow type structure of induced current is interpreted on the basis of force balance between the electromotive force due to RF travelling field and the frictional force due to collisions, where the former is proportional to the absorbed RF power.View full abstractDownload PDF (704K) -
Akihiko Iwahashi, Isao Ochiai, Hiroshi Toyama1978 Volume 45 Issue 1 Pages 289-291
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPlasma current density profile in a noncircular tokamak TNT is obtained from the direct measurements of the poloidal magnetic field. Magnetic probes are inserted to measure the poloidal magnetic field in the plasma in a low current operation. The elongation ratio ε estimated from these measurements is about 1.8 at the current peak and decreases with time due to the current peaking.View full abstractDownload PDF (312K) -
Kunio Kuwahara1978 Volume 45 Issue 1 Pages 292-297
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo-dimensional vortex shedding behind a circular cylinder is simulated by a point vortex array separating from the boundary layer. The flow round the body is impulsively started from rest. The boundary layer is divided into partitions and each of them is replaced by a point vortex with the same circulation as the corresponding partition. This point vortex array separates from the surface of the cylinder, forming Kármán’s type wake. The calculated drag coefficients have a peak initially and decrease gradually to the value of about 0.6 and begin to oscillate around the value between 0.6 and 0.8. The lift also begins to oscillate more clearly than the drag. The results are in good agreement with those obtained by much more elaborate finite-difference methods.View full abstractDownload PDF (544K) -
Yuji Kodama, Tosiya Taniuti1978 Volume 45 Issue 1 Pages 298-310
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe higher order approximations in the reductive perturbation method are studied for the weakly dispersive nonlinear system. It is shown that the secular terms appearing in the high order terms are eliminated by adding to the Korteweg-de Vries equation the derivatives of the higher-order conserved densities, the physical effects of which are given by the renormalization of the velocities of the KdV solitons.View full abstractDownload PDF (1272K) -
Yuji Kodama1978 Volume 45 Issue 1 Pages 311-314
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor the strongly dispersive nonlinear system, the higher-order effects in the reductive perturbation method proposed by Taniuti et al. are investigated. It is shown that the secular terms appearing in the higher-order terms are eliminated by adding to the nonlinear Schrödinger equation the functional derivatives of the higher-order conserved quantities, the physical effects of which are given by the renormalization of the frequencies and the velocities of the envelope solitons.View full abstractDownload PDF (348K) -
Yoshio Sone1978 Volume 45 Issue 1 Pages 315-320
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe behavior of a one-component gas bounded by an infinite plane surface of its condensed phase at a given temperature is studied analytically on the basis of the Boltzmann-Krook-Welander equation. The source of the qualitative disagreement between the existing results by the linear analysis and those of the non-linear numerical approach is clarified, and a system of successive approximation is given.View full abstractDownload PDF (536K) -
Ryogo Hirota1978 Volume 45 Issue 1 Pages 321-332
Published: July 15, 1978
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA Bäcklund transformation in the bilinear form is presented for the discrete-time Toda equation. The Bäcklund transformation generates a class of nonlinear partial difference equations that exhibits solitons.View full abstractDownload PDF (896K)