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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 50, Issue 2
Displaying 1-50 of 59 articles from this issue
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Kozo Satoh, Yoshio Kitaoka, Hiroshi Yasuoka, Shigeru Takayanagi, Tadas ...1981 Volume 50 Issue 2 Pages 351-352
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin-echo signal of 141Pr has been observed for the first time in Pr1−xLaxIn3 where Pr ions are in singlet ground states. The spin-lattice (T1) and spin-spin (T2) relaxation times of 141Pr have been studied at liquid helium temperatures as functions of temperature and composition x. T1 is inversely proportional to temperature and T1T is 270±10 μ sec K, irrespective of the value of x. T2 increases as temperature is decreased from 4.2 K. The value of T2 at 1.2 K is 0.43±0.05 μ sec in PrIn3 and it increases with increasing x. These results are compared with theories relevant to the present system.View full abstractDownload PDF (248K) -
Masasi Inoue, Hoong Kun Fun, Hisao Yagi, Toshiaki Tatsukawa1981 Volume 50 Issue 2 Pages 353-354
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-band spin resonance measurements have been performed from 1.5 to 250 K on degenerate magnetic semiconductors Sn1−xCrxTe (x=1 at.%) with different carrier concentrations ranging from 2×1020 to 5×1020 cm−3. The anomalies in the g-value and linewidth serve to identify the structural phase transition temperature Ts. Our results indicate that Ts is independent of the carrier concentration, in contrast to the results found by other workers.View full abstractDownload PDF (268K) -
Yoshiro Sasaki, Yuichiro Nishina1981 Volume 50 Issue 2 Pages 355-356
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe X-ray and Raman studies in GaSe1−xSx indicate that the intralayer bond length between Ga–Ga atoms and that between Ga-chalcogen atoms are larger in the β-polytype than the respective lengths in γ, whereas the interlayer atomic distance between the chalcogen atoms in the γ-polytype may be equal to or larger than that in β. The lattice parameter, c, reduced to the 2H structure is longer in the β-polytype by 0.075±0.02 Å than in γ, while the parameter, a, is common for both polytypes within the accuracy of our measurements.View full abstractDownload PDF (296K) -
Kazunori Aoki, Kouichi Miyamae, Toshihiko Kobayashi, Keiichi Yamamoto1981 Volume 50 Issue 2 Pages 357-358
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLow-frequency (f<50 Hz) photocurrent noise caused by the breakdown of the low-temperature freeze-out of neutral shallow donors at 4.2 K has been investigated under resonant photoexcitation in n-GaAs. At the onset of the breakdown (∼4 V/cm), the photocurrent noise was selectively generated by the resonant photoexcitation at the photon energies of the (D0, X)n=1,2 lines and the (D+, X) line. The observed results are explained by the current-filament formation.View full abstractDownload PDF (268K) -
Shobu Kaneko, Katsuji Chiyoda, Isao Hirota1981 Volume 50 Issue 2 Pages 359-360
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Grad-Shafranov equation for a prolate spheroidal plasma is solved by using the prolate spheroidal coordinates. The magnetic field in the vacuum region surrounding the plasma is determined by use of the Maxwell equation and the pressure-balance condition on the plasma-vacuum interface. The result obtained in this letter is an exact solution to the magnetohydrodynamic equilibrium equation. The magnetic-field configuration of the spheroidal plasma is found to be considerably different from that of the spherical plasma.View full abstractDownload PDF (248K) -
Kiyotsugu Kano, Toshio Nakayama1981 Volume 50 Issue 2 Pages 361-362
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA procedure of finding an exact periodic solution for a certain type of nonlinear wave equations is described. The exact solutions for some nonlinear wave equations with higher order dispersive term are explicitly presented including a case of ut+uux−u(5x)=0.View full abstractDownload PDF (260K) -
Mark W. Gross1981 Volume 50 Issue 2 Pages 363-368
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA recent argument against the validity of the Lorentz transformation in high energy hadronic collisions based on existing experimental data is examined by reanalysis of the same data in more compatible form. There is found to be no evidence of contradiction with special relativity.View full abstractDownload PDF (588K) -
Minoru Yanokura, Hiromichi Nakahara, Isao Kohno1981 Volume 50 Issue 2 Pages 369-376
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe heavy-ion reactions induced by 115 MeV 14N ions on 58Ni and 64Ni were investigated by a ΔE-E gas counter telescope. The yields of the strongly damped events (Z≥10) were found to be twice to three times larger for the 14N+58Ni system than for the 14N+64Ni system. This isotopic effect was observed not only for the products that exhibit the 1/sin θ distributions but also for those with forward-peaked angular distributions.View full abstractDownload PDF (1032K) -
Yasuyuki Gono, Kotaro Hiruta, Toru Nomura, Masayasu Ishihara, Hiroaki ...1981 Volume 50 Issue 2 Pages 377-383
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn-beam α- and γ-rays following a 208Pb(12C, α2n)214Rn reaction were measured. A level scheme of 214Rn is proposed up to the (8+) state. Two new long-range α-decays in 214Rn were found to de-excite the (6+) and (8+) states. A half-life of the (8+) state was determined to be 7.3±1.5 ns from which the B(E2: 8→6) values was obtained to be 209±63 e2fm4. The reduced α-width γα2 was also deduced as 3.2±1.0 keV for the α-decay from the (8+) state in 214Rn to the ground state in 212Po. Systematic trends of the B(E2: 8→6) and γα2 values of the N=128 isotones, 212Po, 214Rn and 216Ra, are discussed in terms of the simple shell model configurations.View full abstractDownload PDF (700K) -
Georges Mallet1981 Volume 50 Issue 2 Pages 384-392
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSConsiderable controversy about the existence of 14 weak gamma transitions exists between two recent works. We report here the results of γ-ray energy and intensity measurements using four Ge(Li) detectors and three different sources of 110Agm. Besides the γ-rays of 264.4, 341.4, 409.6, 572.7, 603.1, 630.6, 774.8, 1630.0 and 2004.6 keV which were refuted by the last authors, we show eight new γ-rays at 648.2, 666.1, 714.9, 845.8, 927.6, 1050.1, 1465.6 and 1698.5 keV.View full abstractDownload PDF (524K) -
Reiko Takeda1981 Volume 50 Issue 2 Pages 393-400
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe propose a soft quantum lattice model for liquid and solid 4He at 0 K. Our model is capable of representing a compressible solid. Transfer matrix elements to cause O.D.L.R.O and effective repulsive interaction between atoms are assumed to depend on the lattice parameter a with two model parameters p and q as exponents of the “a” dependence of transfer matrix elements and effective repulsive interaction, respectively. We find that they are restricted to 0<p<3, 4.2<q<5 in order to account for the super fluid-normal solid phase change by our model. We examine the possibility of the coexistence of O.D.L.R.O and D.L.R.O (supersolid phase). We find that by our model the supersolid phase is possible when q<4.2, p=2.View full abstractDownload PDF (832K) -
Masatoshi Imada1981 Volume 50 Issue 2 Pages 401-408
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinear response is investigated for the sine-Gordon chain. This is a direct application of a method introduced in a previous paper. The transfer integral method is applied. The Fokker-Planck equation is solved with a kind of decoupling approximation of the phase space distribution function. The frequency dependent mobility is obtained. It has a remarkable peak at a finite frequency and a small finite mobility at ω=0 for an appropriate choice of the damping constant.View full abstractDownload PDF (680K) -
Setsuo Ichimaru, Kazutami Tago1981 Volume 50 Issue 2 Pages 409-412
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigate numerically on the possibility of the soft-mode charge-density-wave (CDW) instability in a strongly coupled plasma, based on the Monte Carlo data for the static structure factor. The result appears to indicate that if an instability of the homogeneous fluid phase should take place at all its critical value of the coupling constant would be much greater than that associated with the first-order transition at the Wigner crystallization. A warning is drawn on the reliability of the “local approximation” in the analysis of the CDW problem.View full abstractDownload PDF (468K) -
Yûichi Tazuke1981 Volume 50 Issue 2 Pages 413-420
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPolycystalline samples of VxCr3−xS4 (0≤x≤3) with defect nickel-arsenide structure were prepared. Almost random distribution of metal atoms was obtained by a proper treatment of the sample. Electrical resistivity was measured between 4.2 K and 295 K. It is metallic for 0.0≤x≤0.4 and 2.75≤x≤3.0, and is semiconductive for 0.6≤x≤2.5. Susceptibility was measured between 4.2 K and 800 K. Small anomalies in resistivity and susceptibility corresponding to Néel temperature were found. In mixed compounds, susceptibility deviates below the room temperature from the high temperature limit of χ=χ0+C⁄(T−θ). This behavior can be interpreted qualitatively that a small moment appears on a V atom and that this moment weakly interacts with Cr moments.View full abstractDownload PDF (900K) -
Kazuo Yamagata, Yoshinari Kozuka, Takashi Morita1981 Volume 50 Issue 2 Pages 421-425
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetization curves at 4.2 K are analyzed on the basis of the 4-sublattice molecular-field theory presented by Yamagata and Sakai recently. The intra- and interlayer exchange fields, Hex and hex, the anisotropy fields, HK+* and HK−*, and other magnetic parameters are estimated by comparing the calculated magnetization curves with the observed ones. The exchange and the anisotropy fields are obtained as follows (in unit of Oe): for the tetrahydrate salt, Hex=1.5×106, hex=4.0×10, HK+*=2.2×102, HK−*=6.0×10; for the bisurea dihydrate salt, Hex=1.7×106, hex=1.8, HK+*=2.7×102, HK−*=4.8×10. These results guarantee the nearly 2-dimensional Heisenberg character of both crystals.View full abstractDownload PDF (592K) -
Hironori Nishihara, Mikio Takano1981 Volume 50 Issue 2 Pages 426-431
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMicroscopic magnetic properties of BaVS3 have been investigated by means of NMR of 51V in the high-temperature metallic phase, in the low-temperature insulating phase which exhibits magnetic order and in the intermediate temperature insulating phase. The hyperfine coupling constant was obtained to be −113±3 (kOe/μB) in the high temperature phase. The temperature dependences of the line shift, the line width and the spin-echo decay time in the intermediate phase suggest that the mechanism of the metal-to-insulator transition around 70 K involves a gradual pairing of the magnetic vanadium atoms in linear chains to form a nonmagnetic state with decreasing temperature. The coexistence of both magnetic and nonmagnetic sites of vanadium atoms and the spin structure in the low temperature phase are discussed.View full abstractDownload PDF (712K) -
Masayuki Kawakami, Satoru Kunii, Kiyoshi Mizuno, Mitsuharu Sugita, Tad ...1981 Volume 50 Issue 2 Pages 432-437
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNMR measurements were performed on the 11B in CeB6 single crystal below 4.2 K and at 77 K using the spin echo technique. The frequency was fixed mostly at 10.7 MHz and the external magnetic field was parallel to the (110) plane. The spectrum at 4.2 K was explained by taking into account the dipolar fields from ferromagnetic moments on Ce atoms. The spectrum in the [111] direction splits into two lines below 3.55±0.05 K, which is interpreted tentatively by the occurence of the G-type antiferromagnetic ordering with magnetic moments parallel to the external field and with the maximum component 0.1 μB/Ce around 2.4 K. The Knight shift for the [111] direction increases with decreasing temperature from +0.49±0.06% at 4.2 K to +2.02±0.25% at 1.4 K. The angular dependence of the spectrum at 2.6 K was explained to some extent by assuming the G-type and ferromagnetic components of magnetic moments. However, the spectrum at 1.8 K could not be explained by those components.View full abstractDownload PDF (680K) -
Mitsuhiro Inazumi, Yasuaki Nakagawa, Midori Tanaka, Noboru Kimizuka, K ...1981 Volume 50 Issue 2 Pages 438-444
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEffects of oxygen deficiency on magnetic properties of YFe2O4−x (x=0.00, 0.031, 0.040, 0.055 and 0.095) have been investigated by magnetization and Mössbauer effect measurements. When x≥0.055, the compounds show so-called parasitic ferrimagnetism below 210∼220 K. When x≤0.031, on the other hand, they undergo two successive first-order phase transitions at around 230 K and 190 K, without any thermoremanence at any temperature. The compound with x=0.040 exhibits intermediate characteristics. Lattice defects introduced by the oxygen deficiency are considered to play an important role in the disappearance of the first-order transitions and the appearance of the parasitic ferrimagnetism.View full abstractDownload PDF (820K) -
M. Maurer, M. C. Cadeville1981 Volume 50 Issue 2 Pages 445-450
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe presence of short range order in dilute ternary FeSbT alloys (T=Ni, Co, Cr) is investigated by means of NMR at 121,123Sb and 59Co nuclei. Satellite lines are observed on each spectrum. The assignment to well defined atomic pair configurations are deduced from their positions and from the concentration dependences of their relative areas. Sb–Co and Sb–Cr first neighbor pairs are observed in a random proportion whereas Sb–Ni first and third neighbor pairs are short range ordered, with an attractive Sb–Ni interaction. These results are discussed in connection with other experimental data.View full abstractDownload PDF (664K) -
Takao Kohara1981 Volume 50 Issue 2 Pages 451-453
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNMR signals of 27Al in the commensurable state of CrAl alloys were observed at liquid He temperatures. The hyperfine field at Al site due to the magnetic moment of Cr atom is about 32 kOe/μB. The hyperfine field of 27Al increases with increasing Al concentration almost in proportion to the average magnetic moment. The nuclear spin-lattice relaxation time, T1, has been also measured under the same condition. The product of T1 and the temperature, T1T, increases with Al content.View full abstractDownload PDF (360K) -
Hatsuo Tange, Takeshi Yonei, Mitita Goto1981 Volume 50 Issue 2 Pages 454-460
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of forced volume magnetostriction dω⁄dH for Ni1−xCrx alloys (x<0.1) has been measured by strain gauge technique. The values of dω⁄dH for Ni, 1.9 and 3.9 at%Cr–Ni change their sign from positive to nenative at T⁄Tc=0.7, 0.75 and 0.85, respectively. Those for other Ni–Cr alloys measured are positive at all temperatures. The pressure coefficients of the magnetic moment per unit mass at 0 K, d ln σs0⁄dp, determined from the present data by using thermodynamic relations are all negative and become larger in the absolute value with increasing x. These results suggest that the s-d transfer is dominant according to Mathon’s procedure based on the itinerant electron model. The pressure derivatives of Tc, dTc⁄dp, obtained from the present data agree with direct measurements and their sign changes from positive to negative at about 6 at%Cr–Ni with increasing x.View full abstractDownload PDF (816K) -
Hideki Yamagata1981 Volume 50 Issue 2 Pages 461-468
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of 55Mn NMR frequency has been studied in dilute NiMn alloy from 4.2 to 520 K by the spin echo method. The 55Mn NMR signal associated with the parallel moment to the host consists of three parts: Mn0, Mn1 and Mn2 atoms that have 0, 1 and 2 Mn atoms in their nearest neighbours, respectively. The temperature dependence of respective NMR frequencies ν(T) is described by a common function Δν(T)⁄ν(0)=0.58×(T⁄TCi)2.39, which indicates that each moment behaves as if it has different Curie temperature TCi depending on the different environment irrespectively of the Mn concentration in dilute Mn system. TCi’s of Mn0 and Mn1 atoms are determined as 610 and 570 K, respectively. ν(T) of 55Mn in FeMn1.5% and CoMn3% alloys are also described by this function, where TCi of Mn0 atoms in FeMn1.5% and CoMn3% alloys are 505 and 525 K, respectively. The ratios of the effective exchange interaction parameters are inferred directly from these values of TCi.View full abstractDownload PDF (920K) -
Yasuo Endoh, Yasuhisa Noda, Masashi Iizumi1981 Volume 50 Issue 2 Pages 469-475
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSUsing inelastic neutron scattering the phonon dispersion relations in a single crystal of face centered cubic Fe0.7Mn0.3 have been determined at several temperatures above and below the Néel temperature of 412 K. The shifts of the frequencies of the [110]T1 mode below TN have been observed, which eventually gives the elastic softening similar to the previous observation in the typical ferromagnetic Invar of Fe0.65Ni0.35 or Fe0.72Pt0.28. Lattice dynamical features in this material are discussed with respect to the Invar characters in the f.c.c. FeMn alloys.View full abstractDownload PDF (668K) -
Shigeki Hoshino, Yoshimasa Kumashiro, Shuzo Takano1981 Volume 50 Issue 2 Pages 476-481
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy the power spectrum analysis of the quantum oscillations of the sound velocity in antimony, the geometrical factors G of the energy surfaces were studied. For holes it was found that G is ellipsoidal for the light mass directions. The coupling constants of holes with the sound wave were determined from the peak values of the power spectrum as follows: |Cxd|2=20.0±1.0, |Cxf|2=1.6±0.3, |Cyd|2=5.65±0.30, |Cyf|2=5.95±0.40 and |Czd|2=0.55±0.05 eV2. It was also found that for electrons G differs from the ellipsoid. The coupling constants were determined under the assumption that the densities of states of electrons and holes at zero magnetic field are given by the ellipsoidal models. The results are: |Cxa|2=18.2±3.6, |Cxb|2=8.66±1.7, |Cya|2=22.6±5.0, |Cyb|2=2.78±0.55 and |Cza|2=0.475±0.043 eV2.View full abstractDownload PDF (780K) -
Masahiko Tokita, Eijiro Haga1981 Volume 50 Issue 2 Pages 482-489
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Hamiltonian for the indirect interaction between nuclear spins, which arises from the Fermi contact, dipole and quadrupole interactions between nuclei and conduction electrons, is derived, in which cross-interaction terms of various types appear. It is shown that a part of the indirect interaction arising from the above quadrupole interaction just cancels the direct quadrupole interaction between nuclei. The second moment of the central line of Au197 is calculated by taking account of the effect of the strained crystals on the quadrupole moment and by making use of the results obtained in our previous paper for the nuclear spin-lattice relaxation time. It is found that the main contributions to the line-width come from the exchange and pseudo-dipole interactions.View full abstractDownload PDF (796K) -
Shinya Wakoh1981 Volume 50 Issue 2 Pages 490-497
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA theoretical momentum density distribution of the electrons in Mg metal is calculated by the APW method and a momentum density of the electrons sampled by the thermalised positron is also calculated. Compton profiles and angular correlation curves of the positron annilhilation radiation are calculated for three principal directions. In order to investigate some origins of the anisotropy of the profiles, the momentum density in the ΓKM plane is examined.View full abstractDownload PDF (2148K) -
Nobuhiro Shiotani, Takuya Okada, Hisashi Sekizawa, Shinya Wakoh1981 Volume 50 Issue 2 Pages 498-504
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAngular correlations of positron annihilation radiations in Mg are measured. The observed angular correlations are interpreted in terms of the independent particle model (IPM). The observed crystalline anisotropies and fine structures of the angular correlations are explained very well by the IPM. However, the overall shapes of the angular correlations are not well explained in terms of the IPM alone. By introducing empirical enhancement factors the disagreement is greatly reduced.View full abstractDownload PDF (904K) -
Mikio Tsuji, Etsuo Matsuo, Kouichi Hiranaka1981 Volume 50 Issue 2 Pages 505-514
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dispersion relations of the extraordinary high-frequency waves are investigated for metals and semiconductors in external magnetic fields of the Voigt configuration. By assuming the collisionless free electron model, the ‘real lines’ i.e., the complex wave vectors (q) which give real frequencies are calculated numerically. Special cases of small and large |q| are considered in detail.View full abstractDownload PDF (952K) -
Toshiaki Tatsukawa1981 Volume 50 Issue 2 Pages 515-519
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSESR measurements at V-band region have been made on Pb1−xMnxTe (0.6≤x\lesssim3 at.%) in the temperature range, 2∼300 K. The temperature dependence of the linewidth ΔH consists of a temperature-dependent term and a temperature-independent residual term. The variation of the temperature coefficient of the linewidth with Mn density strongly supports the predominance of the bottleneck effect arising from the s-d exchange interaction between the Mn spins and the carrier spins. Exchange narrowing as well as dipolar broadening have been found to be effective, depending on the Mn density.View full abstractDownload PDF (560K) -
Takenari Goto, Atsuo Kasuya1981 Volume 50 Issue 2 Pages 520-524
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have measured the resonant Raman scattering by two Eu-phonons in the A-exciton region of a layer semiconductor HgI2. We find sharp peaks in the Raman scattering efficiency at the incident photon energies equal to the exciton levels up to n=4. The binding energy is estimated to be 104.4 cm−1 from the fit for the n≥2 excitons to hydrogenic series. This value is very much smaller than the observed binding energy of the 1S exciton, 256 cm−1. Such a large discrepancy between the experimental and calculated binding energies is interpreted in terms of the exciton-LO phonon coupling characteristic of a layer semiconductor. From the diamagnetic shift of these peaks, we obtain the reduced masses parallel and perpendicular to the c-axis as 0.31 m0 and 0.24 m0, respectively.View full abstractDownload PDF (680K) -
R. Ghosh, R. K. Datta1981 Volume 50 Issue 2 Pages 525-530
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe attenuation coefficient α in db/cm at different temperatures and frequencies has been calculated from Lamberts’ absorption formula for three different liquids such as acetone, methylethylketone and diethylketone. The position of maximum absorption for all the three liquids shifts towards higher frequency with the increase of temperature and towards lower frequency with the increase of the number of CH2 groups in the molecules. Further it is observed that the height of the absorption peak for CH3COCH3 and C2H5COC2H5, which contain identical alkyl group increases with decrease of temperature where as in the case of CH3COC2H5 the height of the absorption peak instead of increasing diminishes with lowering of temperature. This may be due to the fact that the methyl compound in particular show certain abnormality as has been reported. In this paper the abnormality has been assumed to be due to the fact that at lower temperature the molecules abruptly form groups which produces a resultant electric moment less than that of single molecule.View full abstractDownload PDF (552K) -
Mitsuo Wada, Akikatsu Sawada, Yoshihiro Ishibashi1981 Volume 50 Issue 2 Pages 531-537
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe low temperature phase transition of Rb2ZnCl4 was studied by measuring the Raman spectra, dielectric constants and spontaneous polarization. A soft mode (the B mode), whose frequency tends to zero as T3=74.6 K is approached from below, was observed in addition to the totally symmetric soft mode which had been already observed by Francke et al. No remarkable anomaly in the dielectric constants was seen around T3. The spontaneous polarization along the a-axis was observed both below and above T3. From these experimental results and group-theoretical consideration, the phase transition at T3 is considered to be induced by a doubly-degenerate phonon mode at the Brillouin zone boundary of the phase III, and the space group of the phase IV below T3 is guessed to be P2111 (Z=24).View full abstractDownload PDF (700K) -
Yoshihiro Goto1981 Volume 50 Issue 2 Pages 538-542
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric constant of ferroelectric Pb5Ge3O11 powders has been investigated experimentally; low frequency dielectric dispersion around 10 kHz has been observed. The experimental result has been compared with that of the model theory by Nicollian and Goetzberger for a dielectric dispersion which is associated with the electron transition in surface state of the crystal. The qualitative agreement between the present experimental result and the theoretical one suggests an important role of the surface state of Pb5Ge3O11 powder playing on the dielectric dispersion at low frequencies.View full abstractDownload PDF (452K) -
Masanori Cho, Toshirou Yagi1981 Volume 50 Issue 2 Pages 543-550
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Brillouin scattering spectra of K2SeO4 were observed as a function of temrerature in a ranse from 80 K to 770 K which includes the three successive phase transition points T1 (745.0 K), T2 (129.5 K) and T3 (93.0 K). The Brillouin frectuency shifts Just below the hexasonal-orthorhombic (prototype-normal) transition point T1 show a softening of the lonsitudinal acoustic (LA) mode propagating along the [100] direction. The index 2β=0.64±0.02 was obtained in a phenomenological treatment of the anomalous part of the elastic stiffness constant C11 derived from the frequency shift. At the normal-incommensurate transition point T2, the LA mode propagating along the [001] direction shows an anomaly of C33 which is well described in terms of the mean-field theory. Near the incommensurate-commensurate transition point T3, the spectra do not show any anomalous temperature dependence.View full abstractDownload PDF (992K) -
Masaru Kasahara, Itaru Tatsuzaki1981 Volume 50 Issue 2 Pages 551-554
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBrillouin scattering spectra in the geometry x(y, x)y were measured in mixed crystals KDP1−xDKDPx for x=0.04, 0.08, 0.23. 0.46 and 0.72. A spectrum consists of a broad component owing to polarization fluctuation and a phonon peak. On the assumption that polarization fluctuation is of Debye type, a relaxation time of an individual dipole is evaluated by fitting the calculated spectrum to an experimental one in a polarization fluctuation-acoustic phonon coupling system. The relaxation time increases from 0.19×10−12 sec at x=0.04 to 1.03×10−12 sec at x=0.72.View full abstractDownload PDF (532K) -
Shigeo Suzuki, Hidemi Murakami, Mieko Takagi1981 Volume 50 Issue 2 Pages 555-562
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-ray diffraction topographic study of the partly electroded plates of ferroelectric NaNO2 crystals (S. Suzuki and M. Takagi: J. Phys. Soc. Jpn 32 (1972) 1302) has revealed many small regions where the half way state of the rotational motion of NO2 radicals at the time of the polarization reversal had been quenched. By making use of the sensitive dependence of infrared ν2 absorption on the orientation of the NO2 radicals, rotation angle of NO2 at the regions was estimated through the topographic (point by point) measurements of the infrared absorption. Topographic coincidence between X-ray topographs and infrared absorption was confirmed. Present study is the first work which had detected orientational change of molecules in a single crystal by using infrared absorption measurements in cooperation with X-ray topography.View full abstractDownload PDF (1808K) -
Takashi Iwasaki, Yusuke Nakamura, Hisawo Wakabayashi1981 Volume 50 Issue 2 Pages 563-568
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectron spin resonance spectra of 151Eu2+ ions in NaF, KF and RbF are observed. The complex consists of an Eu2+ ion and a cation vacancy at one of its nearest neighbour sites. The experimental values of the spin Hamiltonian parameters b20 and b22 are as follows; 612 and 699×10−4 cm−1 in NaF, 528 and 382×10−4 cm−1 in KF, 436 and −441×10−4 cm−1 in RbF. Those values are considered after the point charge model. Superhyperfine structure lines are not observed.View full abstractDownload PDF (588K) -
Kin-ichi Masuda, Akikazu Sato1981 Volume 50 Issue 2 Pages 569-576
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA tight-binding type electronic theory is used to calculate the core structure and core energy of a (1/2)⟨111⟩ screw dislocation in bcc transition metals (α-Fe, Nb and W). This calculation takes into account the d-function anisotropy of the transition metal d-band as well as the short-range repulsive energies. It is shown that the d-band effect (d-orbital anisotropy) and the next nearest-neighbour interactions are of great importance for the calculation of the core structure and core energy of the screw dislocation.View full abstractDownload PDF (932K) -
Kozo Hoshino1981 Volume 50 Issue 2 Pages 577-581
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theory of the surface segregation of alloys is proposed on the basis of the Einstein model for the lattice vibration and the tight-binding model for the electronic states. lt is shown by applying the theory to the monolayer model that the surface phonon softening affects the composition dependence of the enrichment by one component at the surface of alloys quantitatively and even qualitatively in some cases.View full abstractDownload PDF (628K) -
Takeyuki Okada1981 Volume 50 Issue 2 Pages 582-591
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhotochemical conversion and reorientation of V centers in KI crystals colored additively or electrolytically are studied at temperatures of 19–140 K. When V centers are dissociated at 19 K by irradiation with light in the 270 nm region, I2−-like centers are formed. The I2−-like centers begin to bleach at about 40 K forming centers of another type which possess ⟨110⟩ symmetry and give rise to absorption bands with peaks at 358, 430, 625 and 808 um. The V2 and V3 bands observed in quenched crystals are composed of absorption bands due to two kinds of V centers with ⟨110⟩ and ⟨111⟩ symmetries. Besides these centers, other V centers with ⟨100⟩ or near-⟨110⟩ symmetry are also formed by optical excitation; after the optical excitation, dipoles of V centers reorient into proper directions at a given temperature of the sample. Based on the model of the I3− molecule-ion bound to a cation vacancy, possible structures of the four kinds of V centers are discussed.View full abstractDownload PDF (1428K) -
Koichi Yamada, Yukio Fukuda, Tsuneo Hashi1981 Volume 50 Issue 2 Pages 592-601
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe population gratings were created by two intersecting resonant light pulses in the ground state 32S1⁄2 and the excited state 32P1⁄2 in sodium vapor, and their developements in a static magnetic field were monitored by the diffraction of the resonant probe pulse. Intensity modulations of the diffraction signals at the Zeeman frequencies (Zeeman beats) were observed, which are due to the oscillation of the LIPG’s. The detailed analysis of the creation, detection and the time development of the LIPG was made in a simple model system with total angular momentum J=1⁄2 in both the ground and the excited states. The observed beat patterns were compared with the theoretical calculations including the effects of hyperfine interaction in both states. Polarization characteristics were also examined. The agreement between theoretical predictions and experimental results was quite satisfactory.View full abstractDownload PDF (1168K) -
Hiroshi Tokumoto, Madoka Tokumoto, Takehiko Ishiguro1981 Volume 50 Issue 2 Pages 602-605
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe photoacoustic (PA) spectra in several semiconductors such as Si, Ge, InSb, GaAs, and GaP have been measured in the region of wavelength shorter than the fundamental absorption edge, where the PA signal is regarded to be independent of the absorption coefficient. We found the dips in the PA spectrain this region which can be ascribed to the optical reflection effect inherent to the band structure.View full abstractDownload PDF (464K) -
Shigeru Nakayama1981 Volume 50 Issue 2 Pages 606-608
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe purpose of this paper is to interpret inverted signals in polarization spectroscopy of sodium vapour by using a model of four-level system. It is shown that the inverted rotation of polarization stems from the occurrence of cross-over resonances because of the high multiplicity of Zeeman sublevels.View full abstractDownload PDF (324K) -
Shigeru Nakayama1981 Volume 50 Issue 2 Pages 609-616
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe aim of this paper is to present detailed theory of polarization spectroscopy of Na in the case of a slow relaxation rate of a lower state involved in a resonant transition. An interpretation of the signal in such a polarization spectroscopy is given by combining the theory of birefringence and dichroism with a first-order theory of velocity-selective optical pumping in a four-level system. Because of the high multiplicity of Zeeman levels, the signal is complicated by the occurrence of cross-over resonances in addition to the principal resonances. This interpretation is in good agreement with the experimental results which have been already published about the Na D1 line.View full abstractDownload PDF (872K) -
Kei Nakachi, Ken Ishikawa, Hideo Suzuki1981 Volume 50 Issue 2 Pages 617-622
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe study such a singlet excited state of free retinal or retinal Schiff-base that the bond lengths differ from those of the ground state, and that the emission of light takes place from this “deformed” excited state.
The ground state of retinal is calculated by the ASMO–SCF–CI method for π-electrons. Then, the deformed excited state of retinal is calculated in consistence with our previous work, varying respective bond lengtlas and Coulomb integrals with bond orders and electron densities of the excited state. And it is shown that the excited state is characterized by the bond character opposite to that of the ground state, and also by the opposite character of charge distribution.View full abstractDownload PDF (744K) -
Kiyoshi Ueda, Yasuo Ashizawa, Kuniya Fukuda1981 Volume 50 Issue 2 Pages 623-631
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMore than 20 collision-induced dirole (CID) transitions (4s2−4sns with 7≤n≤9, −4snd with 5≤n≤12, −4snf with 4≤n≤8, etc.) have been observed in the absorption spectrum of calcium below 2400 A in the presence of xenon or krypton. Some of them have been also observed in the presence of argon, neon or helium. The measured shifts and the effective oscillator strengths show a close correlation with low-energy-electron-scattering parameters of the rare-gas atoms. Present theoretical calculation of the effective oscillator strengths for 4s2−4snd (8≤n≤12) reproduces the dependence of the measured oscillator strengths on the scattering lengths of the rare-gas atoms and on the effective principal quantum numbers of the upper D levels, but the calculation gives larger values by a factor of about 4 than the experiment.View full abstractDownload PDF (1024K) -
Akio Itoh, Fumio Fukuzawa1981 Volume 50 Issue 2 Pages 632-637
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEquilibrium charge distributions of 0.7–2.0 MeV helium beams have been measured in target gases H2, He, N2, O2, CO2, CH4, C2H6 and C3H8. Present results are in fairly good agreement with other experimental data in H2, He and N2. Absence probabilities of bound electrons in He0 and He+ projectiles are estimated by using the equilibrium fractions and the theory of Dmitriev is supportable in this energy region. Average charges in these gases have the following relation;
\barq: H2>CH4≅C3H8>C2H6>N2>CO2>O2>He.
The maximum difference of \barq among these gases is about 0.27 units of charge. The high average charges in hydrogen-containing molecules are attributed to the small capture cross sections.View full abstractDownload PDF (684K) -
Masamichi Hikosaka, Shunpei Tamaki1981 Volume 50 Issue 2 Pages 638-641
Published: February 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCrystallization process of fractionated polyethylene (PE) about 10 μm thick from liquid at high pressure was observed by optical microscope and X-ray method. The needle-like crystal obtained was unchanged in the shape except for appearing of striation through the hexagonal-orthorhombic transition and it gave spotty X-ray pattern corresponding to the a*–b* plane of reciprocal lattice of hexagonal and orthorhombic form. The direction of its long axis coincided to that of [010] in the hexagonal form and to that of [010], [110] or [\bar110] in the orthorhombic form. These results suggests that the needle-like crystal was composed of rather bulky single crystals of μm dimension as compared with the usual polymer single crystals of 100 A thick and that the formation of the hexagonal needle-like crystal corresponds to that of extended chain crystal of PE.View full abstractDownload PDF (760K) -
Kanemitsu Katou1981 Volume 50 Issue 2 Pages 642-646
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the transport equations for the electromagnetic wave energy density Wk and momentum density Pk in transparent, dispersive, space- and time-varying media are given by dWk⁄dt=ωk−1∂ωk⁄∂t Wk+2γkWk and by dPk⁄dt=−k−1·∂ωk⁄∂rPk+2γkPk, respectively, where d⁄dt denotes the total time derivative along the ray trajectory and γk is the growth rate. The terms ωk−1∂ωk⁄∂t Wk and −k−1·∂ωk⁄∂rPk result from the fact that the wave energy and momentum density are not adiabatic invariants in space- and time-varying media. It is assumed that the geometric optics approximation and the nonlocal lincar response theory are valid.View full abstractDownload PDF (516K) -
Tsuyoshi Imai, Masao Okamoto, Takashi Nagashima1981 Volume 50 Issue 2 Pages 647-654
Published: February 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy use of a one-dimensional tokamak transport simulation code, numerical estimations are performed of the heating of the lower hybrid range of frequencies (LHRF) in JET-2 tokamak. The coupling of launched electromagnetic wave into a plasma, propagation and absorption of the wave are considered within the framework of linear theory and the resultant energy deposition is incorporated into the transport code. The result of simulation gives the maximum heating efficiency of the value of 2∼3 eV/kW, when the turning point of lower hybrid wave is located near the center of the plasma column, whereas 1∼1.5 eV/kW in the experiment. It is found that the density window of the theory is narrower than that of the experiment. The importance of two-dimensional propagation and the nonlinear absorption of waves is indicated.View full abstractDownload PDF (1112K)