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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 35, Issue 1
Displaying 1-50 of 67 articles from this issue
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Teijiro Saito1973 Volume 35 Issue 1 Pages 1-7
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe bremsstrahlung beam from a 5 MeV electron linear accelerator was used to excite and study low-lying levels in 6Li, 11B and 27Al. A self-absorption method was used to find the widths Γ of these levels. The following level widths are obtained: Γ=(6.5−1.7+2.4) eV for the 3.56 MeV level in 6Li;Γ=(0.23±0.09) eV for the 2.12 MeV level, and Γ=(0.53±0.21) eV for the 4.44 MeV level in 11B. For the 2.98 MeV level in 27Al, the level width is found to be Γ=(0.10±0.04) eV assuming that the lower energy member of the doublet at 3 MeV is excited.View full abstractDownload PDF (740K) -
M. Sriramachandra Murty, K. Siddappa, J. Rama Rao1973 Volume 35 Issue 1 Pages 8-11
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRadiative neutron capture cross sections for the isotopes 59Co, 68Zn, 86Sr, 87Rb, 96Ru, 98Mo, 100Mo, 102Ru, 104Ru, 113In, 115In, 122Sn and 133Cs have been remeasured at the neutron energy 24±5 keV in view of the wide discrepancies in their values as reported in literature. The activation method and 4π geometry absolute gamma counting technique have been used to obtain the cross sections. By making a critical comparison of the present results with the earlier experimental values on the one hand and with semi-theoretical estimates on the other, an attempt is made to resolve the discrepancies.View full abstractDownload PDF (544K) -
Shoji Hirokawa1973 Volume 35 Issue 1 Pages 12-17
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effective zero-field splitting parameters, \ ildeDlm, of the O2 molecule in the states of librational motion, Ψlm, are calculated on the assumption that the molecule is subjected to a hindering potential CP2(cosθ). According to experiments on specific heats, C=−306.6 K, \ ildeD1,0=107 GHz and \ ildeD1,1=95.0 GHz. The temperature dependence of the polycrystalline absorption line shape is investigated on the basis of the isotropic g-factor. The main-peak position is 11.56 kG at X band, and 19.33 kG at K band. Small peaks owing to the O2 molecules in Ψ1,1 appear if T>11 K: the positions at X- and K-bands are 11.0 kG and 18.4 kG, respectively. Calculated results account for paramagnetic resonance experiments.View full abstractDownload PDF (620K) -
Takemitsu Hasegawa, Masao Shimizu1973 Volume 35 Issue 1 Pages 18-24
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe self-consistent numerical calculation of the dielectric function based on the theory of Schneider et al. is carried out for an electron gas at metallic density of electrons. The correlation energy, compressibility, dispersion relation of plasmon and pair distribution functions are numerically calculated from the calculated dielectric function. The present result approximately satisfies the compressibility sum rule. The self-consistent numerical calculation of the dynamical spin susceptibility is carried out by extending the self-consistent theory given by Schneider et al., and the spin-dependent pair distribution function and static spin susceptibility are calculated. The calculated value of the static spin susceptibility is found to agree with the observed value for sodium.View full abstractDownload PDF (856K) -
Kunihiko Yamaji, Jun Kondo1973 Volume 35 Issue 1 Pages 25-32
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith the honeycomb, square and triangular lattices the high-temperature susceptibilities and specific heats have been extended up to the eighth and seventh order, respectively, for general spin by means of the method of Rushbrooke and Wood with the aid of high-speed computers. Analyses of these coefficients by means of the ratio and Padé approximant methods seem to give evidences for non-divergence at finite temperatures of the high-temperature susceptibilities of the two-dimensional ferromagnetic Heisenberg spin systems contrary to the assertion of Stanley and Kaplan.View full abstractDownload PDF (980K) -
Tomohei Sasada1973 Volume 35 Issue 1 Pages 33-39
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe non-Markoffian effect on superradiance from an assembly of many harmonic oscillators is investigated based on a theory recently developed by Bonifacio, Schwendimann, and Haake. A superradiance master equation is solved exactly by introducing the coherent state basis. It is shown how the retardation effect, which takes into account a dynamical role of the photon field played during the radiating processes, modifies the shape and Poissonian statistics of superradiant pulses obtained from the Markoffian approach.View full abstractDownload PDF (820K) -
Takashi Odagaki1973 Volume 35 Issue 1 Pages 40-46
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is pointed out that a photon beam, if its intensity exceeds a certain threshold value, can cause spin wave instability in rutile-type antiferromagnets through one photon-two magnon process. Magnons on the boundary of the Brillouin zone are nonthermally excited. Absorption due to two magnon excitation abruptly increases at the threshold. An order estimation of the threshold value is given.View full abstractDownload PDF (652K) -
Kohji Tohyama, Soshin Chikazumi1973 Volume 35 Issue 1 Pages 47-52
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSaturation magnetization, temperature dependence of magnetic susceptibility and that of magnetocrystalline anisotropy were measured for Gd-Y alloys. From the value of saturation magnetization, it was estimated that the introduced Y atoms induce the magnetic moment of 0.25 μB per Y atom. It was also found that the addition of non-magnetic constituent Y causes a change in sign of the anisotropy constant K20 at 0 K and in the temperature dependence of it. The complexity of the anisotropy of pure Gd is interpreted to be partly due to the contribution of the outer electrons.View full abstractDownload PDF (628K) -
Mikio Takano, Teruya Shinjo, Masao Kiyama, Toshio Takada1973 Volume 35 Issue 1 Pages 53-56
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe single-ion hyperfine fields in Fe3+ ions diluted in KAl3(OH)6(SO4)2, γ-AlOOH and ZnAl2O4 have been measured with the Mössbauer effect in an external magnetic field of 50 kOe at liquid helium temperatures. The values are 570±8 kOe, 565±8 kOe, and 550±10 kOe, respectively, while the previously reported hyperfine fields of the corresponding antiferromagnets at 0 K are 490 kOe, 470 kOe and 515 kOe. The remarkable reductions in KFe3(OH)6(SO4)2 and γ-FeOOH indicate large spin deviations due to two dimensional antiferromagnetic interactions.View full abstractDownload PDF (472K) -
Takeo Jo, Hideo Hasegawa, Junjiro Kanamori1973 Volume 35 Issue 1 Pages 57-62
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electronic structure of the fcc ferromagnetic ternary alloy systems, FexCoyNiz, FexNiyMnz and NixCoyMnz(x+y+z=1) are investigated by the use of the coherent potential approximation. In a wide region of the phase diagram the calculated saturation magnetization of FexCoyNiz is well expressed as a function of the average number of electrons of a given alloy, which is in agreement with experimental data. The magnetic moment of each constituent atom shows an interesting concentration dependence; Co magnetic moment for example decreases to a considerable extent by an addition of a few percent of Fe to Ni–Co. The calculated results of FexNiyMnz and NixCoyMnz well reproduce the general tendency of the measured saturation magnetization.View full abstractDownload PDF (740K) -
Takashi Yamaoka, Mamoru Mekata, Hideo Takaki1973 Volume 35 Issue 1 Pages 63-67
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to investigate the magnetic properties of fcc Fe(γ-Fe), the Mössbauer effect was measured in fcc Fe nitrides, FeN0.08−0.11. Specimens were prepared in fine particles to avoid the martensitic transformation at low temperatures. No magnetic ordering was found down to 1.3 K and hence the magnetic moment on the Fe atom is expected to be small in these fcc Fe nitrides. The results are discussed in connection with fcc Fe precipitated in Cu.View full abstractDownload PDF (580K) -
Sasuke Miyazima1973 Volume 35 Issue 1 Pages 68-76
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe phase transition temperature are calculated for two kinds of models for n-layer Ising lattices. One is diluted by non-magnetic impurities and the other consists of two kinds of magnetic substances. When the number of layers n increases, the transition temperature calculated by the high temperature series expansion increases monotonically. In the first model the critical concentration pc decreases with n. Although a single layer lattice with p<pc shows no spontaneous magnetization, there is possibility of giving rise the spontaneous magnetization when we compile several films. In the second model we can find various types of variation for critical temperature depending on the exchange coupling, especially between two different substances. Both in dilute ferromagnets and in ferromagnetic solid solutions, a simple relation may exist between the shift of transition temperatures and the number of layers. The shift of critical concentration also follows the similar simple relation.View full abstractDownload PDF (976K) -
Chao-Yuan Huang, Kazushi Sugawara1973 Volume 35 Issue 1 Pages 77-80
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Van Vleck orbit-lattice interaction appropriate for the ethyl sulfate crystal has been applied to estimate the relaxation rates of Pr3+ in YES and LaES, Tb3+ in YES, and Ho3+ in YES and HoES. The estimates based on our theory along with the phonon bottleneck effect are in good agreement with the experimental data.View full abstractDownload PDF (416K) -
Takasu Hashimoto, Akio Sato, Yasuki Fujiwara1973 Volume 35 Issue 1 Pages 81-84
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to obtain the information about nonlinear terms of the high frequency magnetic susceptibility at 2MHz near the Curie temperature the 2nd and 3rd order nonlinear terms against the high frequency magnetic field are derived from the observations of the 2nd and 3rd harmonics. Both terms decrease abruptly as the temperature deviates from the Curie temperature. It is a very remarkable result that the 2nd harmonic signal is observed above the Curie temperature in contradiction to the simple theoretical consideration. As for the 3rd harmonic its temperature dependence is explained qualitatively by the molecular field theory.View full abstractDownload PDF (428K) -
Toshio Asada1973 Volume 35 Issue 1 Pages 85-94
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic anisotropy due to a few percent of rare earth impurities (Ce∼Tm) in gadolinium metal is studied theoretically by use of a formalism developed in a previous paper. A correction for finite concentration of impurities is carried out to the results calculated on the single impurity system. A single ion type anisotropy is adopted as an origin of the anisotropy of the impurity spin. Fairly good reproductions of torque curves measured by Tajima and Chikazumi are obtained for impurities of the heavy rare earth elements with microscopic anisotropy constants not differing very much from those expected by the usual crystal field theory, whereas for the light ones the status is less satisfactory.View full abstractDownload PDF (1284K) -
Michio Kiritani1973 Volume 35 Issue 1 Pages 95-107
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA method to perform a computer simulation of the step-wise reactions among vacancies up to large vacancy clusters is contrived to analyze the clustering process in an exhausting system as quenched-in vacancies. The variations of the progress of vacancy clustering with aging temperature and with the size of stable nucleus are investigated. Initial transient decrease of mobile vacancies with a rapid increase of small vancancy complexes establishes mutual quasi-equilibrium. Stationary stage of small vacancy complexes following the initial transient corresponds to the nucleation period of vacancy clustered defects. Factors which determine the size distribution of final clusters are discussed. Existence of a definite stable nucleus for a dislocation loop in aluminum is denied. Agreement of the computed results with experiment is obtained when small binding energies of a vacancy to vacancy clusters are postulated, i.e., less than 0.2 eV up to the cluster of forty vacancies.View full abstractDownload PDF (1676K) -
Ushio Kawabe, Mitsuhiro Kudo, Shigeo Fukase1973 Volume 35 Issue 1 Pages 108-112
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTernary and quaternary A-15 type compounds, Nb3Al1−yMy (M=Be, B) and (Nb1−xTax)3Al1−yGey, were investigated in the composition range where the A-15 structure was stable. The superconducting critical temperatures of these compounds were measured as a function of composition (x and y), lattice constant, and condition of heat treatment. It was found that the critical temperature is enhanced up to near 20 K by substituting such the quest elements for Al in a stoichiometric compound Nb3Al. Magnetic field dependences of the critical current density were also discussed for as-cast and aged samples.View full abstractDownload PDF (612K) -
Teruo Sakurai1973 Volume 35 Issue 1 Pages 113-119
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe atomic displacements in the spherical G–P zones precipitated in an Al–Zn single crystal are studied by analyzing the backscattered energy spectra of high energy protons. The analysis is carried out on the basis of the displaced atom model proposed by Merz and Gerold. The results obtained from the analysis on direct-scattering show that the values of distortion constant are 0.64×10−2 and 1.27×10−2 for the G–P zones with radius 40 Å and 20 Å respectively.View full abstractDownload PDF (896K) -
Katsumi Yoshino, Keiichi Kaneto, Kyoichi Tatsuno, Yoshio Inuishi1973 Volume 35 Issue 1 Pages 120-124
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThermally stimulated currents in various metal and metal free phthalocyanine single crystals (H2Pc, ZnPc, CoPc, CuPc, NiPc) and the carrier drift mobility in ZnPc are investigated. The trap depth is estimated to be 0.37±0.03 eV for those phthalocyanines commonly. The drift mobility of electrons in ZnPc is found to be nearly 0.1 cm2/V·sec at room temperature by the time of flight method. Dependence of induced current on ruby and glass laser intensity show that the triplet state plays an important role in the carrier generation in the near infrared. The phosphorescence emission in ZnPc and CuPc supports this result.View full abstractDownload PDF (596K) -
Kazuko Kubo1973 Volume 35 Issue 1 Pages 125-129
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSProton-induced change in microhardness was measured on the cleavage plane of NaF crystals as a function of depth from the bombarded surface. The profile obtained includes maxima, one of which is possibly due to the protons stopped after penetration. The others appear to be related to either the nuclear reaction 19F(p, αγ)16O or the strain resulting from expansion due to the atomic displacements by protons. The hardening centers are likely to be submicroscopic inclusions, probably consisting of metallic precipitates and gas bubbles as well as voids.
Decrease in the microhardness beyond the range end is exponential up to about 20 μm, while the change in dislocation mobility extends as far as 100 μm beyond the range end. The form of the profile is influenced by both temperature and proton dosage.View full abstractDownload PDF (1128K) -
Toshiro Yamada1973 Volume 35 Issue 1 Pages 130-133
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe a. c. resistivity in the range of 100 Hz to 100 MHz and thermoelectric power were measured for CoFe2−xTixO4 and Co1−xFe2+xO4 single crystals (x=0.06, 0.10. and 0.14) in the temperature range between 78 and 300 K. Electrical properties are quite similar for both systems. The concentration of electron carriers increases exponentially with increasing temperature. Its activation energy decreases with increasing ferrous ion contents (x). The mobility takes the value of 2×10−2 cm2/V.sec at 300 K and decreases with decreasing temperature. Its activation energy is about 0.05 eV and does not depend on x.
The electrical conduction for both systems is satisfactorily explained in terms of the small-polaron hopping model.View full abstractDownload PDF (528K) -
Masanori Okuyama, Taneo Nishino, Yoshihiro Hamakawa1973 Volume 35 Issue 1 Pages 134-136
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA generalized expression of broadened complex dielectric functions near one-, two- and three-dimensional critical points has been demonstrated as the functions of parameters of photon energy hω, critical point energy hωg and broadening factor Γ. A systematic relationship has been presented in differential dielectric functions modulated with energy parameters of ω, ωg and Γ. By using the relationship, the line shapes of the modulated spectra for any dimensional critical point can be easily figured from a differential function.View full abstractDownload PDF (268K) -
Atsuko Sumi, Yutaka Toyozawa1973 Volume 35 Issue 1 Pages 137-145
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith Feynman’s path integral method applied to an electron interacting with acoustic as well as with optical modes of lattice vibrations, it is shown that the abrupt change, as coupling increases, of the polaron state from nearly free type to self-trapping type is caused by the short range interaction (deformation potential due to acoustic vibrations) but not by the long range interaction (electric polarization field due to optical vibrations), in agreement with previous argument. Whether or not one takes into account the discreteness of electron coordinate has no relevance to the very existence of the abrupt change, although the quasi-continuum model leads to underestimation of its magnitude. When the rigid lattice band width is not large compared to the average phonon energy, however, one can no more distinguish between the nearly free state and the self-trapping state in a clear-cut way.View full abstractDownload PDF (1088K) -
Toshinobu Soma, Mizuhiko Saeki, Akira Morita1973 Volume 35 Issue 1 Pages 146-148
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe interstitial in Si and Ge is investigated theoretically by using the extended perturbation theory in pseudopotential formalism developed by two of the authors (A. M. and T. S.). It is shown that the interstitial is most stable at the hexagonal site and its diffusion path is hexagonal→tetrahedral→hexagonal. The calculated migration energy of the interstitial is 0.18 eV for Si and 0.09 eV for Ge.View full abstractDownload PDF (296K) -
Koichi Wakita, Masayoshi Umeno, Katsuaki Takagi, Shichiro Miki1973 Volume 35 Issue 1 Pages 149-156
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThermal Brillouin scattering spectra in CdS have been obtained at room temperature by using a sensitive photoelectric detection, a gas-scanning Fabry-Perot interferometer and a He–Ne laser with wave-length 632.8 nm. The elastic and the photoelastic anisotropy in CdS have been explored from a combination of measurements of frequency shifts and intensities of the components in polarized spectra at scattering angle 90°. From them, the absolute values of elastic constants and relative magnitudes of photoelastic constants are determined. The scattering intensities of CdS are compared with those of materials whose photoelastic constants are known, e.g. quartz, and the absolute value of unknown photoelastic constant P44 of CdS is determined to be 0.049.View full abstractDownload PDF (928K) -
Katsumi Hamano1973 Volume 35 Issue 1 Pages 157-163
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpontaneous polarization of NaNO2 was determined by reversing Ps with a relatively low dc field of from 60 V/cm to 12 kV/cm and measuring the polarization reversal charge with an electrometer and a recorder. A clear jump in Ps of 5.8 μC/cm2 was observed at the Curie point Tc. The dielectric constant ε22 in the ferroelectric phase obeys the Curie-Weiss law very well over a wide temperature range and Ps is proportional to (1−T⁄T0)0.20±0.02 over 25°C below Tc, where T0 is the ferroelectric Curie-Weiss temperature. Below room temperature Ps does not vary appreciably. The saturation polarization is estimated to be 11.9 μC/cm2. The electronic contribution to Ps is discussed on the basis of a point-dipole approximation. It is probable that about one third of the total spontaneous polarization is contributed from the electronic polarization. The experimental technique is described in detail.View full abstractDownload PDF (1016K) -
Akiko Imatake1973 Volume 35 Issue 1 Pages 164-171
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe concentration dependence of the excitation spectra of donors is investigated theoretically, in the low concentration region of the impurity conduction. A new interpretation of the broadening mechanism of the excitation spectra is presented, according to which the interaction of excited donor states with the so-called D− band formed by the surrounding neutral donors plays an important role. The analysis of the isolated line and the continuous spectrum of the absorption is made separately. The comparison with the experimental result of the absorption spectra for arsenic donors in germanium is made.View full abstractDownload PDF (1020K) -
Shoichiro Sakoda, Yutaka Toyozawa1973 Volume 35 Issue 1 Pages 172-179
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Jahn-Teller effect on the optical spectra of degenerate exciton is investigated. The lattice vibrations interacting with exciton are treated quasi-classically, in terms of the quasi-molecular mode localized around each lattice site.
The optical spectra for both the doubly degenerate and the triply degenerate excitons are calculated with the coherent potential approximation. If the ratio α of the local level splitting \sqrtc2kT to the half of the exciton band width B is larger than unity, the distinct Jahn-Teller splitting of the optical spectra is observable. When α<1 the spectral splitting is washed out due to motional narrowing. A brief discussion on a relevant experiment is given.View full abstractDownload PDF (908K) -
Kêitsiro Aizu1973 Volume 35 Issue 1 Pages 180-187
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWhen the point group of the prototypic phase and the irreducible representation for the soft vibrational modes with zero wavenumber are specified at discretion, the ferroic species are determined and the faintness indices for ferroelectricity and ferroelasticity are evaluated. The results are shown together in a table, by surveying which it is found that with respect to the electric polarization components the faintness indices range from 1 to 6, and with respect to the mechanical strain components from 1 to 3. It is also found that of the 212 nonmagnetic ferroic species 48 are not generated by a zero-wavenumber vibrational mode or a set of degenerate zero-wavenumber vibrational modes.View full abstractDownload PDF (776K) -
Shin Takeuchi1973 Volume 35 Issue 1 Pages 188-193
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSJohnston-Gilman’s theory of yielding was extended to the inhomogeneous deformation where the yielding takes place by the increase of the plastic zone or slip bands. The plastic strain rate \dotγ* and the mobile dislocation density Nm in slip bands at an applied stress were assumed to be determined by the condition that \dotγ* should take a maximum value or (∂\dotγ*⁄∂Nm)τ=0. The differential equation representing the yielding curve was formulated for the case where the velocity-stress relation of an isolated dislocation is expressed by v=(τ⁄τ0)m and the fractional area of the plastic zone is a given function of strain. This model correlates the velocity-stress relation directly with the lower yield stress. Calculated results for specific cases were in satisfactory agreement with experiments.View full abstractDownload PDF (684K) -
M. N. Sharma, R. Jain1973 Volume 35 Issue 1 Pages 194-198
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe general equation for Anderson-Grüneisen parameter δ developed by Sharma and Tripathi (Phys. Letters A39 (1972) 281) has been tested theoretically by computing the δ values for bcc and fcc types of ionic crystals employing the central force rigid ion interaction model. Furthermore, the Anderson-Grüneisen parameter has also been calculated from two relations of Chang. The dilemma confronted by Chang, regarding the correctness of these two relations for δ has been resolved.View full abstractDownload PDF (592K) -
Kazuo Gesi, Kunio Ozawa1973 Volume 35 Issue 1 Pages 199-203
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric constant of single crystals of AgNa(NO2)2 was measured along the ferroelectric b-axis as a function of temperature at various hydrostatic pressures up to 8 kbar. The Curie point Tc and the paraelectric Curie temperature θ vary linearly with pressure p with the coefficients of dTc⁄dp=(9.4±0.2) °C kbar−1, and dθ⁄dp=(9.3±0.2) °C kbar−1. The dielectric relaxation time at Tc decreases with increasing pressure. The pressure effect on the dielectric relaxation is discussed on the basis of a molecular field theory.View full abstractDownload PDF (516K) -
Masashi Iizumi1973 Volume 35 Issue 1 Pages 204-212
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe half widths of the phonon energies of the acoustic modes propagating along the ⟨111⟩ axes of calcium fluoride, which is one of substances manifesting conspicuous anharmonicity in the temperature factor, have been measured at temperatures above 20 K up to 573 K with the thermal neutron scattering techniques. The individual phonon widths variously depend on temperature. The phonon widths at room temperature, about 1.5 to 2 meV and 1.0 meV for the longitudinal and transverse modes, respectively, are comparable to those observed hitherto in other substances. Therefore the conspicuous anharmonicity in the temperature factor does not generally implies the prominent phonon-phonon interactions. The former should rather be regarded as a result of the crystal symmetry on integral quantities.
Anormalous line shapes have been observed for the longitudinal mode around q=0.4 qmax. They probably reflect the frequency-dependent self-energy of the phonon.View full abstractDownload PDF (1244K) -
Ayahiko Ichimiya1973 Volume 35 Issue 1 Pages 213-223
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown theoretically that the intensity of diffuse background in electron diffraction patterns is mainly contributed from the multiple thermal scattering. At room temperature the intensity distribution in most cases in nearly the same as that of the multiple elastic scattering in amorphous materials. The theory is confirmed at accelerating voltages 100, 200 and 450 kV by measurements of intensities transmitted through silver single crystals of thicknesses from 0.05 μm to 1.2 μm. The mean and anomalous absorption coefficients measured at the (220) Bragg position at room temperature are μ0=2.9×10−3/Å and μ220=1.5×10−3/Å at 100 kV, and μ0=1.4×10−3/Å and μ220=0.8×10−3/Å at 450 kV. These results are in good agreement with the theoretical values in literatures. The maximum observable thickness for images of crystal imperfections is also calculated for some crystals, and the results are compared with experimental results.View full abstractDownload PDF (1900K) -
Hiroshi Fujita, Naoto Sumida, Teizo Tabata1973 Volume 35 Issue 1 Pages 224-229
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe anomalous transmission of electrons in aluminum has been examined over the voltage range 0.5 to 3 MV by electron microscopy. The anomalous transmission begins to appear at about 1 MV at the symmetry position of 111 reflections, and at about 2 MV in a case of 200 reflections. The degree of anomalous transmission increases with increasing accelerating voltage up to 3 MV.
The experimental results are compared with those of 18/8 type stainless steel, and discussed in terms of the axial and planar channeling parameters of electrons proposed by Fujimoto et al. The anomalous transmission phenomenon in these metals shows good correlation with the planar channeling parameter, and is also related to the axial one when the same systematic set of reflections is used.View full abstractDownload PDF (1932K) -
Noriaki Tsukada, Tsutomu Yabuzaki, Toru Ogawa1973 Volume 35 Issue 1 Pages 230-236
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe evolution of magnetization of optically pumped atoms in the presence of two rotating rf fields with different frequencies is investigated by using the phenomenological Bloch equation. It is shown that the new type resonances, which are due to the effect of the transverse pumping, together with the ordinary magnetic resonance and the multiple quantum transitions are realized under these conditions. It is also shown that the Hanle curve is broadened by a rotating rf field in the same manner as by an oscillating rf field, and is shifted towards high field region as the intensity of the rotating rf field is increased. The results obtained are, in general, applicable to the case of an elliptically rotating rf field, which is superposition of two rotating rf fields.View full abstractDownload PDF (828K) -
Takayoshi Amano, Tadao Shimizu1973 Volume 35 Issue 1 Pages 237-241
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTransient nutations in the J=K, J=K+1, and J=K+2 inversion transitions of ammonia are observed by applying repetitive pulse voltage to the repellor of a klystron. The reciprocal of the damping time constant T2 increases linearly with the pressure in the range of 6 mTorr to 50 mTorr, and depends on J and K in the same manner as the linewidth. The magnitude of 1⁄2πT2 for each transition is found to be systematically smaller than the corresponding linewidth measured by Legan et al. The linewidths are remeasured on the J=3, K=3 and J=3, K=2 transitions, and a reasonable agreement with 1⁄2πT2 is obtained.View full abstractDownload PDF (592K) -
B. J. Choudhury1973 Volume 35 Issue 1 Pages 242-243
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinear polarization is shown to dominate over circular polarization cross section for the ionization of H− by CO2 laser operating at frequency ω=0.118 eV.View full abstractDownload PDF (156K) -
Shinji Hiroe1973 Volume 35 Issue 1 Pages 244-250
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe extraordinary waves in an inhomogeneous magnetoplasma are studied. These waves are excited between the upper hybrid (ωp2(r)=ω2−ωc2) and the left hand cutoff (ωp2(r)=ω2+ωωc). The extraordinary waves propagate from the left hand cutoff point to the upper hybrid point perpendicularly to the static magnetic field lines of forces, so that the extraordinary waves are not excited near the upper hybrid but near the cutoff.View full abstractDownload PDF (880K) -
Koichi Saéki1973 Volume 35 Issue 1 Pages 251-257
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA large-amplitude electron plasma wave in a bounded collisionless plasma is observed to steepen and form a shock with a trailing wave train. The dependence of the Mach number and the period of the wave train on the shock amplitude shows that the shock structure is related to solitary waves. For a larger-amplitude shock, however, the trailing wave train is small or disappears, and a potential jump followed by large-amplitude oscillations propagating with a slower velocity than that of the shock front is observed. The amplitude of the oscillations is sufficiently large to trap a significant number of electrons and to form vortices in phase space.View full abstractDownload PDF (1020K) -
Kazunari Ikuta1973 Volume 35 Issue 1 Pages 258-260
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInjection of a neutralized relativistic electron ring into a toroidal plasma is shown to increase the toroidal plasma current, provided the aspect ratio (minor to major radius ratio) of the ring is at least η−1⁄2 times larger than that of the toroidal plasma, where η is the ratio of the major radius of the ring to the major radius of the ring after coalescence.View full abstractDownload PDF (276K) -
Kunioki Mima1973 Volume 35 Issue 1 Pages 261-271
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe wave kinetic equation derived in our preceding paper (J. Phys. Soc. Japan 34 (1972) 1620) is applied to the investigation of the effect of finite resonance width on the nonlinear Landau damping of electron plasma waves on electrons. When the resonance width is produced by low phase-velocity waves or ion-waves, the nonlinear Landau damping is strongly modified in two respects. First, its rate is enhanced even if the total energy of the low phase-velocity waves is relatively small (of order 8×10−3 times the electron thermal energy for the case of an isotropic spectrum of these waves). Secondly, the Manley-Rowe relation or the conservation of the total plasmon number is violated and as a result an efficient dissipation of the electron plasma wave energy into the electron thermal energy is obtained.View full abstractDownload PDF (864K) -
Kazuo Kitao1973 Volume 35 Issue 1 Pages 272-276
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe general features of the electrostatic oscillations in a lossfree plasma are discussed from the dispersion relation and energy equation. It is shown that the unstable electrostatic waves in a lossfree plasma have always zero energy density which is realized as a sum of a negative kinetic energy density and a positive electrostatic energy density. The feedback stabilization for reactive instabilities is reconsidered by a simple model, and a cold electron plasma-beam system is studied as a simple example.View full abstractDownload PDF (624K) -
Hiroshi Toyama, Kiyokata Matsuura1973 Volume 35 Issue 1 Pages 277-280
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe rf power absorbed at the perpendicular ion cyclotron resonance of an H–D plasma is calculated using the model of an infinitely long coil, with electron density, ion temperature, and the H–D concentration ratio as the parameters.View full abstractDownload PDF (384K) -
Kalyan Kumar Bagchi, Lokenath Debnath1973 Volume 35 Issue 1 Pages 281-285
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn initial value investigation is made of the unsteady dispersive long waves on the surface of a homogeneous rotating shallow ocean due to an arbitrary travelling wind stress distribution acting on the free surface of the ocean. An asymptotic solution for the free surface displacement function is derived by using the generalized Fourier transform and its asymptotic behaviour. Some oscillatory or transient travelling wind stress distributions of physical interest are included in the analysis for the investigation of the dispersive long waves. It is shown that the wave motion asymptotically approaches to its ultimate steady state as the time tends to infinity. Several limiting cases of interest are discussed.View full abstractDownload PDF (532K) -
Ryogo Hirota1973 Volume 35 Issue 1 Pages 286-288
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExact N-soliton solutions have been obtained for the nonlinear lumped network equation,
(Remark: Graphics omitted.).
The solutions have the same functional forms as the N-soliton solution of the Korteweg-de Vries equation.View full abstractDownload PDF (236K) -
Ryogo Hirota1973 Volume 35 Issue 1 Pages 289-294
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSExact N-soliton solutions have been obtained for the nonlinear lumped self-dual network equations
(Remark: Graphics omitted.),
(Remark: Graphics omitted.).
The solutions have the same functional forms as the N-soliton solutions of the modified Korteweg-de Vries equation.View full abstractDownload PDF (424K) -
Hiromasa Hirakawa1973 Volume 35 Issue 1 Pages 295-297
Published: July 05, 1973
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe equation of the vibrational motion of an isotropic elastic body in the field of gravitational wave is obtained. Using the eigenfunction expansion of the motion, the dispersion equation of the gravitational wave in a medium composed of dispersed elastic bodies is presented.View full abstractDownload PDF (268K) -
Toshio Ozone, Hiroaki Morita, Hidetoshi Hiroyoshi, Hideo Saito1973 Volume 35 Issue 1 Pages 298
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (124K) -
Masahiro Hirano, Ichiro Yoshino, Takashi Okuda, Tachiro Tsushima1973 Volume 35 Issue 1 Pages 299
Published: July 05, 1973
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (164K)