Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 40, Issue 6
Displaying 1-47 of 47 articles from this issue
  • Yoshiyuki Watase, Saburo Homma, Toshio Kitagaki
    1976 Volume 40 Issue 6 Pages 1531-1536
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The energy spectra of photoproduced π+ and π from C, Al, Ca, and Cu have been measured at 90° in the laboratory system using 250-MeV bremsstrahlung. The pions were detected by a magnetic spectrometer. The π⁄π+ yield ratios obtained from the measured spectra and the A-dependence of the cross sections are discussed as a function of the pion kinetic energy.
    Download PDF (624K)
  • Hiroaki Ueno, Takemi Nakagawa, Mamoru Baba, Jirohta Kasagi, Hikonojo O ...
    1976 Volume 40 Issue 6 Pages 1537-1540
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Continuous triton energy spectra from the (3He, t) reaction on 9Be were measured and well explained by the four-body breakup process including Coulomb penetrability. The integrated cross section of the continuum between 10° and 90° is of the order of 15 mb at E3He=6.70 MeV.
    Download PDF (504K)
  • Kohji Miura, Yukio Hiratate, Teruo Suehiro
    1976 Volume 40 Issue 6 Pages 1541-1546
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The low-lying neutron states in 53Mn are investigated by the 55Mn (p, t)53Mn reaction at Ep=51.9 MeV. Angular distributions are obtained over an angular range of θCM=6.2−52.7° for peaks below 3.77 MeV in 53Mn, and compared with the zero-range DWBA calculations to deduce L values and transition strengths. The spin-parity of the 2.27 MeV state is determined to be 5⁄2 from an L=0 shape of the angular distribution. Absolute cross sections leading to states in 53Mn are compared with those for the 56Fe (p, t)54Fe and 54Cr (p, t)52Cr reaction.
    Download PDF (652K)
  • Takasu Hashimoto, Yasuhiro Maeda
    1976 Volume 40 Issue 6 Pages 1547-1554
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The spin relaxation process in (Fe0.06Mn0.60Zn0.34)Fe2O4 has been investigated near Tc in the paramagnetic region by magnetic susceptibility measurement in a high frequency (MHz) magnetic field. This process is polydispersive and the frequency dependence of magnetic susceptibility is explained by a similar formula to the one introduced by Cole and Cole, and Matsubara and Yoshimitsu. Moreover, it is observed that the relaxation process becomes more polydispersive with the approach of Tc. These experimental results are explained qualitatively by using the Glauber model and the molecular field approximation.
    Download PDF (880K)
  • Kenichi Nanbu
    1976 Volume 40 Issue 6 Pages 1555-1558
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The time-dependent behavior of the vibrational population distribution of a system of anharmonic oscillators relaxing in isothermal heat-baths has been studied numerically. The relaxation caused by suddenly lowering the translational temperature of the system, which is initially in complete equilibrium at a high temperature, has been considered. Use of the Bailey’s integration method made it possible to pursue the relaxation process up to the final equilibrium. The results show: (1) a total inversion of the population distribution appears during the relaxation process only when the heat-bath temperature is much lower than the initial temperature of the system; (2) the lower the heat-bath temperature is, the greater part of the vibrational energy relaxes at an early stage of relaxation.
    Download PDF (460K)
  • Ikuo Maeda, Hiroshi Yamauchi, Hiroshi Watanabe
    1976 Volume 40 Issue 6 Pages 1559-1563
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetization measurements of f.c.c. Ni–Co alloys using pendulum-type magnetometer have been made from liquid He temperature to room temperature. Magnetization vs temperature curves have been analysed on the basis of the spin wave theory. The exchange integral J and the exchange stiffness constant D are estimated. The composition dependence of D is not consistent with that obtained by Hinoul et al. from spin wave resonance experiments nor with that obtained by Wakoh from the calculation on the basis of itinerant electron model. The experimental results seem to support that the contributions to the spin wave dispersion relation from the itinerant and localized characters of electrons are additive as shown by Englert et al. and Yamada et al. The role of the inter-atomic exchange interaction in Ni–Co alloys seems to be important in order to explain the observed values of D.
    Download PDF (552K)
  • Masataka Koyama, Hiroyoshi Suzuki, Takashi Watanabe
    1976 Volume 40 Issue 6 Pages 1564-1569
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetic and thermal properties of Cu(NO3)2·C4H4N2 have been investigated. As expected from crystal structure, the Heisenberg linear chain like properties have been found and the antiferromagnetic intrachain interaction is determined as |J|⁄k≅5.5 K. Long range ordered state has not been found down to 0.18 K (0.04|J|⁄k).
    Download PDF (704K)
  • Kenichi Kojima, Takeshi Komaru, Tadamiki Hihara, Yoshitaka Koi
    1976 Volume 40 Issue 6 Pages 1570-1574
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The hyperfine (hf) fields at isolated Eu2+ ions in alkaline earth chalcogenides are measured by ESR method to make a separation between the core polarization and transferred contributions to the hf field at the Eu nucleus in Eu-chalcogenides.
    The Eu hf fields, which are assumed to be equal to the core polarization fields in Eu-chalcogenides, are (−)299, (−)300, (−)292 and (−)283 kOe in SrO, SrS, SrSe and SrTe, respectively. Using NMR data, the transferred hf fields at Eu nuclei are estimated as −8, −32, −38 and −30 kOe in the ferromagnetic states of EuO, EuS, EuSe and EuTe, respectively. The variation of the transferred hf field from EuO to EuTe is correlated to the exchange mechanism involving 5d and 6s electron states.
    Download PDF (708K)
  • Keiji Osaki, Norikiyo Uryû
    1976 Volume 40 Issue 6 Pages 1575-1583
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The anisotropic g-factors of Co2+ ion in the crystal field of orthorhombic symmetry have been calculated taking into account the effects of the excited orbital states. Following the same procedure as developed by Abragam and Pryce, the admixture of the excited orbital states to the ground state can be comprized in effective Landé factors for the fictitious orbital angular momentum l(=1). The dependence of the g-factors on the crystal field parameters has been calculated and compared with some experimental data.
    Download PDF (776K)
  • Kazukiyo Nagata, Tadashi Hirosawa
    1976 Volume 40 Issue 6 Pages 1584-1592
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The angular dependence of the EPR linewidth in quasi-one-dimensionally exchange-coupled CsMnCl3·2H2O and α-RbMnCl3·2H2O is shown to provide a close examination of the decoupling approximation to correlation functions of four spins in a chain. The linewidth in both compounds are, for the most part, due to the secular part of the intra and interchain magnetic dipole interaction. The angular anisotropy can, however, be explained only by recognizing the different decay rates for the intra and interchain correlations. A theory which accounts a proper correction for the decoupling of intrachain correlations is shown to reproduce closely the experimental results at X-band.
    Download PDF (980K)
  • Kazuo Yamagata, Yoshinari Kozuka, Eiichi Masai, Masahiro Hayama
    1976 Volume 40 Issue 6 Pages 1593-1596
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Measurements of magnetization up to 20 kOe were made in three crystal planes at 4.2 K. The weak ferromagnetism was attributed to the inequivalence of g-tensors of two copper ions in the unit cell. A jump or a bend of magnetization curve was observed on the phase boundaries reported in proton resonance experiments. A transition mechanism at the boundaries is presented based on the 2-dimensional structure of this crystal.
    Download PDF (368K)
  • Yoshikazu Ishikawa, Keisuke Tajima, P. Radhakrishna
    1976 Volume 40 Issue 6 Pages 1597-1603
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetic form factor and the moment distribution in the Pd2MnSn have been studied by polarized neutron diffraction. The magnetic form factor of the Mn atom is in good agreement with that for Mn2+ ions calculated by Watson and Freeman. No asphericity of the form factor has been found. A small positive polarization of Pd atoms (\lesssim0.1μB) has been observed.
    Download PDF (820K)
  • Nagao Ohata
    1976 Volume 40 Issue 6 Pages 1604-1610
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The effects of electron correlation on the magnetic interaction between a pair of donors are investigated on the basis of a simple model. The model is a system of two electrons interacting with a short-range repulsive force in the conduction band of a semiconductor containing two donor-type impurities, whose potential is assumed to be deep enough to have only one bound state. When the potential is not so deep, the pair forms a H2-like molecule, which can be ionized by a finite value of the repulsion. When the potential is deeper, each donor may be considered to be a paramagnetic impurity; the coupling between them is always antiferromagnetic.
    Download PDF (732K)
  • Sumio Terakawa, Ayao Okiji
    1976 Volume 40 Issue 6 Pages 1611-1620
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The theory of two-magnon Raman scattering is extended to the spiral magnets in the presence of an applied field along the spiral axis. Applications are made to MnO2 and VF2. Calculations are also done for the spectra by the spin excitations through the off diagonal exchange mechanism of the spin pairs along the c-axis, which is ineffective in the simple antiferromagnets like MnF2.
    Download PDF (1036K)
  • Jun Akimitsu, Yuji Ito
    1976 Volume 40 Issue 6 Pages 1621-1629
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetic form factor of Cu2+ in the ferromagnet K2CuF4 has been measured by means of the polarized neutron diffraction technique. The observed form factor is in good agreement with the calculated one based on the orbital ordered wave functions in the tetragonal crystalline field. In the calculation the effects of covalency and of spin-orbit interaction are taken into account.
    Download PDF (964K)
  • Tadahiro Takigawa, Fuminori Fujimoto
    1976 Volume 40 Issue 6 Pages 1630-1636
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    An energy loss peak at 2 eV in the spectrum of electrons transmitted through thin copper films is studied by using energy analyser with high resolution of 50 meV. The observed energy loss spectra are in good agreement with calculated ones. From a theoretical consideration, it is concluded that the 2 eV peak is caused from the excitations of surface plasmon strongly affected by surface oxide layers.
    Download PDF (716K)
  • P. R. Sarode, A. R. Chetal
    1976 Volume 40 Issue 6 Pages 1637-1639
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    X-ray K absorption studies of cobalt in the pure metal and in the compounds TbCo5, DyCo5, HoCo5 and ErCo5 have been carried out using a 40 cm Cauchois type bent crystal spectrograph. The K-absorption edge of cobalt in these compounds lies on the lower energy side with respect to its position in pure cobalt. The chemical shifts have been found to depend upon the number of covalent electrons participating in bonding.
    Download PDF (384K)
  • Koichi Shindo, Hisashi Nara
    1976 Volume 40 Issue 6 Pages 1640-1644
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The validity of the multivalley effective mass equation which has been conventionally used by many authors is examined. It is shown that the equation will not describe the intervalley mixing properly. An alternative equation which replaces the conventional equation is derived and discussed. Essential features of the new equation are: the lack of the intervalley mixing via kinetic energy, and the modification of impurity potential by the product of the periodic parts of the Bloch functions at the conduction band minima. Importance of the effect of anisotropy of the effective mass is discussed.
    Download PDF (616K)
  • Hiroshi Kudo
    1976 Volume 40 Issue 6 Pages 1645-1653
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The dechannelling of fast ions by lattice distortion in crystals is studied by a simple modification of the continuum model of channelling. The results show that the dechannelling cross section by a dislocation is proportional to the square root of the ion energy. The dechannelling probability of He+ and H+ ions near dislocations in several crystals are calculated. The calculated results are compared with the observed dechannelling rates of He+ ions in irradiated KBr crystals and those of He+ ions in irradiated Au crystals.
    Download PDF (1044K)
  • Hiroshi Kudo, Michihiko Mannami
    1976 Volume 40 Issue 6 Pages 1654-1658
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    As an application of the theory of dechannelling of fast ions in distorted crystal, the dechannelling of 1.5 MeV He+ ions in Al-6.8 at% Zn alloy crystals containing spherical precipitates was studied. The lattice displacement functions around the precipitates were determined from the analysis of the observed dechannelling of He+ ions in the crystals.
    Download PDF (560K)
  • Toshirou Yagi, Masaharu Tokunaga, Itaru Tatsuzaki
    1976 Volume 40 Issue 6 Pages 1659-1667
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientation of the longitudinal or quasi-longitudinal phonon vector q; (1) q⁄⁄c-axis, (2) q⁄⁄b-axis and (3) q deviates 5° from b-axis in the (100) plane. The temperature dependence of both the frequency shift and the spectral width shows a remarkable anisotropy near Tc. In the case (1) the temperature at which the width becomes maximum shifts to the lower temperature than Tc which has simultaneously been determined by an accompanied measurement of dielectric constant. The polarization relaxation time is determined from this temperature shift using the phenomenological relation. In the case (2) and the case (3), the decrease in the anomaly is explained as the depolarization field effect of the long range dipole-dipole interaction which is characteristic in the ferroelectric phase transition.
    Download PDF (1136K)
  • Tetsuo Moriya, Takashi Kushida
    1976 Volume 40 Issue 6 Pages 1668-1675
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Spontaneous emission spectra are calculated for typical radiative exciton-exciton collision processes at various temperatures. A suitably weighted δ-function of the inter-exciton separation is employed as the effective interaction potential, and numerical evaluations are performed with the band parameters of GaAs. The results describe well the band shape of the emission due to exciton-exciton collisions in GaAs which dominates the luminescence under intense nitrogen-laser excitation at low temperatures.
    Download PDF (1004K)
  • Tetsuo Moriya, Takashi Kushida
    1976 Volume 40 Issue 6 Pages 1676-1683
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Optical amplification gain spectra are calculated for typical radiative exciton-exciton collision processes by the use of the spontaneous emission spectra obtained in the preceding paper. The result well explains the experimental unsaturated gain spectra of GaAs. The stimulated emission spectra due to the two-exciton collision processes are shown, in good agreement with experiment, to shift towards lower energies with increasing the pumping intensity, excitation length and temperature.
    Download PDF (1108K)
  • Hiroyasu Shimizu, Yoshikazu Ohbayashi, Keiichi Yamamoto, Kenji Abe, Yo ...
    1976 Volume 40 Issue 6 Pages 1684-1689
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The far-infrared optical properties of CsCl at 300 and 80 K have been calculated by assuming the two-phonon summation- and difference-relaxations of k=0 TO mode. The frequency-dependent damping and frequency shift, due to cubic anharmonicity, have been calculated by using the eigenfrequencies and eigenvectors obtained from a simple shell model. Using the frequency shift and damping, the refractive index, the extinction coefficient and the reflectivity are calculated, and the results are compared with the experimental values obtained from the far-infrared reflection spectra. It is shown that the observed dip in the far-infrared reflection spectrum is due to the strong peak at 135 cm−1 in the damping spectrum (300 K).
    Download PDF (700K)
  • Yoshihiro Kamiya, Yasuo Nakai
    1976 Volume 40 Issue 6 Pages 1690-1697
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The contrast of electron microscopic images formed by inelastic scattering varies as the scattering angle of electrons which contribute to the image. At 50 kV, the electrons which are scattered inelastically by 2.8×10−2 rad. (3θB where θB is the Bragg angle for 220 reflection) do not give the dislocation image due to the loss of coherence, while the electrons scattered by 9.2×10−2 rad. (35 θB) still give the dislocation image at 800 kV. In the latter case contrast produced by electrons scattered through large angle is reverse to that of bright-field image. The contrast reversal and loss of coherence are discussed by the dynamical theory of electron diffraction for inelastic scattering. The contrast loss by multiple scattering in a thick crystal is briefly described.
    Download PDF (3032K)
  • Kazutaka Sato, Akira Sugiyama
    1976 Volume 40 Issue 6 Pages 1698-1702
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Motion of kinks on a dislocation is analysed on the basis of the string model for the dislocation. The equation of the motion is expressed in terms of the mass M per unit length of the dislocation, the line tension T, the Peierls force and an external stress, where viscous resistances are neglected. The equation is solved numerically under the initial condition that the dislocation can cross over the Peierls barrier in the direction of the force due to the external stress with the minimum energy. The solution shows, 1) the kinks propagate quasi-stationarily, 2) the propagation velocity approaches \sqrtTM nearly independently of the Peierls force and of the applied stress, 3) after long time the velocity component of dislocation segments in the direction normal to the dislocation line approaches the sound velocity, showing that the velocity-dependent mass should be taken into the string model.
    Download PDF (608K)
  • Takayoshi Suzuki, Hyongyu Kim
    1976 Volume 40 Issue 6 Pages 1703-1706
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The critical shear stress of NaCl single crystals has been measured down to 4.2 K. It is found that the critical resolved shear stress below 77 K increases rapidly with decreasing temperature, as observed for LiF. Analysis shows that the temperature and strain rate dependence of the critical resolved shear stress below 30 K is described in a consistent manner in terms of the theory of the thermally activated double kink formation mechanism of dislocation motion, i.e. the Peierls mechanism. The Peierls stress of NaCl is estimated to be 1.0–1.2 kg/mm2.
    Download PDF (516K)
  • Yoshiro Kainuma, Yasuji Kashiwase, Motokazu Kogiso
    1976 Volume 40 Issue 6 Pages 1707-1712
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A multi-beam dynamical theory of the thermal diffuse scattering of electrons by crystals in the harmonic lattice vibration is developed. The excitation of Bragg reflections of the incident beam is assumed. The intensity formulae of the first- and second-order thermal diffuse scatterings are expressed in terms of the averaged intensity matrix (M. Kogiso and Y. Kainuma: J. Phys. Soc. Japan 25 (1968) 498) and Born’s scattering matrix (M. Born: Proc. Roy. Soc. A180 (1942) 397). Several properties of the averaged intensity matrix are mentioned and its expressions in multi-beam cases are given.
    Download PDF (640K)
  • Yoshiro Kainuma, Yasuji Kashiwase, Motokazu Kogiso
    1976 Volume 40 Issue 6 Pages 1713-1719
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The intensity formula of the thermal diffuse scattering (TDS) of electrons developed by the present authors is applied to the scattering from aluminium crystals observed by Honjo, Kitamura and Kodera (J. Phys. Soc. Japan 19 (1964) 351). The numerical calculations give the intensity distribution of non-radial streaks observed. The second-order TDS is found to give rise to diffuse streaks with intensity distribution similar to those to the first-order TDS. The intensity of the second-order TDS is comparable in magnitude with that of the first-order TDS in the high scattering angle region at room temperature. The intensity ratio between the scatterings calculated on the basis of the dynamical and kinematical theories varies from 3 to 0.5 with the anomalous increase or decrease of the ratio in the small angle region.
    Download PDF (1112K)
  • Chikara Sugiura, Isao Suzuki, Jiro Kashiwakura, Yohichi Gohshi
    1976 Volume 40 Issue 6 Pages 1720-1724
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The sulfur Kβ emission spectra in fluorescence from FeS2, CoS2, NiS2 (with pyrite structure) and 2H–MoS2 (with layered structure) have been measured on a vacuum two-crystal spectrometer. Results are evaluated by comparing the sulfur Kβ emission spectra with the X-ray photoelectron spectra of the valence-band region for the transition-metal disulfides, with the sulfur LII, III emission spectra and with the recent electronic-structure calculations. A reasonable agreement is obtained between them. It is indicated that the sulfur 3p-like valence bands of the metal disulfides are very broad and their upper parts overlap with the 3d- or 4d-like band of the metals.
    Download PDF (660K)
  • Toshiro Komatsu, Hideo Suzuki
    1976 Volume 40 Issue 6 Pages 1725-1732
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Regarding unprotonated retinal Schiff-base as donor D and the phenol group of tyrosine as acceptor A, the charge-transfer model proposed by Akhtar et al. for visual pigments is examined according to our previous formulations and parametrization for π-electron systems. The ball-socket linkage model by Hooper and Buckser, which can be regarded as a kind of charge-transfer model, is also examined in the same way, regarding the charge distribution on the amino group as a positive point-charge. It is thus shown that these two models cannot explain the remarkable red-shift of λmax observed for the retinal in visual pigments.
    Download PDF (952K)
  • Toshio Sanematu, Yukio Mizuno
    1976 Volume 40 Issue 6 Pages 1733-1740
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    From bond-order arguments it is found that the length of the CN bond in the peptide residue increases appreciably upon the NV1 transition. This effect on the NV1 absorption band of α-helical polypeptides has been examined theoretically on the basis of the approximation proposed first by Briggs and Herzenberg. The exciton splitting is found to be enhanced markedly. In the second calculation the effect of the hypochromism also has been taken into account by assuming the simplest of possible mechanisms of the hypochromism. Agreement of the obtained absorption spectrum with experiment is excellent. All the necessary parameters have been evaluated semi-empirically.
    Download PDF (1088K)
  • Hiroshi Aikawa
    1976 Volume 40 Issue 6 Pages 1741-1749
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Anisotropy of electron temperature in a magnetized plasma is studied with the use of a cylindrical Langmuir probe, whose availability is investigated theoretically, and computer simulation is performed in comparison with the experimental results. It is found that the perpendicular electron temperature is possible to be measured by an ordinary cylindrical probe placed parallel to the magnetic field, while the parallel temperature by a plane probe placed perpendicular to the field. The theoretical treatments are based on the assumptions that the motion of electrons across the field is collision-dominated and the sheath width is much thinner than the probe radius. The experimental errors are found to be within 10% by estimating the various causes.
    Download PDF (1140K)
  • Altaf Hussain, Tsutomu Kuroda, Gen’ichi Horikoshi
    1976 Volume 40 Issue 6 Pages 1750-1756
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The drift velocity of particles in a plasma cylinder immersed in an axial magnetic field and a radial electric field was investigated using a test-wave technique, and plasma parameter measurements were made using a Langmuir probe. The drift velocity is determined directly by the test wave method, and at the same time, calculated from the information concerning the electric and magnetic fields, taking into account the effects of a cylindrical geometry and a finite Larmor radius. From the discrepancy between these two drift velocities, the collision term for a cylindrical geometry can be determined as a function of B. Finally, after making some corrections in Er, the value of the cross section for collision between ions and neutrals is obtained, which is smaller than the current values in the literature. After some discussion, it is found that a simple estimation of the slowing-down cross section is in good agreement with the experiment.
    Download PDF (876K)
  • Kimitaka Itoh, Sanae Inoue, Shoichi Yoshikawa
    1976 Volume 40 Issue 6 Pages 1757-1761
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A new model of the disruptive instability is presented. Nonlinear MHD instability of m=n=0 mode is solved in a cylindrical tokamak configuration. The stability threshold of this mode is obtained in terms of the amplitude of the co-existing higher m mode instabilities. Below the threshold, this mode has finite amplitude, and above the threshold, it grows catastrophically. The experimental characteristics of the disruptive instability well conform to the properties of the m=n=0 nonlinear MHD instability.
    Download PDF (492K)
  • Sanae Inoue, Kimitaka Itoh, Shoichi Yoshikawa
    1976 Volume 40 Issue 6 Pages 1762-1768
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Helical equilibria of tokamak are investigated with the self-consistent equilibrium equation. These are divided into three cases; 1) The shell is circular without an error field, 2) circular shell with external helical field such as helical windings field, and 3) the shell is helically deformed. In the first case, helical equilibrium is found for a particular q value. In the second case, an equilibrium is found for any q value, and there appears the resonance of the plasma with the external field. The plasma deformation is found to be very large for the imposition of a slight helical field. And for the last case, the analysis gives the similar result as the second case.
    These resonant phenomena cannot be derived from the mere superposition of the fields.
    Download PDF (768K)
  • Takashi Ikuta, Tosiya Taniuti
    1976 Volume 40 Issue 6 Pages 1769-1777
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The present paper deals with weakly dispersive hydromagnetic waves of small but finite amplitude propagating slowly (or standing) in a uniform collisionless plasma-flow, which is aligned with an applied magnetic field and the velocity of which is in the specific range so that the system of equations for the steady aligned flow in the ideal magnetohydrodynamics becomes hyperbolic. The two fluid model of the collisionless plasma is used, and by means of the reductive perturbation method, the system is reduced to the Korteweg-de Vries equation expressed in terms of three independent variables which are responsible for slow two-dimensional spatial variation and slower temporal change. Solitons are obtained even without the time dependence, characteristic properties of which are investigated. Boundary conditions to produce the solitons are also examined.
    Download PDF (1088K)
  • Masayoshi Yamada, Kenji Wasa, Chihiro Hamaguchi
    1976 Volume 40 Issue 6 Pages 1778
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (120K)
  • Shigeaki Suwa, Ken-ichi Kusukawa
    1976 Volume 40 Issue 6 Pages 1779A
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (24K)
  • Hideaki Chihara, Nobuo Nakamura
    1976 Volume 40 Issue 6 Pages 1779B
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (20K)
  • Kazuyoshi Takeda
    1976 Volume 40 Issue 6 Pages 1781-1782
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The drastic reduction of the Nèel temperature TN has been observed by the measurement of heat capacity and magnetic susceptibility in a quasi-one-dimensional Ising spin system (CH3)3NHCoCl3·2H2O(TN=4.1 K) with small amount of impurity Mn2+ ions. The reduction is quite steep; TN(x)≤0.70 TN(0) at x=6 (x: atomic % of Mn2+ ions). For x>6, the reduction becomes rather gradual.
    Download PDF (244K)
  • Hisao Okamoto, Katsuhiko Nagano
    1976 Volume 40 Issue 6 Pages 1783-1784
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The sound attenuation constant is calculated for the two-dimensional ferro- and antiferro-magnets. Its frequency and angular dependence turn out to be ωk2ln(1⁄ωk) and cos4θ, respectively. The effect of the uniaxial anisotropy is also taken into account in a self-consistent way.
    Download PDF (196K)
  • Kenji Miyakawa, Shin Akahoshi, Akira Takase
    1976 Volume 40 Issue 6 Pages 1785-1786
    Published: June 15, 1976
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Spatial fluctuations of Williams domain mode in nematic Liquid crystals are studied by observing the far-field diffraction pattern. The results are well explained by Graham’s theory.
    Download PDF (204K)
  • Yoshio Kamishina, Ikunori Takada, Teinosuke Kanda
    1976 Volume 40 Issue 6 Pages 1787-1788
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Electron spin resonance of a single crystal of Cu[Hg(SCN)4] was studied from liquid helium temperature to room temperature. Microwaves of 9 and 35 GHz were used. A unit cell contains two kinds of Cu++ ions with different principal axes of g-tensors. From the frequency dependence of the line splitting, the magnitude of the exchange interaction between dissimilar ions was found to depend strongly on temperature: 2J\simeq0.07 K at room temperature and \simeq0.15 K at liquid nitrogen temperature. All lines are strongly narrowed by the stronger exchange interaction between similar ions, which is about one order of magnitude larger than the above.
    Download PDF (296K)
  • Naoko Kasai, Shinji Ogawa
    1976 Volume 40 Issue 6 Pages 1789-1790
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The thermal expansion of NiS2, Ni0.9Co0.1S2, Ni0.9Cu0.1S2 and Ni0.95Cu0.05S2 has been measured from 4.2 K to room temperature. The anomalies, which correspond to antiferromagnetic ordering and to appearance of weak ferromagnetism, have been observed in all specimens. The lattice, electronic and magnetic Grüneisen constans are determined. The magnetic Grüneisen constant changes its sign from negative to positive corresponding to the metal-semiconductor transition which occurs between Ni0.9Co0.1S2 and Ni0.93Co0.07S2.
    Download PDF (248K)
  • Tadashi Itoh, Yasuo Nozue, Masayasu Ueta
    1976 Volume 40 Issue 6 Pages 1791-1792
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Giant two-photon absorption for the direct generation of excitonic molecule is found at 2.5507 eV in CdS. Two-photon resonance Raman scattering is found which has an excitonic molecule and a transverse exciton as the intermediate and final states, respectively.
    Download PDF (244K)
  • Jiro Sakami
    1976 Volume 40 Issue 6 Pages 1793-1794
    Published: June 15, 1976
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Utilizing the “piezoelectric line” effect, thickness-shear vibrations were excited during the time of a gate pulse width in an a-plate of Rochelle salt crystal. The free vibrations caused by the excitations were studied on a cathode-ray oscilloscope. Attenuation constants β55 and β66 were obtained from the slope of straight lines of semi-log plots of the attenuation curves of transverse waves propagating along the a-axis. The temperature dependence of the two constants in the temperature range from −50° to 40°C was studied.
    Download PDF (256K)
feedback
Top