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Volume 36, Issue 1
Displaying 1-50 of 59 articles from this issue
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Masaaki Kobayashi, Shigenori Hiramatsu, Kunitaka Kondo, Shin-ichi Kuro ...1974 Volume 36 Issue 1 Pages 1-9
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe linear polarization of coherent bremsstrahlung was measured at 270∼950 Mev by comparing one-dimensionally projected angular distribution of converted symmetric-pair electrons with the theory. The measurement of a certain point was calibrated to the reference point during each short period, significantly reducing the fluctuation in the measurement. The obtained polarization was in excellent agreement with the theory within the assigned error of ±0.02∼0.05. The polarization for the case of null injection angle of the incident electron beam to the crystal axis [110] was also measured at 350 and 950 MeV. The obtained polarizations were zero in agreement with the theory.View full abstractDownload PDF (760K) -
Takao Nakashima1974 Volume 36 Issue 1 Pages 10-17
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSResonances in the 39K(p, α0)36Ar reaction were investigated. In the energy region Ep=3.05–4.20 MeV, 102 resonances were observed. Resonance energies, strengths and widths are reported. The angular distributions were measured at 37 resonance energies, and the analysis by the one-level formula allowed unique assignment of the spins for 17 cases. In 18 cases, two or more different spin assignments were possible. An experimental level density of 40Ca was estimated to be ρexp=131 MeV−1 at the excitation energy Ex=11.87 MeV. By the smoothing procedure of the excitation function, a broad resonance with the width of about 400 keV was obtained at Ep=3.45 MeV. An average alpha-particle reduced width in this reaction was estimated to be about 0.02×h2⁄MR2.View full abstractDownload PDF (964K) -
Kumataro Ukai, Ichita Endo, Katsuhide Yoshida, Masamichi Hongoh, Ken K ...1974 Volume 36 Issue 1 Pages 18-26
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe differential cross section and recoil proton polarization for the process γ+p→η°+p were measured by detecting photons from η-decay and recoil protons.
The differential cross sections are 0.75±0.03 and 1.04±0.07 μb/sr at the CM angles θη*=82.3° and 108.3°, respectively, at the incident photon energy k=890 MeV, and 0.20±0.05 μb/sr at θη*=83.1° and k=1050 MeV. Thus the differential cross sections at k=890 MeV seem to show a backward peaking. The value of recoil proton polarization is −0.15±0.30 at θη*=82.3°, whereas it is 0.27±0.25 at θη*=108.3°, both at k=890 MeV, thus suggesting a sign change around θη*=90°. In addition to the S11 (1535), a comparably large contribution of the D13 (1520) is needed to explain the experimental results.View full abstractDownload PDF (1188K) -
Mitsuhiro Kawamura, Tsuyoshi Tomiyama1974 Volume 36 Issue 1 Pages 27-31
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe perturbed angular correlations of 675 keV–412 keV gamma-gamma cascade in Hg198 were measured on the iron metal samples containing 0.2∼2 at % gold impurity magnetized up to saturation.
The average value of the shifts of angular correlation pattern was obtained as |ωτ|=(0.049±0.009) radian.
The hyperfine magnetic field at mercury in iron was found to be −(590±160) kOe, assuming the known value of mean life and g-factor of 412 keV level in Hg198. The multipole mixing of 675 keV transition was also obtained to be (60.6±2.5)% E 2 plus (39.4\mp2.5)% M 1.View full abstractDownload PDF (548K) -
Kenn Kubo1974 Volume 36 Issue 1 Pages 32-38
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectronic structure in magnetic semiconductors is investigated on the basis of the s-d exchange model. The exchange scattering of an electron by localized spins is treated in the coherent potential approximation. Coupled equations for the down- and up- spin Green functions are obtained. These equations agree in the weak s-d interaction limit with the results of the molecular field approximation and in the strong interaction limit with those obtained previously by the present author. The density of states for down- and up- spins is calculated in the paramagnetic and completely ferromagnetic states for various values of interaction strength, by assuming a semi-elliptic form for unperturbed density of states.View full abstractDownload PDF (760K) -
Yutaka Kano1974 Volume 36 Issue 1 Pages 39-47
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relation between the Wigner distribution function and the P-representation of the density matrix for describing a boson system is investigated. The coherent-state representation of the density matrix is introduced for a Bose particle system. Especially the P-representation of the density matrix describing an ideal boson system in thermal equilibrium is obtained. It can be seen that the distribution function of the complex eigenvalues of the destruction operator is non-negative in this particular case. The coherent-state representation of the Wigner function is then obtained. The coherent-state representation of the components in the decomposition of the Wigner function is also found. The London-Placzek formula can be derived by using one of these components.View full abstractDownload PDF (760K) -
Takashi Iwashita, Norikiyo Uryû1974 Volume 36 Issue 1 Pages 48-54
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFrom the analyses of the magnetic susceptibility and/or the magnetic heat capacity of the polynuclear complex compounds of iron group ions, it has been suggested that there exists an additional higher order spin coupling besides the usual Heisenberg exchange interaction. It is shown that the higher order spin coupling can be derived from the minimum condition of the free energy of the cluster system. For that purpose, a magnetoelastic term is introduced in the free energy and a dependence of the exchange coupling on the distance between interacting ions is assumed. In an alternative way, it is also shown that the higher order spin coupling can be derived from the perturbation procedure in which the spin-orbit interaction and the usual exchange interaction are taken as the perturbation. A quantitative comparison of the present theory with the values obtained from data analyses makes it clear that the magnetostriction is an important origin for the appearance of the higher order spin coupling.View full abstractDownload PDF (924K) -
Keiichiro Nasu, Akihiko Tamura, Kazuko Kojima, Tadanobu Kojima1974 Volume 36 Issue 1 Pages 55-61
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEmission spectra of Eu2+-doped KCl, KBr and NaCl arising from the transition 5d(4f)6→(4f)7 have been measured at LHeT. Besides the previously known structure due to resonance modes, another vibronic structure has been found in KCl and NaCl. The structure has been analysed by the projected Green’s function method, and attributed to van Hove singularities of the state density of the band mode phonons which couple to the electronic transition through the displacement of the equilibrium positions of the nearest or the next nearest neighbor unperturbed ions.View full abstractDownload PDF (736K) -
Ken’ichi Okamoto1974 Volume 36 Issue 1 Pages 62-68
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGround-state energy of piezoelectric polaron is theoretically discussed for the wide range of coupling constant α. Feynman’s path-integral variational method is mainly used to calculate ground-state energy and is compared with those of other theories.View full abstractDownload PDF (696K) -
Haruo Moriguchi1974 Volume 36 Issue 1 Pages 69-77
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relativistic theory of heat and temperature is investigated on the stand point of elementary case study and by means of the exact equation of motion of continuous body.
It is shown that a kind of heat conduction between two bodies in relative motion is theoretically possible and the conduction temperature must be a relativistic invariant.
The considerations on the thermodynamical variables in the presence of heat current also lead to the scalar thermodynamics, where the invariance of the thermodynamical temperature is shown in the same meaning as the invariance of the nonrelativistic temperature.View full abstractDownload PDF (1128K) -
Kazukiyo Nagata, Yuzo Tomono1974 Volume 36 Issue 1 Pages 78-83
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature variation of the far-infrared AFMR frequency in the quadratic layer antiferromagnets K2NiF4 and Rb2NiF4 has been measured using Fourier transform interferometry techniques. The results are found to be sharply different from those in usual three-dimensional antiferromagnets. Oguchi-Honma’s spin wave theory applied to the two-dimensional systems is shown to predict properly the observed behaviours.View full abstractDownload PDF (796K) -
Toshiro Akino1974 Volume 36 Issue 1 Pages 84-92
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ground-state spin configuration of the normal cubic spinel ZnFe2O4 is studied on the basis of Heisenberg model with five different superexchange interactions. It is shown that three types of degenerate antiferromagnetic configurations with wavevector Q=(2π⁄a, 0, π⁄a) are the ground spin state on a straight line in the two-dimensional exchange-parameter space at fixed values of the other two parameters. Magnetic dipole-dipole interaction stabilizes four particular noncollinear antiferromagnetic configurations and gives a width to the line of stability. These four configurations give the same neutron diffraction line intensities which are in fairly good agreement with the observed intensities due to König et al.View full abstractDownload PDF (968K) -
Kazuko Ebara, Yukito Tanabe1974 Volume 36 Issue 1 Pages 93-102
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the intensity, frequency and line width of a magnon sideband is calculated for a linear chain antiferromagnet by means of classical approximation for spins, and comparison is made with the observed results on N(CH3)4MnCl3(TMMC) and CsMnCl3·2H2O(CMC). At low temperatures, the classical approximation gives results corresponding to the Néel state for the antiferromagnetic ground state, so that certain discrepancy exists between the present results and that of the simple spin wave theory. At high temperatures, the results should be more reliable. In order to see the validity of the classical approximation, the internal energy of the system is also calculated by means of a series expansion with respect to 1/S. The variation of the internal energy as a function of temperature according to this method is compared with the results of various other approximations and also with the exact numerical results.View full abstractDownload PDF (988K) -
Akio Kotani1974 Volume 36 Issue 1 Pages 103-111
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFree energies of sinusoidal and antiferromagnetic spin density waves (SDW) are calculated with the model of energy bands proposed in a previous paper. The calculation for the sinusoidal SDW is made by an interpolation method. It is shown that the commensurate-incommensurate transition (denoted by C–I transition) in Cr–Mn alloys arises from the cooperation of the effect of entropy and the effect of a flow of electrons between the octahedral Fermi surfaces of electron and hole bands and the other free Fermi surfaces. The C–I transition in a helical SDW is also studied. Finally the origin of the C–I transition in Cr–Fe alloys is qualitatively discussed.View full abstractDownload PDF (1144K) -
Masahumi Kohgi, Yoshikazu Ishikawa, Isao Harada, Kazuko Motizuki1974 Volume 36 Issue 1 Pages 112-122
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin waves in MnO have been studied at various temperatures from 4.2 K to the Néel temperature TN of 117 K by means of neutron inelastic scattering techniques. The dispersion curves in the [001], [111] and [\bar1\bar11] direction have been determined. Using the spin Hamiltonian with distance dependent n.n. interaction, n.n.n. interaction and dipole-dipole interaction, the spin wave theory involving magnon-magnon interaction has been developed. It has been found that the theory interprets not only the spin wave dispersion curves at 4.2 K but also its temperature dependence up to T⁄TN=0.9. The magnon density of states has been calculated.View full abstractDownload PDF (1148K) -
Tadao Iwata, Takeshi Nihira, Hideto Matsuo1974 Volume 36 Issue 1 Pages 123-129
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSChanges in the c-axis electrical resistivity of pyrolytic graphite due to electron irradiations at 80 K and due to subsequent isochronal pulse annealings up to 400 K wave measured. The average carrier mobility in the c-axis direction was calculated from the c-axis resistivity by the use of the carrier density obtained through the a-axis galvanomagnetic property measurements. The c-axis resistivity decreased by irradiation at 80 K. The reciprocal of the average carrier mobility in the c-axis direction increased by 7±2 mV·sec·cm−2 per ppm of Frenkel defects. As to thermal annealings, the c-axis electrical resistivity showed peculiar features compared with the a-axis one. The reciprocal of the average carrier mobility in the c-axis direction, however, showed nearly the same changes in relative values as that in the a-axis direction with annealing temperatures.View full abstractDownload PDF (956K) -
Kiyoyuki Terakura, Naoki Yokoyama, Shotaro Kohzuki, Kunisuke Asayama1974 Volume 36 Issue 1 Pages 130-134
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nuclear spin-lattice relaxation time, T1, and the Knight shift of Sc45 disolved dilutely in Pd and Pt are measured in the temperature region of 1.4∼4.2 K. T1’s of Sc45 in Pd and Pt are about 10 to 20 times larger than that of pure Sc45 metal. These data are compared with those of V51 reported previously. Ab initio calculations of the relaxation rates of Sc45 and V51 in Pd are carried out. In the case of Sc45 in Pd, the resonance d states lie fairly above the d band and the Fermi level of Pd and the contribution from d electrons to the relaxation rate can be neglected, whereas in pure Sc45, this contribution is large. In the case of V51 in Pd, the resonance peaks of d stated in the local density of states at the V51 site lie just above the d band and the Fermi level of Pd. The d electrons make comparable contributions to the relaxation rate with s electrons.View full abstractDownload PDF (488K) -
Takashi Akahane, Osamu Sueoka, Hiroshi Morinaga, Kunio Fujiwara1974 Volume 36 Issue 1 Pages 135-141
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRotating-specimen measurements of the annihilation radiation have been carried out to investigate the Fermi surface of α Cu–Al alloys up to 15.5 at % Al. The conventional angular-correlation measurements along the [100] axis have also been performed in a long-slit geometry.
The Fermi surface of α Cu–Al alloys has been found to be similar in shape to that of Cu. A trend of the monotonical increase with Al concentration has been found both in the size of ⟨111⟩ neck and in the ⟨100⟩ Fermi momentum. The change in the Fermi surface of this alloy follows closely that of α-brass with the same e⁄a.View full abstractDownload PDF (796K) -
Yozo Kawasaki1974 Volume 36 Issue 1 Pages 142-148
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCopper single crystals with the [145] and the [112] axes were deformed in tension at room temperature and dislocation structures were observed by transmission electron microscopy. In the later stage of deformation, layered cell (carpet) structures were formed nearly parallel to the active slip planes. Close examination showed, however, that cell boundaries inclined from the slip plane by several degrees around a ⟨112⟩ axis on the slip plane. The cell boundary densities were approximately proportional to tensile stress and the proportional constants in both crystals were nearly the same. The observed results were consistent with the fundamental assumptions in Takeuchi’s theory of work hardening.View full abstractDownload PDF (2616K) -
Nobuhiko Sawaki, Akira Yoshida, Tetsuya Arizumi1974 Volume 36 Issue 1 Pages 149-153
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAnalyzing I–V characteristics of the direct current component of a reversely biased germanium tunnel diode, the density of states and the electronic self-energy in the impurity band associated with (000) subsidiary valley were investigated. The d2I⁄dV2−V curves for As doped samples (Nd=5×1018 and 1.5×1019 cm−3) showed that the density of states has a dip between the impurity band and the main band. In the case of Sb doped sample (Nd=5×1018 and 1.3×1019 cm−3), there was little evidence for the dip, but there existed only a long tail going down continuously below the main band. The imaginary part of the self-energy in the impurity band was found to decay exponentially into the forbidden band in both materials. The results were in good agreement with the measurements of the localized spin through the zero bias conductance anomaly.View full abstractDownload PDF (620K) -
K. D. Misra, M. N. Sharma1974 Volume 36 Issue 1 Pages 154-157
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe conductivity and dielectric loss measurements have been made for rubidium chloride crystal doped with divalent lead. Energy of formation of Schottky defects Ws energy of migration for cation vacancy Ec and free energy of association of impurity-vacancy pair have been calculated from conductivity measurements. The frequency factor f0 and the activation energy needed to a bound vacancy for jumping to one of its equivalent site are determined from dielectric loss measurements. A comparison of these values with the corresponding data available for other NaCl type crystals is also made and validity of the Dreyfus theory has been discussed.View full abstractDownload PDF (412K) -
Takao Nanba, Noriyuki Miura, Nobukata Nagasawa1974 Volume 36 Issue 1 Pages 158-160
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe optical absorption spectra of Ar this films containing Xe with less than 0.042 molar fraction are studied by using synchrotron orbital radiation from a 1.3 GeV electron synchrotron at INS-Tokyo as a light source. Measurements are made at 10 K in the energy range from 8.5 eV to 11.5 eV. The intensity variation of a band, which appears at about 9.03 eV in a sample containing 0.007 molar fraction of Xe, is investigated as the function of Xe concentration. The analysis reveals that the band is originated from the dimer of Xe atoms in solid Ar.View full abstractDownload PDF (268K) -
Ryosuke Shimizu, Takao Koda, Toshiaki Murahashi1974 Volume 36 Issue 1 Pages 161-168
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLuminescence and its excitation spectra are investigated on TlBr and TlCl single crystals. The luminescence spectra of both halides consist of three characteristic emissions, a broad emission band and two kinds of narrow emission lines. The highest energy emission line is ascribed to the resonance emission of the direct exciton. The low energy threshold of the excitation spectra is interpreted as the contribution from the indirect interband transition, In TlBr, an oscillatory phonon structure is observed above this threshold, from which the indirect-exciton energy is estimated to be 2.630±0.005 eV. A similar edge in TlCl is supposed to lie around 3.20 eV. The sharp emission lines appearing below this indirect edge are attributable to the radiative recombination of the indirect exciton bound to some impurities. Discussions are presented on the radiative decay of these direct and indirect excitons in thallous halides.View full abstractDownload PDF (1112K) -
Yoji Kato, Takenari Goto, Toshihiro Fujii, Masayasu Ueta1974 Volume 36 Issue 1 Pages 169-176
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the strong laser irradiation on the exciton bands of CuCl has been studied. The Z3 and Z1,2 exciton bands are found to shift to high energy side linearly with the laser intensity. The fact is explained in terms of Hanamura’s theory which describes the increase of the exciton formation energy due to the interaction between excitons. The ratio of the peak shift of the Z1,2 band to that of the Z3 band is 0.89. From the ratio and the reduced mass of the Z3 exciton, the effective masses of the electron and hold are deduced to be 0.44m0 and 3.6m0, respectively.View full abstractDownload PDF (1028K) -
R. K. Pandey1974 Volume 36 Issue 1 Pages 177-178
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMethods for growing single crystal of Li2Gd4(MoO4)7 and a few of its physical properties have been reported here. This material is a new addition to the group of ferroelectric and paramagnetic materials. The value of its magnetic susceptibility at room temperature is 59.55×10−6 cm3/g and the characteristic ferroelectric domains are observed along the c-axis.View full abstractDownload PDF (308K) -
Yoshiro Sasaki, Chihiro Hamaguchi, Akihiro Moritani, Junkichi Nakai1974 Volume 36 Issue 1 Pages 179-186
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electric field effect on the dielectric function in highly anisotropic crystals is calculated within the weak field approximation at a minimum threshold and with the tight binding approximation for the energy band structure along the anisotropic axis (z). It has been found that the line shape of Δε2(ω, F) can be defined by the ratio of the band width of the interband energy along the anisotropic axis to the characteristic electro-optic energy hΩ for the field direction at the band extrema. When the ratio is much smaller than unity the line shape shows two dimensional character. When the ratio is much greater than unity the line shape represents three dimensional character. The line shapes of Δε2(ω, F) for F⊥z and F⁄⁄z are numerically calculated for several values of the ratio. The present results can be applied to analyze the electroreflectance spectra in layer semiconductors such as GaTe, GaSe and GaS.View full abstractDownload PDF (904K) -
Shunya Ishioka1974 Volume 36 Issue 1 Pages 187-195
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe peierls stress of a screw dislocation in a simplified crystal model is given exactly. The stress oscillates strongly as the dislocation width increases.View full abstractDownload PDF (1028K) -
Ryohei Nakata, Katsuyasu Kohno, Minoru Sumita, Eiichi Higuchi1974 Volume 36 Issue 1 Pages 196-201
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectron spin resonance studies have been carried out on x-irradiated CaF2 single crystals. A new ESR center is induced with x-irradiation at room temperature. This new ESR center exhibits well resolved super hyperfine structures. The ESR spectrum is analysed with a spin Hamiltonian
(Remark: Graphics omitted.) with S=1⁄2 and Ii=1/2.
The obtained spin Hamiltonian parameters are g=2.0007, |as|=10.6 and |ap|=1.8 gauss. The ESR center grows larger with x-irradiation time and its growth is saturated after irradiation of about 4 to 5 hours. The thermal decays of the ESR center are well approximated with the first order kinetics, and its activation energy is determined as E=0.47±0.05 eV. The optical bleachings of the ESR center were also made in the range from 398 to 658 nm, and ESR signals were reduced most prominently at 580 nm.View full abstractDownload PDF (648K) -
Isao Yoshizawa, Hiroshi Naramoto, Koji Kamada1974 Volume 36 Issue 1 Pages 202-206
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe irradiation induced hardening and change in thermal activation volume of plastic deformation in Cu single crystals were measured after electron irradiation in the dose range of 1×1016∼8×1017 electrons/cm2 at 1.8 MeV.
Different dependences on the electron does were found in the lower and the higher dose ranges with boundary of about 1×1017 electrons/cm2 between them in both hardening and activation volume. Thermodynamical analysis of the result showed that intrinsic interaction energy between dislocation and obstacle, which is expected to be independent on the length of dislocation segment, decreases sharply from about 3 eV as the dose increases in the lower dose range, and tends to saturate to the value less than 0.3 eV in the higher dose range.View full abstractDownload PDF (684K) -
Mikio Kobayakawa, Hiroaki Niwa, Seita Tanemura1974 Volume 36 Issue 1 Pages 207-213
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to study the proton channeling process in the single crystals of CaF2 and BaF2, the half-angles and minimum yields for axes and planes were measured by means of Rutherford backscattering in the energy range 0.60–1.20 MeV and of gamma rays from the 873 keV resonance in the 19F(p, αγ)16O reaction. The parameter dependence of the half-angles observed for the axes (⟨111⟩, ⟨110⟩, and ⟨100⟩) is dependent on the target crystals, and that for the planes ({110} and {112}) depends on the Miller index of planes. if the effects of thermal vibration and planar spacing are taken into account on the basis of Barrett’s calculations, the parameter dependence and magnitudes of the measured half-angles show reasonable agreement with the calculations. The minimum yields for the mixed and monatomic rows along the axes agree reasonably with the predicted values; however, the minimum yields for the planes are considerably larger than those predicted.View full abstractDownload PDF (888K) -
Hiroshi Kudo, Takashi Oshiyama, Michi-hiko Mannami1974 Volume 36 Issue 1 Pages 214-220
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSChannelling of fast protons in silicon and germanium crystals with surface damaged layer was studied by backscattering method. The energy spectra of the backscattered protons can be interpreted by a theory based on the particle diffusion in the transverse momentum space. It is also demonstrated that the theory is applicable to the determination of the depth distribution profiles of the lattice defects in imperfect crystals.View full abstractDownload PDF (756K) -
Takeo Ichinokawa, Matsuomi Nishimura, Hirotsugu Wada1974 Volume 36 Issue 1 Pages 221-226
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe contrast reversals of pseudo-Kikuchi band and lines due to the detector position are observed for Si by using the surface scanning electron microscope. The detector is placed at two positions, i.e. high and low angle positions for the crystal surface. In the high angle detection, the pseudo-Kikuchi band changes its contrast from excess to defect with decreasing the glancing angle and moreover the contrast of Kikuchi lines is also reversed between a pair of lines and along a line in the region of the low glancing angle. These situations are not observed in the low angle detection. These facts are explained qualitatively by applying the reciprocity theorem in electron diffraction and the dynamical theory of two-beam approximation with considering the anomalous absorption and the angular distribution of inelastic scattering electrons in crystal.View full abstractDownload PDF (1092K) -
Yoshihiro Hamauzu1974 Volume 36 Issue 1 Pages 227-233
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA method of calculating the intensities of the diffracted waves in low-energy electron diffraction (LEED) by crystal surfaces is proposed. The method is based on the Born series for the diffraction amplitude in the momentum representation. The diffraction amplitude is calculated by an iteration scheme starting from the zeroth-order solution taking into account the forward-scattering exactly, which is dominant among the LEED processes.
Also Kambe’s ans Beeby’s theories in the angular momentum representation are derived by using the Lloyd pseudopotential used in his band theory and this derivation reveals a close relationship among Kambe’s Beeby’s and the present theories.View full abstractDownload PDF (720K) -
Noboru Matsudaira, Sumiaki Nagai1974 Volume 36 Issue 1 Pages 234-238
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe scattering cross section of X-rays inelastically scattered by an electron gas is calculated in the random phase approximation, for various scattering angles, making use of the formula previously derived by Ohmura and Matsudaira. When the angle is small, the profile deviates from the inverse parabolla due to the pauli exclusion principle and to the electron-electron interaction. Especially when the angle is near θc, corresponding to the plasma cut-off wave number, a pronounced peak appears, reflecting plasmon emission. It is also shown that if a scattering angle is a little larger than θc, yet the “plasmon peak” survives. These features are in excellent agreement with the experiments of Suzuki and Tanokura, and Alexandropoulos.View full abstractDownload PDF (412K) -
Tomohei Sasada1974 Volume 36 Issue 1 Pages 239-244
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe dynamics of a dissipative coupled system consisting of N two-level atoms and their resonant photon mode, each of which is coupled to its reservoir, is studied for the case of only one atomic excitation involved. A similarity between an elementary excitation in the system and a polariton in a dielectric crystal is pointed out. A relationship between the photon emission to be observed and the resonance trapping of photon is clarified. The time behavior of radiation intensity has either a damped oscillatory or an overdamped feature, depending on the strength that the photon emitted from the excited atom reacts on the atomic system.View full abstractDownload PDF (624K) -
Yasuo Oka, Takashi Kushida, Toshiaki Murahashi, Takao Koda1974 Volume 36 Issue 1 Pages 245-253
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSResonant behavior of Raman cross-section is studied in CuCl, CuBr and CuI by using an argon ion laser and a tunable dye laser as the excitation light source. The results are in good agreement with existing theory demonstrating the significance of the discrete and continuum levels of excitons as the intermediate state of the transition. It is concluded that the 1LO scattering cross-section near the resonance region is governed by the n=1 exciton level, while the exciton continuum contributes predominantly in the off resonance region. contrary to the cases of CuBr and CuI, higher exciton series (Z12) also plays an important role in CuCl, which fact is ascribed to the characteristic band structure of this material. As in CdS and ZnO previously reported, the observed frequency dependence of the 2LO Raman intensity in CuCl is consistently interpreted in terms of the consecutive scattering of virtually created excitons by two phonons.View full abstractDownload PDF (1144K) -
Yukikazu Itikawa1974 Volume 36 Issue 1 Pages 254-258
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy using the close-coupling method, differential cross sections are calculated for the elastic scattering and the rotational excitation (0→1) in the He–HD collision. The calculation is carried out for relative kinetic energies of 0.014, 0.02, and 0.04 eV. The cross section for the rotational excitation shows a gradual peaking in the backward direction. This and other qualitative features of the angular dependence of the cross sections are discussed in terms of the interaction potential used.View full abstractDownload PDF (432K) -
Nobuo Kobayashi1974 Volume 36 Issue 1 Pages 259-266
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMolecular asymmetric charge transfer reactions in the systems Ar+–No, Kr+–NO, Ar+–O2, Kr+–O2 and Ar+–CO were studied by an injected-ion drift tube technique in the energy range from 0.04 eV to 3 eV. All reactions have large cross sections in spite of the large exothermicities, and each of them has a minimum. The cross sections in the low energy part have E−1⁄2 dependence when the reactant is NO, while they have E−1 dependences when the reactant is O2 or CO. An hypothesis is proposed to explain the large cross sections, but without quantitative treatment.View full abstractDownload PDF (1196K) -
Kazuhiro Nozaki, Tosiya Taniuti1974 Volume 36 Issue 1 Pages 267-270
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the drift wave of small but finite amplitude propagating in a plasma of hot electrons and cold ions is governed by a modified Kortweg-de Vries equation in two-dimensional space comprising the external magnetic field and the direction normal to a density gradient. The solitary wave is obtained explicitly.View full abstractDownload PDF (420K) -
Akira Yoshizawa1974 Volume 36 Issue 1 Pages 271-275
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe author has previously shown that the skin friction Cf on an impulsively started semi-infinite flat plate is asymptotically given by Cf=s−1Cf(0)+Cf(1)+O(s) as s→0, where s=(U2t⁄ν)1⁄2, t is the time, U the uniform velocity of the plate and ν the kinematic viscosity. In the present paper, the values of Cf(0) and Cf(1) are determined by numerical integration of the basic equations as formulated by the author. The results obtained show that the transition to the final steady state is realized rapidly in the close neighborhood of the leading edge of the plate.View full abstractDownload PDF (464K) -
Akira Yoshizawa1974 Volume 36 Issue 1 Pages 276-281
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUnsteady viscous flow due to the impulsive motion of a semi-infinite flat plate is studied by solving the Navier-Stokes equations on the basis of the method of matched asymptotic expansions. Higher-order corrections to the Rayleigh solution downstream in the final period are obtained in the form of an inverse power series of a Reynolds number defined as a function of time. Matching the present solution from downstream and the solution from upstream leads to the determination of unknown constants in both solutions.View full abstractDownload PDF (476K) -
Goichi Matsui, Shigeki Morioka1974 Volume 36 Issue 1 Pages 282-287
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe disturbance propagating thorough a single gas plug bounded by liquid on both sides in a pipe is considered on the basis of the linearized theory in ordinary gasdynamics. The temporal and spatial features of the propagation in such a two-phase system are discussed analytically and numerically. It is explicitly shown that there are two characteristic times of the propagation and that the transmission through a plug is promoted with the strength of a disturbance. A similar discussion can be applied to a liquid plug bounded by gas on both sides.View full abstractDownload PDF (696K) -
Sharad C. Purohit1974 Volume 36 Issue 1 Pages 288-292
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSelf-similar homothermal flows of self-gravitating gas behind the spherical shock wave propagating in a nonuniform atmosphere at rest are investigated. Using a similarity variable the solution corresponding to infinite star (ρ1∝r−w) has been constructed. Both numerical and particular analytical solutions are obtained. These solutions are compared with the corresponding solutions of the adiabatic flow.View full abstractDownload PDF (464K) -
Syozo Kubo1974 Volume 36 Issue 1 Pages 293-297
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThis paper deals theoretically with the stagnation point flow of a radiating gas when the global optical thickness is large. The radiative heat transfer is assumed to be of the same order of magnitude as the convective one and the Mach number is assumed to be small. A method of solution is used in which the isentropic outer flow, the diffusive (Rosseland type) layer flow and the radiation layer flow are considered successively. Actual analysis has been carried out to the second approximation correct to the order of the inverse square root of the Bouguer number. Effects due to the radiation slip are studied in detail. Numerical results are also obtained for the distributions of the flow velocity and the temperature in the diffusive layer and the radiation layer. They are compared with those of a radiative boundary layer flow on a flat plate.View full abstractDownload PDF (616K) -
Sadatoshi Taneda1974 Volume 36 Issue 1 Pages 298-303
Published: January 15, 1974
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown experimentally that a necklace vortex is formed around a body moving on the water surface with velocities higher than 23.2 cm/s. The necklace vortex is produced as the result of a hydraulic jump, and is governed by the velocity of body, shape of body and Froude number. The intensity of necklace vortex can be reduced by fitting a spike, beak or sphere to the nose of the body. The vortices due to the hydraulic jump are also produced at the shoulder and back of the body.View full abstractDownload PDF (2888K) -
Determination of the Relative Signs of Optical Nonlinear Susceptibility Components of Sodium NitriteKuon Inoue, Takeo Ishidate1974 Volume 36 Issue 1 Pages 304
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
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Noboru Matsudaira, Sei-ich Takase1974 Volume 36 Issue 1 Pages 305
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
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Yoichi Kimura1974 Volume 36 Issue 1 Pages 306
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
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Takashi Iwai, Saburo Endo, Taizo Irie1974 Volume 36 Issue 1 Pages 307
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
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Toshio Fukushima, Shigeo Shionoya1974 Volume 36 Issue 1 Pages 308
Published: January 15, 1974
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (160K)