-
Hiroaki Tsubota, Nobuaki Kawamura, Siro Oikawa, Jun-ichi Uegaki
1975Volume 38Issue 2 Pages
299-304
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Proton energy spectra have been measured at 90° for the
19F(e, e′p)
18O reaction in the giant resonance region. The (γ, p
0) and (γ, p
1) differential cross sections are extracted from the proton energy spectra by using virtual-photon spectra. The integrated differential cross section of the (γ, p
0) and (γ, p
1) reactions are 1.80±0.27 and 0.50±0.45 MeV-mb/sr, respectively. The results are discussed with the shell model theory by comparing with the (γ, p
0) cross section of the neighboring 4
n-nucleus
20Ne. A significant increase of the proton yield leaving the non-ground states is found at 25 MeV of the incident electron energy. This is discussed in terms of the core excitation effect.
View full abstract
-
Masatoshi Koshiba
1975Volume 38Issue 2 Pages
305-307
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
In connection with the result of a CERN–ISR experiment, a question is raised regarding the existence of “Hadronic Ether” for very high energy hadron collision phenomena.
View full abstract
-
Yoshihiko Onizuka, Tsuyoshi Sugimitsu, Norihisa Kato, Tokihiro Kuroyan ...
1975Volume 38Issue 2 Pages
308-313
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The level structure of
71Ge has been investigated by observing both de-excitation gamma rays and conversion electrons following the
71Ga(p, n)
71Ge reaction at the proton energies between 1.5 and 2.0 MeV. From analysis of the excitation function of the gamma rays, energies of 9 excited levels were confirmed. Multipolarities of 10 transitions were determined, and spins and parities of the associated levels were proposed without speculation.
View full abstract
-
Kiyoshi Kawade, Hiroshi Yamamoto, Yujiro Ikeda, Toshio Katoh
1975Volume 38Issue 2 Pages
314-321
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Decay of
178m,gLu has been studied by using Ge(Li), NaI(Tl) and plastic detectors. Sources were prepared by the
179Hf(γ, p)
178m,gLu reaction. Thirty-nine of forty γ-rays are assigned to the
178Hf level scheme, which includes six newly observed levels at 1174.4(
IπK=2
+2), 1199.3(0
+0), 1276.8(2
+0) and 1322.4(3
−2) keV in the
178gLu decay and at 1364.04(9
−8) and 1601.6(10
−8) keV in the
178mLu decay.
Qβ values are 2.05±0.05 MeV for
178gLu and 2.25±0.03 MeV for
178mLu. The most probable spin-parity assignments of 1
+ and 9
− are proposed for the ground and isomeric states of
178Lu, respectively. There is reasonable agreement between the experimental β branching ratios from
178mLu to the 8
− band at 1147 keV and the Alaga rules. Discussions on the
178Hf levels are made mainly on the basis of log
ft values.
View full abstract
-
Atsuo Morinaga, Kazuo Hisatake
1975Volume 38Issue 2 Pages
322-329
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Penetration parameters λ are determined by using internal conversion intensities and coefficients for low energy hindered M1 transitions of
131Cs,
135La,
137La and
139La together with E2/M1 mixing ratios δ
2. The results are; λ(86.9,
135La)=14.5±5.5, λ(10.5,
137La)=10±5, λ(166,
139La)=3.6±1.8 and λ(92.3,
131Cs)=4±4, where numbers in parentheses are transition energies in keV.
View full abstract
-
Sadao Nakajima, Yasunari Kurihara
1975Volume 38Issue 2 Pages
330-335
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The static strain wave, which appears in pure chromium below the Néel point, is accounted for in terms of itinerant electrons coupled with phonons.
View full abstract
-
Yoshimasa Itoh
1975Volume 38Issue 2 Pages
336-344
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Ultrasonic attenuation in an insulating simple cubic Heisenberg antiferromagnet near the magnetic phase transition point is investigated on the basis of Mori’s theory of irreversible processes. The sound wave is assumed to couple mainly to the spin-energy-density fluctuation which decays via a fast non-diffusive relaxation process arising from the spin-lattice interaction. Firstly, the relaxation time of the spin-energy-density fluctuation, τ, and then the sound attenuation coefficient, α
q, is calculated. The calculations of τ and α
q applied to RbMnF
3 agree
quantitatively with the experimental results. The contribution of the longitudinal thermal-phonons to 1/τ is found to be 1/7 of that of the transverse thermal-phonons. The present calculations for RbMnF
3 involve none of adjustable parameters. The sound attenuation coefficient of MnF
2 also is discussed.
View full abstract
-
Takasu Hashimoto, Akio Sato
1975Volume 38Issue 2 Pages
345-350
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The magnetic susceptibilities of K
2CuF
4 in a high frequency magnetic field were measured in the frequency range from 3 MHz to 64 MHz and in the temperature range from 5.5 K to 7.5 K using a Schering bridge. The relaxation time of spin system in K
2CuF
4 near
Tc in the paramagnetic region was estimated from the frequency dependence of the real and the imaginary parts of the high frequency magnetic susceptibility. It is inferred from our results that the relaxation mechanism of spin system in K
2CuF
4 in the paramagnetic region is monodispersive. The relaxation time increases extremely, when temperature approaches
Tc. The relaxation time very near
Tc is about 3×10
−9 sec.
View full abstract
-
Kazuo Hattori
1975Volume 38Issue 2 Pages
351-355
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Intermediate coupling theory is applied to get the energy spectrum of an electron or a hole which is on a spheroidal energy surface and interacts with longitudinal optical phonons at finite temperature. Anisotropic hole polaron masses of TlBr and TlCl at 290 K are calculated. The energy spectrum of a polaron with an anisotropic effective mass which is bound in a Coulomb potential has also been discussed.
View full abstract
-
Kazuo Hattori
1975Volume 38Issue 2 Pages
356-359
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Intermediate coupling theory at finite temperature is developed to the problem of a bound polaron. Ground state energy and energy levels of a few low lying excited states are calculated. Shallow donor levels in CdS are discussed. A good agreement of the theory with experiment is found, though piezoelectric and anisotropic effects are not taken into account.
View full abstract
-
Kazuo Hattori
1975Volume 38Issue 2 Pages
360-364
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The absorption coefficients of free piezoelectric and anisotropic optical polarons are calculated to the first order of the electron-phonon coupling constant, in the framework of the Lee, Low and Pines variational method. In the case of the anisotropic optical polaron, a bare electron is assumed to be on a spheroidal energy surface.
View full abstract
-
Takeshi Sugiura, Katsutoshi Iwahashi, Kazumi Horai, Yoshika Masuda
1975Volume 38Issue 2 Pages
365-372
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The magnetic properties of rhombohedral Cr
2S
3 single crystals were investigated. The remarkable temperature dependences of the small spontaneous magnetization, the magnetic susceptibilities and the resonance condition below Néel temperature were observed. Magnetic behavior of this compound can not be explained by a model of simple ferrimagnet. Assuming the two-sublattice model in which the Dzyaloshinsky-Moriya interaction and the difference in magnitude of the sublattice magnetizations are taken into account, the magnetization, the susceptibilities and the magnetic resonance condition were calculated. The exchange, Dzyaloshinsky-Moriya and anisotropy fields were determined.
View full abstract
-
Kunio Saiki
1975Volume 38Issue 2 Pages
373-382
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The temperature dependence of anisotropy energy in the canted antiferromagnet KMnF
3 with Dzyaloshinsky-Moriya interaction has been investigated by analyzing the antiferromagnetic resonance. At the liquid nitrogen temperature and in the absence of the applied field, the antiferromagnetic axis of sublattice magnetizations is parallel to [001] of the tetragonal pseudocell. But, at
TR∼50K, this axis begins to rotate away. This behavior is related with an anomalous maximum of the magnetic susceptibility. The a.c. magnetic susceptibility calculated from the free energy expression on the spin system indicates that
(
Remark: Graphics omitted.), for
T>
TR and
(
Remark: Graphics omitted.), for
T<
TR,
where
H4 and
HK−
HK′ are, respectively, the cubic anisotropy field and the orthorhombic anisotropy field. The experimental result shows that there exists a second order phase transition due to the onset of a gradual rotation of the antiferromagnetic axis.
View full abstract
-
Hiroshi Terui, Takemi Komatsubara, Eiji Hirahara
1975Volume 38Issue 2 Pages
383-390
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The critical phenomena near the Curie temperature in a single crystal of manganese phosphide are studied by the magnetization measurement. The magnetization along the easy axis is precisely measured and the values of the critical exponents are determined as γ=1.29±0.05, β=0.34±0.02 and δ=4.89±0.1, with the Curie temperature of 290.59±0.02 K by the least mean square method. Furthermore, the critical exponent parameters for the hard-axis magnetization are obtained by the conventional method assuming that the critical hypothesis is valid in this case.
View full abstract
-
Migaku Takahashi, Tokuo Wakiyama, Takeshi Anayama, Minoru Takahashi, T ...
1975Volume 38Issue 2 Pages
391-399
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
A study of the magnetic anisotropy induced by cold rolling was made for h.c.p. Co and Co–Ni single crystals containing 10 and 20 at %Ni by using a torque magnetometer. The observed induced uniaxial anisotropy
Kur for Co was found to be maximum, −5×10
5 erg/cm
3, at about
R=5%, where the direction of the easy axis was parallel to the rolling direction. For the 10%Ni–Co alloy, the similar dependence of
Kur on
R was observed, although the sign in
Kur was changed from negative to positive for
R around 30%. For the 20%Ni–Co alloy, the values of
Kur was found to increase with
R and to be about 4×10
5 erg/cm
3 at
R=60%.
The results are discussed in terms of the magnetoelastic coupling energy associated with lattice defects and also in connection with the slip induced directional order.
View full abstract
-
Shuichiro Anzai, Yoshikazu Hamaguchi
1975Volume 38Issue 2 Pages
400-403
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Lattice parameters of hexagonal Cr
5S
6 have been determined as a function of temperature by X-ray diffraction between 80 K and 400 K. Marked changes in temperature slope for
c- and
a-axes appear at the noncollinear-to-collinear transition temperature
Tt=(167±2) K and at the ferrimagnetic Curie temperature
Tc=(310±5) K. The slope of
c-axis changes from negative to positive at
Tt as the temperature is raised. Observed changes in slope for cell volume at
Tt and
Tc agree with those calculated from the Ehrenfest relation. This correspondence is consisted with the second order characteristics predicted theoretically by Dwight
et al. Positive amounts of departure from usual thermal expansions for phonons are observed on both axes below
Tc, which are well explained in terms of exchange striction.
View full abstract
-
Yuichiro Murakami
1975Volume 38Issue 2 Pages
404-407
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
In–Tl alloy undergoes a martensitic transformation from f.c.c. to f.c.t. and becomes a superconductor below about 3.4 K. These transitions are treated by a phenomenological theory based on the Landau’s theory of phase transition. Temperature dependence of spontaneous strain (
c⁄
a-1 of f.c.t. phase), elastic constant (C
11−C
12)/2, and composition dependence of martensitic and superconducting transition temperatures are calculated. A good agreement with the experiment is obtained.
View full abstract
-
Takafumi Aomine, Kaoru Yamafuji
1975Volume 38Issue 2 Pages
408-415
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The induced electric field caused by a steady flux flow in a superconducting aluminum film with the thickness much smaller than the coherence length was observed by applying magnetic fields with spatial gradients. The observed results were analysed in terms of the “critical-state” model. It is expected that, when the distribution of the external magnetic field is appropriate, the fluxoids are nucleated inside the film, i.e., at the both edges of a new region with the width of the order of the effective penetration depth and flow to both the outside directions. This new region is the countertype of the annihilation region which sometimes appears in a usual flux flow. The existence of a kind of threshold was observed for this type of flow and its value was increased as the temperature was reduced, whereas such a threshold has not yet been observed in a usual flow.
View full abstract
-
Shinya Wakoh, Yasunori Kubo, Jiro Yamashita
1975Volume 38Issue 2 Pages
416-422
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The angular correlation curves due to the two photon positron annihilation process in vanadium and niobium are calculated by APW method. The agreement between theory and experiment is found to be excellent, and especially, the substantial anisotropy is well reproduced by the calculation, although the experimental values are a little higher than the theoretical ones in the region of small momentum. It is concluded that the electronic distribution in these transition metals is well explained by an independent-particle model of APW method when a proper effective one-electron potential is adopted. It is also concluded that positron probes do not seem to perturb the system much. Therefore, the experimental results of the positron annihilation are useful in providing information about electronic structures in transition metals.
View full abstract
-
Nobuhiro Shiotani, Takuya Okada, Tadashi Mizoguchi, Hisashi Sekizawa
1975Volume 38Issue 2 Pages
423-430
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Angular distributions of two photons resulted from annihilation of positrons in V and Nb were measured along three principal crystallographic directions and conspicuous structures and anisotropies were found. The observed curves were compared with the results of the APW calculation by Wakoh
et al. The agreement between the theory and the experiment in the fine structures and the anisotropies was remarkable, supporting the validity of one-electron approximation scheme. However, a slight common discrepancy that the theoretical curves are a little lower than the experimental ones in small momentum region was found, suggesting the limitation of applicability of the independent particle model. Observed differences between V and Nb curves were attributed to the differences in details of the band structures of these metals.
View full abstract
-
Eiichi Kuramoto, Fumio Iida, Shin Takeuchi, Taira Suzuki
1975Volume 38Issue 2 Pages
431-434
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Using a
3He cryostat, the flow stress increment
Δτ
sn associated with superconducting-normal transition has been investigated in the temperature range between 0.5 K and
Tc (1.183 K) for Al single crystals of three different purities, i.e., 99.999%, 99.99% and 99.7%. It was found that
Δτ
sn increased as the purity decreased and that in all cases values of
Δτ
sn in stage II were smaller than those in stage I in contrast to the results on Pb single crystals. The temperature dependence of
Δτ
sn for each deformation stage roughly agreed with that of the electron drag coefficient obtained from the BCS theory, i.e.,
ΔBe=
Ben(1−
Γ),
Γ=2(1+exp(
Δ(
T))⁄
kT))
−1. The temperature dependence of flow stress below
Tc was positive in the superconducting state, while it is slightly negative in the normal state.
View full abstract
-
Yunosuke Makita, Koichi Kobayashi
1975Volume 38Issue 2 Pages
435-442
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Photomagneto-current effect was found in TlCl and TlBr single crystals under the transient condition by the illumination of the light of high absorption coefficient at 1.8K. A current is observed to flow in the direction which depends upon the direction and the magnitude of the applied magnetic field and the absorption coefficient of the exciting light as well as the direction and the magnitude of the applied electric field. The observed result was analyzed in terms of the combination of a diffusion current and a current by the electric field under the magnetic field. Electron and hole mobility at the surface were determined, and their values were found to be smaller than that of the bulk crystal by a factor of 2∼3. The wavelength dependence of the magneto-photoconductivity is explained by the above mechanism.
View full abstract
-
Masashi Iizumi, Yoshikazu Hamaguchi, Kiichi F. Komatsubara, Yoshiki Ka ...
1975Volume 38Issue 2 Pages
443-449
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The phase transition in SnTe was investigated on a single crystal with low carrier concentration (0.88×10
20 cm
−3) by the neutron diffraction method. A second-order phase transition takes place at 98 K. Comparison of this considerably high transition temperature with previous data has revealed that the phase transition is strongly dependent on the carrier concentration and that the above temperature may be taken as an almost carrier-free limit. Possible origins of this dependence are speculated. Temperature change of the relative displacement of two sublattices in the rhombohedral phase was derived. At 25 K the single atom-position parameter deviates by 0.0040 from the value, 0.25, in the cubic phase. In the pseudobinary Pb
1−xSn
xTe system no evidence of phase transition was found for tin content
x up to 0.35 at temperatures higher than 5 K even with low carrier concentration samples.
View full abstract
-
Hitoshi Nishimura
1975Volume 38Issue 2 Pages
450-458
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
Luminescences and their excitation spectra in KI crystals were studied at a temperature range of 5∼100 K. Under the excitation in the first exciton absorption band only one luminescence at 3.01 eV appeared at low temperatures. However, at high temperatures the 3.01 eV luminescence intensity decreased and instead the 3.31 eV luminescence appeared, while the sum of the yields of both the luminescences remained constant. The temperature dependences of these yields were dependent on the excitation energy in the exciton band. The 3.01 eV luminescence was attributed to self trapping of a free exciton to a triplet state of a self trapped exciton by a tunnel effect, and the 3.31 eV luminescence to also self trapping of the free exciton to another triplet state by a thermal transition. Probabilities of the two processes of self trapping were found to depend on excitation energy in the exciton band.
View full abstract
-
Kazuo Gesi, Kunio Ozawa
1975Volume 38Issue 2 Pages
459-462
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
Effect of hydrostatic pressure on the ferroelectric Curie temperatures of RbHSO
4 and RbDSO
4 was studied by dielectric constant measurements at high pressures. The observed pressure coefficients of the Curie temperature were 12.0±0.1 deg kbar
−1 for RbHSO
4 and 12.7±0.2 deg kbar
−1 for RbDSO
4. A pressure-induced phase was found for RbHSO
4 above about 7.5 kbar.
View full abstract
-
Kazuo Gesi, Kunio Ozawa, Shunsuke Hirotsu
1975Volume 38Issue 2 Pages
463-466
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The effect of hydrostatic pressure on structural phase transition temperatures above room temperature in CsPbCl
3 and CsPbBr
3 was studied by dielectric measurements at high pressures up to about 8 kbar. The initial pressure coefficients of the transition temperatures are 7.65 deg kbar
−1, 5.2 deg kbar
−1, and 5.4 deg kbar
−1 for the cubic to tetragonal, the tetragonal to orthorhombic, and the orthorhombic to monoclinic transitions in CsPbCl
3, respectively; 11.3 deg kbar
−1 and 12.4 deg kbar
−1 for the cubic to tetragonal and the tetragonal to orthorhombic transitions in CsPbBr
3, respectively. It is predicted that the volume contraction makes the
R25 modes less stable than the
M3 mode in the cubic phases of CsPbCl
3 and CsPbBr
3.
View full abstract
-
Kazuo Gesi, Kunio Ozawa
1975Volume 38Issue 2 Pages
467-470
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
The pressure-temperature phase diagram of Ca
2Ba(C
2H
5COO)
6 was drawn in a pressure range of
p≤7 kbar and a temperature range of −100°C≤
T≤+200°C from dielectric constant measurements. Four pressure-induced phases IV, V, VI, VII were detected besides atmospheric pressure phases of I, II, III. The phase boundaries and the order of transitions between them were determined. At the transition from the high pressure IV phase to V phase, a pronounced dielectric constant peak was observed. The height of the peak decreases with increasing pressure. Ferroelectric hysteresis loops were not observed around the temperature at the peak of dielectric constant.
View full abstract
-
Yoshiaki Kogure, Yoshio Hiki
1975Volume 38Issue 2 Pages
471-479
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
General method to treat the scattering of lattice waves by static strain fields in anisotropic solids was applied to the calculation of thermal conductivity of crystals containing dislocations. The scattering cross widths for edge and screw dislocations in cubic crystals with {111} ⟨110⟩ and {110} ⟨110⟩ slip systems were derived, and the thermal resistivity of the dislocations was calculated using the relaxation-time approximation. The contribution from conducting phonons with different modes was treated separately. Numerical calculation has been done for Cu, Si, and LiF crystals. It was argued that the slow transverse phonons had dominant contribution to the decrease of thermal conductivity due to dislocations. Then the calculated values of the thermal conductivity for Cu and Si were reasonably close to the experimental values, while the discrepancy between the two was still large in LiF.
View full abstract
-
Shin Takeuchi, Eiichi Kuramoto
1975Volume 38Issue 2 Pages
480-487
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Motion of a screw dislocation in a model b.c.c. crystal has been analyzed through the following procedure: (1) Peierls potentials for translations between stable and metastable positions of a screw dislocation are computed atomistically for a model crystal under various shear stresses on various planes, (2) activation energy of double kink nucleation for each translation is calculated using the theory based on the string model, and (3) the velocity and the integrated plane of thermally activated motion of a screw dislocation are analyzed for the steady motion.
τ–χ and ψ–χ relations obtained for a constant velocity at various temperatures show several characteristic features observed on transition b.c.c. metals; τ–
T relations, however, give unrealistic discontinuous curves. τ–χ, ψ–χ and also τ–
T relations typical of less pure b.c.c. metals and alloys are reproduced by using a modified Peierls potential.
View full abstract
-
Mutsuaki Murakami, Susumu Yoshimura
1975Volume 38Issue 2 Pages
488-496
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
Phase transitions were observed in various types of the complex salts of N-(methyl)quinolinium-7, 7, 8, 8-tetracyanoquinodimethan(MeQ–TCNQ). The specific resistivity increased irreversibly by a factor as high as 100 for crystals which included solvent molecules of crystallization and for those which were crystallized in a metastable form without any inclusion. Change in infrared spectra and powder X-ray patterns suggested that the latter crystal was monotropically transformed from a structure which is nearly isomorphous with that of quinolinium(TCNQ)
2 into a stable one which has distortions in linear chains of the stacks of the TCNQ molecules. The resistivity change of the inclusion compounds was caused by escape of the guest molecules which were thought to be originally situated in the channels between the TCNQ columns.
View full abstract
-
Yutaka Takagi, Yoshihiro Ishibashi, Akikatsu Sawada
1975Volume 38Issue 2 Pages
497-504
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Any vector-patterns defined in a unit cell of a crystal can always be decomposed into irreducible patterns. Between an irreducible pattern of dipole moment and an irreducible component of electric field with the same label of irreducible representation, a new concept of irreducible susceptibility can be defined. The inherent structure of the Mitsui theory of Rochelle salt has been reexamined in the light of this new concept and the meaning of its two-sublattice model has been clarified.
View full abstract
-
Yasuo Sakisaka
1975Volume 38Issue 2 Pages
505-508
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
Optical absorption spectra of MnCl
2 and MnBr
2 have been obtained for photon energies between 3 and 7 eV at room and liquid nitrogen temperatures. The spectra show long tails near the onset of the fundamental absorption. Weak but sharp peaks are found at 5.40, 5.85, 6.37, and 6.7 eV in MnCl
2, and at 5.47, 5.81, and 6.36 eV in MnBr
2. The long tails are interpreted as being due to the indirect interband transitions between the valence band arising from p electrons of halogen and the conduction band arising from 4s electrons of manganese. The sharp peaks are assigned to the excitonic transition from the 3d orbitals to the 4s orbitals of manganese ions.
View full abstract
-
Toshihiko Ando, Yuji Kato
1975Volume 38Issue 2 Pages
509-513
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
A general theory of the Faraday rotation, based on a standpoint of the microscopic Maxwell equation, is developed. The formula is expressed in terms of a correlation function of the spatial Fourier components of total electric current. The dielectric constant and the magnetic permeability do not appear explicitly. It is shown that the leading term of the rotational angle of polarized light is represented by refractive index. This is concerned with the Becquerel formula. The present theory also includes a formula for the natural optical rotation.
View full abstract
-
Tomokazu Murai
1975Volume 38Issue 2 Pages
514-518
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
The Dunham spectroscopic constants for 12 of the electronic states of H
2+ are computed theoretically from the adiabatic potentials, which are calculated by the author based on the method presented by Bates
et al. in the Born-Oppenheimer approximation.
View full abstract
-
Nobuo Kobayashi
1975Volume 38Issue 2 Pages
519-523
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Symmetric resonance charge transfer reactions, between atomic ion and atom; Ar
++Ar, and between molecular ion and molecule; N
2++N
2, O
2++O
2 and CO
++CO, were studied by the injected-ion drift tube technique from 0.04 eV to 3 eV in the center of mass system. The experimental cross section for the reaction in Ar
++Ar agrees well with the theoretical one of Rapp and Francis. The experimental results for molecular charge transfer are compared with Rapp and Francis theory taking into account of the Franck-Condon factor.
View full abstract
-
Kiyoshi Kadota, Yozaburo Kaneko
1975Volume 38Issue 2 Pages
524-531
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
The neutralization method for detection of metastable ions is described in detail. This method is based on the detection of metastable atoms resulting from the neutralization of metastable ions through charge transfer process. The metastable atoms are detected with secondary electrons ejected from a metal surface. Various combinations of rare gas ions; He
+, Ne
+, Ar
+, Kr
+, and Xe
+ and neutralizer gases; He, Ne, Ar, Kr, Xe, H
2, N
2, O
2, and CO are studied. The efficiency curves of production of metastable ions obtained for Ar
+m, Kr
+m, and Xe
+m do not depend on the neutralizer gases chosen appropriately, and they are in good agreement with previous works. The efficiency curve of production of long-lived highly excited ions, Xe
+, is also obtained. No metastable state of He and Ne ions was found by this method.
View full abstract
-
Masaharu Takahashi, Kiyoshi Tanaka, Nobumitsu Honjo, Kimio Ohno
1975Volume 38Issue 2 Pages
532-533
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
The modified electron-pair (MEP) and limited configuration interaction (CI) calculations are carried out on the ground state of H
2O with accurate integrals. The minimal Slater orbitals and Slater-type orbitals with optimized exponents are used as bases. It is concluded that the MEP approximation is a good compromise between simplicity and accuracy and is a valid substitute of a limited CI calculation.
View full abstract
-
Ikuji Ishida, Takeo Matsubara
1975Volume 38Issue 2 Pages
534-537
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The frequency spectrum of a monatomic chain with a nearest neighbour force constant which has a Gaussian and a rectangular distribution is studied by means of the Green’s function method. It is shown that the frequency spectra calculated by coherent potential approximation agree pretty well with the results of computer experiments for the corresponding models.
View full abstract
-
Satoru Ohno, Shigeru Tamaki
1975Volume 38Issue 2 Pages
538-543
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
Magnetic susceptibilities, electrical resistivities and thermoelectric powers of liquid In–Bi alloys are measured. The curve of the electron susceptibility versus composition shows a little anomaly near the concentration range of In
2Bi. The corresponding anomaly is also found in the curve of thermoelectric power. Both properties are related to a little complication of the variation of the density of state on going from indium to bismuth.
View full abstract
-
Rei Okasaka
1975Volume 38Issue 2 Pages
544-552
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The time developments of emission spectra and electron density of the plasma generated by an electromagnetically driven shock wave were observed. Helium mixed with a small amount (0.01 to 3%) of H
2, Ar, Kr or CO was used as the test gas. From a comparison of the experimental results with the calculation based on collisional-radiative model it has been concluded that an excited level of atoms or ions goes through the following states of excitation with the progress of ionization relaxation: (I) coronal state, (II) partial stepwise excitation state, (III) complete stepwise excitation state and (IV) partial LTE. The critical electron densities corresponding to the transitions from state II to III and that from III to IV were determined experimentally. The influence of radiation from driving discharge plasma on the relaxation process was also made clear in experiment.
View full abstract
-
Yukio Midzuno
1975Volume 38Issue 2 Pages
553-558
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The number of charged particles which are trapped by an accelerated wave in a plasma is calculated on the basis of a simple model. It is assumed that particles move adiabatically in travelling mirrors of the form
B(
z)=
B0[1+εcos
k[
z−
vph{1+(1⁄2)η
t}
t]] and that the initial velocity distribution is an isotropic Maxwellian. The ratio of the number of trapped particles to the total particle number is found to be
R=(\sqrt8⁄π)ε
1⁄2e
−Af(
y) for ε<<1,
where
A=
mvph2⁄2
T,
y=2η
A⁄ε
kvph and
f(
y) is a monotonically decreasing function of
y(
f(0)=1). The function
f(
y) is presented in a graph as well as a table. As an application of the formula, an estimation is made of the RF power required for sustaining the plasma current in Golovin’s model of the Tokamak fusion reactor.
View full abstract
-
Motomasa Fuse, Setsuo Ichimaru
1975Volume 38Issue 2 Pages
559-567
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
The test-charge problem in a semi-infinite plasma is formulated by taking appropriate account of the electrodynamic boundary conditions in the interface between a plasma and a dielectric medium. The general expression for the dispersion relation of the surface collective mode is thereby obtained. The properties of the surface collective modes associated with the electron plasma oscillations and the ion-acoustic waves are investigated; the criterion for the instability of the ion-acoustic surface mode is analyzed and compared with that of the corresponding volume mode. It is remarked that the field fluctuations observed outside the plasma domain should clearly convey the collective character of the surface mode, while the volume mode loses such a feature because of the screening action of the surface.
View full abstract
-
Tatsuki Ogino, Susumu Takeda
1975Volume 38Issue 2 Pages
568-575
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
A computer simulation for the fast magneto-sonic soliton (FMS soliton) propagating across the external magnetic field is studied under the periodic boundary condition using the fluid model. A theory, which explains the characteristic of the soliton under the periodic boundary condition, is obtained as an extension of the theory by Gardner
et al. The theoretical results agree well with those obtained by the simulation.
Several fast magneto-sonic solitons are formed from a finite amplitude FMS wave. The type of the collision between two solitons depends on their amplitude ratio and they emerge out of the collision preserving their initial shapes and speeds except the phase shifts. The recurrence time and the relationship among the amplitude, speed and width of the soliton simulated agree well with the theory. The number of solitons simulated is about 0.74 times the theoretical one.
View full abstract
-
Choji Nakaya
1975Volume 38Issue 2 Pages
576-585
Published: February 15, 1975
Released on J-STAGE: June 01, 2007
JOURNAL
RESTRICTED ACCESS
To investigate the stability of an axisymmetric vortex flow between rotating cylinders, the development of non-axisymmetric small disturbance is analyzed by a systematic expansion procedure in the amplitude of the vortex. The amplification rate of the disturbance is determined as a power series in the amplitude. The series is truncated with the fourth order in the numerical calculation. It is found that the disturbance grows most rapidly when its axial wave number coincides with that of the vortex. The second boundary representing the stability criterion of the vortex flow is calculated for a small gap of the cylinders. When the ratio of angular velocities is specified, the critical value of axial wave number for the vortex flow is found to be smaller than the critical wave number given by the classical stability problem.
View full abstract
-
Hiroyuki Kano, Toshio Goto, Shuzo Hattori
1975Volume 38Issue 2 Pages
586
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
-
Kay Kohn, Syun-iti Akimoto, Katsuhiko Inoue, Kichizo Asai, Osamu Horie
1975Volume 38Issue 2 Pages
587
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
-
Masayoshi Ohashi, Takejiro Kaneko, Shigeto Miura
1975Volume 38Issue 2 Pages
588
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
-
Naoki Honda, Yasunori Tanji, Yasuaki Nakagawa
1975Volume 38Issue 2 Pages
589
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
-
Takefumi Tsuboi
1975Volume 38Issue 2 Pages
590
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
-
Koichi Matsuura, Toshio Honjo, Ichiro Tsurumi
1975Volume 38Issue 2 Pages
591
Published: February 15, 1975
Released on J-STAGE: May 29, 2007
JOURNAL
RESTRICTED ACCESS
