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Volume 51, Issue 6
Displaying 1-50 of 54 articles from this issue
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Kazu Nishigaki1982 Volume 51 Issue 6 Pages 1703-1704
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that the scaled superheat-limits for variety of liquids including neon—its superheating was observed in this work, are approximately represented by a simple universal function as (Tnucleation−Tcoext)⁄Tcritical\simeq0.68(Tcritical−Tcoext)⁄Tcritical, and that the empirical result can be explained in terms of a modified version of the Döring-Zeldovich-like nucleation theory by Langer and Turski.View full abstractDownload PDF (260K) -
Hideki Miyajima1982 Volume 51 Issue 6 Pages 1705-1706
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic field dependence of the magnetic susceptibility of Iron-Monosilicide FeSi was measured to investigate the mode-mode coupling for spin fluctuations. The susceptibility increases with magnetic field, and straight lines in Arrott plots have negative slope. These results suggest that mode-mode coupling for spin fluctuations is negative. This fact is in substantial agreernent with theoretical predictions proposed by Takahashi and Moriya on the basis of a unified picture of itinerant electron magnetism.View full abstractDownload PDF (256K) -
Masasi Inoue, Kazutoshi Fukui, Hisao Yagi, Toshiaki Tatsukawa1982 Volume 51 Issue 6 Pages 1707-1708
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA modified mutual inductance bridge has been used to measure ac magnetic susceptibility χ (frequency 155 Hz and intensity 8 Oe) of degenerate magnetic semiconductors Sn1−xMnxTe (x=1 at.%, 3 at.%, and 5 at.%) at liquid He temperatures. In contrast to the high-field (5 kOe) susceptibility data, the low-field susceptibility shows two magnetic transitions at the characteristic temperatures of TAHE (5–6 K) and Tm (4–5 K).View full abstractDownload PDF (244K) -
Hidetoshi Fukuyama1982 Volume 51 Issue 6 Pages 1709-1710
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is pointed out that the excitonic superconductivity proposed by Little will be possible along dislocations, since metallic linear paths can be formed, as the case may be, along dislocations in otherwise semiconducting (or insulating) bulk materials.View full abstractDownload PDF (256K) -
Atsuo Matsui, Hitoshi Nishimura1982 Volume 51 Issue 6 Pages 1711-1712
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBased on the observation of free exciton luminescence at room temperature, self trapping of excitons is recognized in β-perylene crystals which have a monomeric structure. Temperature dependence of the luminescence spectra suggests the existence of two sorts of self trapped states. The result obtained are consistent with those anticipated by the analysis of the Urbach rule in β-perylene.View full abstractDownload PDF (260K) -
Ichiro Fujiwara, Nobutsugu Imanishi, Tomota Nishi1982 Volume 51 Issue 6 Pages 1713-1719
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe independent isomer-yields of 132I(4+, 8−), 134I(4+, 8−), 135Xe(3/2+, 11/2−) and 138Cs(3−, 6−) have been measured in the thermal-neutron induced fission of 233U, 235U and 239Pu. From the isomer-yield ratios, the mean angular momenta of the primary fragements have been deduced on the basis of thc statistical analysis. Obtained results indicate that the primary angular momentum ⟨J⟩h is higher in odd-Z products than in even-Z ones, and increases up to a certain value at an approximate rate of −Δ⟨J⟩⁄Δ(δN)∼0.8 h with decreasing neutron displacements δN, which is defined as the difference between the number of neutron N in the products and the most probable neutron number Np in the isotopic yield distribution.View full abstractDownload PDF (820K) -
Toshihico Arimitsu1982 Volume 51 Issue 6 Pages 1720-1726
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGeneral formulation for open systems is given in terms of the time-convolution-less formulation of the damping theory. A diagramatic construction rule for the “kinetic coefficient” is given by introducing the mirror operation of the time evolution operator. The response function generalized to the open systems is derived by using the general formulation. Formally, the response function can be written in the same form as was given by Kubo by using the mirror commutator instead of the conventional one.View full abstractDownload PDF (700K) -
Yoko Hamano, Fumiaki Shibata1982 Volume 51 Issue 6 Pages 1727-1736
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOur previous theory of spin relaxation is extended to determine appropriate solutions for general cases without the narrowing condition. This is done by means of a consistent use of the projection operator formalism. The basic equation thus derived can be used for any time-scale.
Explicit solution is obtained for J=1⁄2 (J the magnitude of spin); there exists a correspondence between our quantum mechanical theory and a stochastic theory.View full abstractDownload PDF (740K) -
Isao Harada, Akio Kotani1982 Volume 51 Issue 6 Pages 1737-1744
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSCommensurate and incommensurate states of a Heisenberg spin-Peierls system in a magnetic field are studied within the mean-field approximation. Free energy, order parameter and magnetization are calculated numerically by taking account of the effect of all the accompanying harmonics. In particular, it is found that at low temperatures the field lowers the free energy of the incommensurate states and results in the commensurate to incommensurate phase transition. The nature of this transition is discussed. It is also found that the incommensurate to normal phase transition temperature behaves anomalously in a strong field. The resultant phase diagram is compared with the experimental data on TTF–CuBDT.View full abstractDownload PDF (976K) -
Hitoshi Sumi1982 Volume 51 Issue 6 Pages 1745-1762
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy transfer (ET) is greatly enhanced in a very short time after the initial electronic state was prepared by photon excitation. ET is assisted by violent lattice vibrations which have not been relaxed yet, when electrons interact strongly with phonons in the two electronic states (coupled by the matrix element J). An expression of the quantum yield of ET, which bridges the nonadiabatic (small J) and the adiabatic (large J) limits, is given as a function of time elapsed after pulsed excitation at an energy E. In the case of steady excitation, transitions during vibrational relaxation manifest themselves in a strong E dependence of the quantum yield. Generalization of Förster’s formula for ET in this dynamic regime is also mentioned. We use a formulation developed in the part I (J. Phys. Soc. Jpn. 49 (1980) 1701) which treat transitions after vibrational relaxation. The Landau-Zener formula plays an important role in describing ET.View full abstractDownload PDF (2232K) -
Kenichi Nanbu1982 Volume 51 Issue 6 Pages 1763-1768
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMolecular boundary conditions has a crucial effect on the correlation of velocity between two molecules. First, the effect is analysed by using a stochastic model for molecular reflection at the wall; the model is a combination of specular and diffuse reflection. As the percentage ζD of diffuse reflection increases, the correlation coefficient ρ drastically decreases; it is at most of order (ζDN)−1, N being the number of simulated molecules. Next, the effect is examined by analysing the data from actual simulation calculations. The behavior of the data is consistent with the magnitude of ρ determined by using the reflection model. If ρ is less than about 3%, the simulation data for any boundary conditions are essentially the exact solutions of the Boltzmann equation.View full abstractDownload PDF (664K) -
Hiroaki Kato, Motohiko Yamada, Hiroshi Yamauchi, Hidetoshi Hiroyoshi, ...1982 Volume 51 Issue 6 Pages 1769-1777
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic susceptibilities and magnetization isotherms have been measured for single crystal FeTiO3. The susceptibility parallcl to the c-axis has a large and sharp peak at TN=58.0±0.3 K, while the perpendicular susceptibility is almost independent of temperature below TN. Magnetization isotherm at 4.2 K with fields applied along the c-axis exhibits a typical metamagnetic transition at Hc=80.3±0.1 kOe, being the first observation of metamagnetism in 3d transition metal oxides. The transition is of the first order up to about 35 K, above which it is of the second order. The experimental data are well reproduced by molecular field calculations with the best fit parameters of the anisotropy field HA=150 kOe, the ferromagnetic intrasublattice exchange interaction of 2z1J1=28.5 K, and the antiferromagnetic intersublattice interaction of 2z2J2=−6.67 K.View full abstractDownload PDF (1056K) -
A. H. Nayyar1982 Volume 51 Issue 6 Pages 1778-1784
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is shown that in a hyperfine coupled system of nuclear and helically ordered electronic spins, an external magnetic field destroys the otherwise necessarily occuring zero-energy (Goldstone) mode, provided the external field is of the order of the hyperfine field. It is argued that the applied field acts against the internal hyperfine field in a manner such as to prevent the nuclear spins from following the electronic spins and thereby destroys the degeneracy of the ground state. Numerical calculations of the excitation energies of the coupled system for Holmium metal, as an example, are presented to show this conclusion explicitly.View full abstractDownload PDF (732K) -
Hiroshi Mori, Takeo Satoh, Haruhiko Suzuki, Taiichiro Ohtsuka1982 Volume 51 Issue 6 Pages 1785-1791
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHeat capacity data are presented for intermetallic compounds PrNi2, YNi2 and the pseudobinary system PrcLa1−cNi2. The temperature range covered is 2 to 80 K. The magnetic heat capacity deduced under certain assumptions shows that in PrNi2 the singlet Γ1 is the ground level and that the first excited level lies about 60 K above the ground level. An excess contribution is found around 10 K. The excess heat capacity is understood if the excited level is assumed to have appreciable broadening due to the exchange interaction acting between Pr atoms.View full abstractDownload PDF (940K) -
Yoshinori Takahashi, Michiyasu Tano1982 Volume 51 Issue 6 Pages 1792-1798
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe metamagnetism in the ground state and magnetic susceptibilities of Co(SxSe1−x)2 at finite temperature are discussed based on the recent spin fluctuation theory of Moriya-Takahashi. The critical field for the metamagnetic transition, the critical temperature, and the temperature dependence of the magnetic susceptibility are qualitatively and semi-quantitatively explained consistently with the use of the model density of state derived from the recent band structure calculation by Asano.View full abstractDownload PDF (800K) -
Ze Xianyu, Yoshikazu Ishikawa, Shigehumi Onodera1982 Volume 51 Issue 6 Pages 1799-1803
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin wave excitation has been studied by both inelastic neutron scattering and magnetization measurement for the amorphous Fe70Cr10P13C7 alloy which almost does not exhibit the invar properties. Well defined magnon groups have been detected around (0, 0, 0) at up to q=0.16 Å−1 for various temperatures below T≤0.9Tc. The spin wave stiffness constant Ds has been determined to be Ds=60±2 meVÅ2 by neutron scattering which is nearly in agreement with the value Dm=54±2 meVÅ2 derived by the magnetization measurement. The spin wave linewidth Γ varies with both wave vector q and temperature T as Γ∝q4T2 as predicted for the two-magnon interaction in the Heisenberg system.View full abstractDownload PDF (536K) -
Ryohei Nakata, Katsuyasu Kawano, Minoru Sumita, Eiichi Higuchi1982 Volume 51 Issue 6 Pages 1804-1810
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe line positions and intensities of the ESR from Eu2+ ions in SrF2 crystals have been investigated at room temperature and at 9.5 GHz. A perturbation calculation gives satisfactory results in their angular dependences when cross terms between the cubic crystal field (b4⁄60)·(O40+5O44) and the hyperfine terms AiS·Ii are taken into account. The relative sign of b4 and Ai can be determined from the angular dependence of the doublet separations in the forbidden transitions.View full abstractDownload PDF (780K) -
Nobuko Sakai, Ken-ichi Takemura, Kazuhiko Tsuji1982 Volume 51 Issue 6 Pages 1811-1816
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electrical resistance up to 250 kbar and down to 1.7 K, and the thermoelectric power up to 250 kbar at room temperature have been measured in iodine using a diamond-anvil cell. The resistance decreases rapidly and continuously with increasing pressure. The resistance anomaly has been found at 225 kbar and room temperature. The resistive characteristic temperature θ in the Grüneisen-Bloch equation is 225 K for metallic iodine at 235 kbar. The thermoelectric power decreases from a large positive value to a small positive one with increasing pressure and is +4±3 μV/deg at 240 kbar. These electrical properties have been discussed in relation to the structural change induced by pressure.View full abstractDownload PDF (792K) -
Keizo Murata, Takashi Ukachi, Hiroyuki Anzai, Gunzi Saito, Koji Kajimu ...1982 Volume 51 Issue 6 Pages 1817-1825
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTwo types of nonlinear effects in the electrical conductivity along the most conductive a-axis of (TMTSF)2ClO4 were observed near the superconducting transition temperature. Along the a-axis, the resistivity decreased as decreasing the temperature between 300 K and 5.5 K and turned to increase down to 1.07 K below which the superconductivity appeared. One of the nonlinearities was the increase in resistance up to a value greater than the normal one at a current just above the superconducting critical current. Along the c*-axis, the least conductive axis, such nonlinearity was not observed. The other is the decrease in resistance driven by the current much larger than the critical current, which seems to show the restoration of the metallic behavior. The influences of thermally induced microcracks on the temperature dependence of resistivity and to the nonlinearities are also presented.View full abstractDownload PDF (1072K) -
Akio Yoshimori, Jean-Loup Motchane1982 Volume 51 Issue 6 Pages 1826-1833
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe friction coefficient, η, of chemisorbed atoms on metal surfaces, originating from electronic fluctuation, is discussed on the Newns-Anderson model. Emphasis is put on the effects of electron correlation on the adatom, the resulting temperature dependence and position dependence of η. The Ward identity is found to be useful in deriving the compact expression for η in terms of the phase shift. An anomalous temperature dependence of the surface diffusion coefficient is shown as a possible example to examine the effect of η. Discussion is given on a relation between the expression of η and the “excess resistivity”, which is also related to the electromigration problem in bulk.View full abstractDownload PDF (844K) -
Tsuneaki Miyahara, Hiroyoshi Ishii, Takaaki Hanyu, Haruo Ohkuma, Shige ...1982 Volume 51 Issue 6 Pages 1834-1839
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOptical absorption coefficients of La, Ce, Sm, Eu and Gd metals have been measured in the photon energy range from 6 to 40 eV. Contribution of the 4f electrons to the optical absorption has not been observed in the present photon energy region. The 5p threshold of Ce, Sm, Eu and Gd does not show sharp absorption edge. The rounded edge indicates that the size of the 5p core hole should be larger than that in heavy simple alkali metals.View full abstractDownload PDF (780K) -
Yasuo Nozue1982 Volume 51 Issue 6 Pages 1840-1850
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDispersion relations of the multicomponent Z1,2 exciton-polaritons for K⁄⁄[111] and K⁄⁄[110] are determined by the two-photon-resonant Raman scattering via the excitonic molecule state, and there appears the significant anisotropy between them. These polariton dispersions are self-consistently analyzed by the theoretical forms of the symmetry-breaking effect due to a finite wave vector, where the K-linear, the heavy- and light-mass, and the warping effects are confirmed. The effective mass of the lowest molecular state is determined.View full abstractDownload PDF (1352K) -
Kazutaka Tsuji, Shuzo Takano1982 Volume 51 Issue 6 Pages 1851-1856
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSQuantum oscillations of shear acoustic wave were observed in p-Pb1−xGexTe (x=0.014) at liq. He temperatures. Three kinds of different branches of the frequencies were resolved by the Fourier analyses of the oscillations. By comparing with the theoretical model of the energy surfaces by Takaoka and Murase, these oscillations were identified as arising from the triplet up-, the triplet down- and the singlet down-state energy surfaces. The singlet up- energy surface is too small to be observed. From the ratios of the observed frequencies for magnetic field parallel to the major axis of the energy surfaces, we estimated ΔEv=0.006 eV and Ξu=0.06 eV where ΔEv is the downward shift of the valence band edge at L-point relative to that at T-point, Ξ is the optical deformation potential constant and u is the internal displacement of the sublattices.View full abstractDownload PDF (744K) -
Sadao Takaoka, Kazuo Murase1982 Volume 51 Issue 6 Pages 1857-1864
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe band edge structure modification of Pb1−xGexTe due to the structural phase transition has been investigated by means of the interband absorption and the Shubnikov-de Haas (SdH) effect. Below the phase transition temperautre (Tc) the band gap determined by the optical absorption increases with lowering temperatures or at least its temperature coefficient changes. From the SdH effect below Tc, we obtained the information of the carrier redistribution among the conduction (or valence) bands caused by the phase transition.
These results can be explained only when we take into account the effects of relative sublattice displacement and the homogeneous strain at the same time.View full abstractDownload PDF (1012K) -
Michihide Kitamura, Hirogi Iwata, Toshihiro Arai1982 Volume 51 Issue 6 Pages 1865-1870
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe optical absorption spectrum, D.C. conductivity, thermoelectric power and infrared (I.R.) reflection spectrum have been measured for (As2Se3)100−xGex (x=0, 1, 5, 10) glasses. The optical absorption coefficient were analyzed on the basis of the model proposed by Kolobov and Konstantinov and the D.C. conductivity and the thermoelectric power were analyzed on the basis of the model proposed by Emin. The adiabatic potentials of these materials were calculated from these results. We might conclude that the square of the electron-phonon coupling strength is directly proportional to the curvature of the adiabatic potential and that the proportional constant is approximately equal to the optical gap, Eopt, obtained experimentally.View full abstractDownload PDF (640K) -
Atsuo Matsui, Kenichi Mizuno, Motoaki Iemura1982 Volume 51 Issue 6 Pages 1871-1877
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe shape of the lowest exciton absorption band in α- and β-perylene due to the B2u←Ag transition, the halfwidth of the absorption band, and the steepness parameter of the Urbach tail are investigated. From linear temperature dependence of the halfwidth and the Lorentzian line-shape, the transition Au←Ag is well explained by the exciton band picture. The lattice relaxation behavior of excitons after they are formed is described by the strong exciton-phonon coupling scheme.
Based on the steepness parameter obtained, 0.93 in α-perylene and 1.38 in β-perylene, and the amount of the Davydov splitting obtained, 2040 cm−1 in α-perylene and 960 cm−1 in β-perylene, the lattice relaxation energy is estimated to be 1530 cm−1 and 523 cm−1 respectively. Also the energy difference between the free and self-trapped exciton states is expected to be 620 cm−1 in α-perylene and 43 cm−1 in β-perylene.View full abstractDownload PDF (940K) -
Hirokazu Tanaka, Itaru Tatsuzaki1982 Volume 51 Issue 6 Pages 1878-1883
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinewidths of the acoustic phonons propagated and polarized in the ab plane were measured for various scattering angles between π⁄6 and 5π⁄6 by the use of 4880 Å light. It was observed that the linewidths of the quasitransverse waves broaden as the temperature is lowered to the transition point; the linewidths of these phonon peaks depend not only on the direction, but also on the magnitude of their wave vectors. These results are discussed by taking into account of the piezoelectric interaction between the xy shear component of the acoustic phonons and the z-component of the polarization fluctuation.View full abstractDownload PDF (788K) -
Saburo Yokota1982 Volume 51 Issue 6 Pages 1884-1891
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOptical and X-ray examinations of CsHSeO4 were made above and below the phase transition point (Tc). CsHSeO4 undergoes an improper ferroelastic phase transition at 128°C and has spontaneous strains e130=2.7×10−2 and (e220−e110)⁄2=7.9×10−2 at room temperature. The crystal is tetragonal above Tc with the unit cell parameters at=bt=4.18 Å and ct=7.20 Å at 130°C, and exhibits a superlattice structure with the monoclinic unit cell parameters am\simeq2at and bm\simeq2bt below Tc. It is shown that if we assume 4⁄mmm as the point group above Tc, all the domain structures observed in CsHSeO4 below Tc, which disappear above Tc, can be deduced from the strain-compatibility relations for domain boundaries by taking account of the symmetry change from 4⁄mmm to 2⁄m associated with the phase transition.View full abstractDownload PDF (1228K) -
Hakaru Yamanaka, Masanori Hangyo, Yoshihiro Hishikawa, Riso Kato1982 Volume 51 Issue 6 Pages 1892-1899
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt has been found that the peculiar lines A, B, C, D and E which appear in the spectrum of the singlet luminescence in NaNO2 crystal are strongly enhanced when the crystal is doped with NO3− impurity. A number of sharp lines on the tail of the zero-phonon line of the singlet absorption in the crystal are also enhanced by NO3− impurity. From the excitation spectra for the luminescence lines, it is shown that both luminescence and absorption lines have common origins. They are interpreted as the lines due to the transition (Remark: Graphics omitted.) in NO2− ions which are perturbed by the presence of NO3− impurity in the crystal.View full abstractDownload PDF (852K) -
Ko Sugihara, Shusuke Ono, Hisashi Oshima, Kiyoshi Kawamura, Takuro Tsu ...1982 Volume 51 Issue 6 Pages 1900-1903
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLow field Hall coefficient R in well-crystalline graphite is positive at low temperatures. R reveals a maximum around 0.2 kOe at low temperatures and decreases rapidly with H→0. This trend can not be eplained without invoking the trigonal warping of the bands. The trigonal warping appreciably modifies the electron bands, and the harmonics induced by the trigonal warping corresponds to the appearance of the small effective mass carriers. This effect predominates over the contribution due to the holes around H-point. An exact calculation of R (H→0) is carried out for γ3=0.29 eV, and the comparison with our measurements (I. Experimental) is performed.View full abstractDownload PDF (492K) -
Atsushi Kurobe, Hiroshi Kamimura1982 Volume 51 Issue 6 Pages 1904-1913
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of intra-state correlation on the variable range hopping are investigated in the absence and presence of a magnetic field. In the absence of a magnetic field, Mott’s expression for the resistivity, ρ∝exp [T0⁄T]1⁄4, still holds in its temperature dependence. However, the prefactor T0 now depends on two types of localization lengths brought about by the intra-state correlation. Magnetoresistance is found to be positive due to the intra-state correlation. It shows a linear dependence on a magnetic field in lower magnetic fields and saturates above a certain magnetic field.View full abstractDownload PDF (1260K) -
Wilhelm Brenig1982 Volume 51 Issue 6 Pages 1914-1920
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonadiabatic corrections to the scattering formalism for the description of electron stimulated desorption developed previously are investigated. It turns out that the cross-section for the desorption of ions derived earlier in the Born-Oppenheimer approximation remains essentially unaffected by these corrections (nonadiabatic effects being taken into account with sufficient accuracy in terms of the imaginary part of the BO potential for the ions). The cross-section for the desorption of reneutralized ions, however, which vanishes in BOA becomes nonzero. In semiclassical approximation the expression for the cross-section agrees with the result proposed earlier by Menzel and Gomer. The connection of the formalism with the Landau-Zener theory of nonadiabatic transitions is briefly discussed.View full abstractDownload PDF (764K) -
Makoto Okusawa, Kouichi Ichikawa, Toshiyuki Matsumoto, Kenjiro Tsutsum ...1982 Volume 51 Issue 6 Pages 1921-1926
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe boron K emission and absorption spectra of LaB6, SmB6 and EUB6 have been measured to investigate the electronic band structure of the valence and conduction bands. For LaB6 the observed emission spectrum is compared with the photoelectron spectrum and also with the energy-band calculations by means of a self-consistent augmented-plane-wave method. The result suggests that the B K emission and absorption spectra are not influenced significantly by the presence of the localized 4f electrons of the rare-earth ion and provide information on the electronic band structure of rare-earth hexaborides.View full abstractDownload PDF (824K) -
Shoichi Annaka1982 Volume 51 Issue 6 Pages 1927-1931
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSInterference phenomena between the σ and π components of linearly polarized X-rays are studied in the Laue case dynamical diffraction. It is shown experimentally that the polarization characteristics of the diffracted X-rays from Si change clearly with thicknesses of the specimen and elliptically polarized X-rays are produced by phase differences between the σ and π components. Theoretical calculations also confirm the experimental results.View full abstractDownload PDF (492K) -
Yoshitada Murata1982 Volume 51 Issue 6 Pages 1932-1935
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA theoretical consideration in the formation of Kikuchi line concerning vibrational excitation is carried out from the double-scattering model of the Born approximation. The incident electrons excite a vibrational mode with an atomic displacement parallel to the incident wave vector. This result can be applied to estimate the magnitude of the surface rumpling.View full abstractDownload PDF (424K) -
Kiyoshi Ueda, Yasuo Ashizawa, Kuniya Fukuda1982 Volume 51 Issue 6 Pages 1936-1940
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRelative oscillator strengths for about 30 transitions from the metastable 5s5p 3P levels of neutral strontium have been determined by using the hook method. The metastable levels are populated by the DC discharge. The oscillator strengths are placed on an absolute scale by reference to a recent lifetime measurement and relative intensity measurements. Our results are in reasonable agreement with other experimental and theoretical values.View full abstractDownload PDF (580K) -
Kiyoshi Ueda, Masayoshi Karasawa, Kuniya Fukuda1982 Volume 51 Issue 6 Pages 1941-1947
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 4s4p 3P levels of Zn have been populated by a DC discharge and three series of measurements have been applied to observe the 4s4p 3P-4p2 3P multiplet at about λ2100 A. These are (1) precise measurement of the absorption profile for the 3P1-3P2 autoionizing transition, (2) total-absorption measurement for the same transition with simultaneous dispersion (hook) measurement for the 4s4p 3P1-4s5s 3S1 transition at λ4722 A, and (3) simultaneous hook measurements for the 3P-3P multiplet concerned and the 4s4p 3P-4s5s 3S visible multiplet. The autoionization rate of the 4p2 3P2 level is 4.72×1012 s−1 from (1). From (2) and (3) the gf values are 0.76, 0.68, 0.68 and 0.97 for 3P1-3P2, 3P0-3P1, 3P1-3P0 and 3P2-3P1, respectively, by reference to the absolute f values (∼0.14) for the visible multiplet.View full abstractDownload PDF (772K) -
Kiyoshi Ueda, Yoshihiro Hamaguchi, Kuniya Fukuda1982 Volume 51 Issue 6 Pages 1948-1952
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have measured Ar- and Kr-induced broadening of the Ca 4s2 1S-4snp 1P (6≤n≤10) and 4s2 1S-3d4p 1P transitions by means of the total absorption method. In this regime of n, the broadening cross section increases to its maximum value with n and then decreases. The maximum value is 28×10−14 cm2 at n=8 for Ar and 72×10−14 cm2 at n=9 for Kr. Assuming that the interatomic potential is described as a superposition of the Fermi potential and the polarization potential, we have calculated the cross section on the basis of the classical broadening theory. This calculation agrees well with both the present result and that for the Na 3S-nS transitions measured by Kachru et al. by means of the trilevel-echo technique.View full abstractDownload PDF (644K) -
Eiko Hiroike1982 Volume 51 Issue 6 Pages 1953-1957
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe indirect dephasing model for a vibrating molecule in a dense medium is succesively investigated by using the formulas obtained in the previous paper by the author. The line-shape function for the spectrum of the high-frequency mode is obtained, and the dependence of the line-width of the spectrum on the life-time of the excited state of the low-frequency mode is discussed.View full abstractDownload PDF (464K) -
Kazuya Uehara, Takumi Yamamoto, Tsuneyuki Fujii, Norio Suzuki, Tsuyosh ...1982 Volume 51 Issue 6 Pages 1958-1964
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBoundary plasma of a circular tokamak has been investigated by means of electrostatic probes during lower-hybrid heating. The reflection coefficient is affected by the density gradient in front of the Iauncher. An effective ion heating is performed in the main plasma region when the boundary electron temperature is relatively high enough to suppress the parametric decay instabilities. The simultaneous injection of neutral beams as well as the lower-hybrid wave brings the suppression of instabilities with increase of the electron temperature coming from the neutral beam heating.View full abstractDownload PDF (928K) -
Kanemitsu Katoh1982 Volume 51 Issue 6 Pages 1965-1968
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA formalism for the parametric instability with low-frequency magnetic field generation in a collisional plasma is developed. The spontaneous low-frequency magnetic field results from a resonant decay instability of an intense pump wave into a magneto-static wave which appears only in a collisional plasma. The growth rate for a resonant decay instability of an intense electromagnetic wave into a Langmuir wave and a magneto-static wave is obtained.View full abstractDownload PDF (380K) -
Masahiro Wakatani, Tetsuji Abe1982 Volume 51 Issue 6 Pages 1969-1974
Published: June 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMulti-helicity tearing modes are studied by use of reduced MHD equations based on a stellarator expansion. The l=2 stellarator field has a tendency to limit magnetic braiding due to non-linear coupling between m=2⁄n=1 and m=3⁄n=2 tearing mode. For small external rotational transform of (Remark: Graphics omitted.), however, disruption may occur for current profiles susceptible of it in a tokamak.View full abstractDownload PDF (596K) -
Masayoshi Taguchi1982 Volume 51 Issue 6 Pages 1975-1982
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple expression of the fast-ion-induced current in the toroidal magnetic field is obtained by use of the adjoint drift-kinetic equation for electrons. The inverse aspect ratio is assumed to be small. The lowest-order terms of this ratio are retained in the calculation. By this expression, the beam-induced current for any beam distribution is easily evaluated. When the fast ions are monoenergetic, the beam-induced current is practically computed.View full abstractDownload PDF (648K) -
Akira Yoshizawa1982 Volume 51 Issue 6 Pages 1983-1991
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe transport equation for energy dissipation rate in turbulent shear flows is examined by the use of a statistical theory, which is founded on the Direct-Interaction formalism as well as on the separation between the space and time scales of the mean and fluctuating fields. Various quantities appearing in the equation are expressed in terms of the turbulent energy and the energy dissipation rate as well as the mean velocity. On this basis, discussion is made on a model equation for energy dissipation rate which is frequently used in the turbulence closure models. As a result it is suggested that the usual model equation is not always justifiable from the standpoint of a statistical shear-turbulence theory.View full abstractDownload PDF (872K) -
Koichi Tanaka, Shinya Ishii1982 Volume 51 Issue 6 Pages 1992-1999
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSScattering of a plane wave by a flow field induced by a vortex pair in translational motion is considered. The analysis of the scattered wave is facilitated by first order equations with respect to the wave component together with the Born approximation and by applying the Green’s function method. The directional distribution of the scattered wave and the total scattering cross section of the vortex pair are evaluated. Further, temporal variation of the scattered acoustic pressure,when the vortices pass by an observer fixed in space, is also plotted.View full abstractDownload PDF (712K) -
Kaoru Fujimura1982 Volume 51 Issue 6 Pages 2000-2009
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe linear stability of Jeffery-Hamel inflow profiles is investigated on the basis of quasi-parallel theory. It is found that the critical Reynolds number Rc increases monotonically as the shear stress at the wall τw increases and even a very small angle between the walls of a channel has a remarkable stabilizing effect. The critical phase velocity cc reaches an asymptotic value of 0.1844 as τw→∞. Comparison of neutral stability curves from the Jeffery-Hamel flow and the two dimensional inlet flow is also discussed. Two kinds of approximations are made to asymptotic viscous solutions of the Orr-Sommerfeld equation, and the stability characteristics based on these approximations are compared with an exact solution obtained by using the step-by-step integrating procedure.View full abstractDownload PDF (1132K) -
G. Mandal, K. K. Mandal, G. Choudhury1982 Volume 51 Issue 6 Pages 2010-2015
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of Hall current on Couette flow and heat transfer of a conducting fluid between two plates in a rotating system are discussed. Both Hall and rotation parameters introduce secondary velocity and secondary induced magnetic field. The resultant shear stress and heat transfer from the moving plate has been calculated assuming it to be non-conducting and taking the fixed plate to be infinitely conducting. The resultant shear stress increases with increase in Hartmann number as well as rotation parameter while it decreases with increase in Hall parameter. The role of each parameter on heat transfer is always opposite to its role on shear stress. In the absence of Hall current this opposing character remains unalterned even if direction of rotation is reversed.View full abstractDownload PDF (628K) -
Mitsuhiro Tanaka1982 Volume 51 Issue 6 Pages 2016-2023
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonlinear self-modulation of waves propagating along the interface between two homogeneous liquid layers is investigated by means of the derivative expansion method. The stability characteristics of a uniform wavetrain are examined on the basis of the nonlinear Schrödinger equation. It is shown that the existence of the upper layer suppresses the modulational instability. Some limiting cases are discussed in connection with the Korteweg-de Vries equation and the Benjamin-Ono equation.View full abstractDownload PDF (820K) -
C. Shen, V. C. Liu1982 Volume 51 Issue 6 Pages 2024-2028
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe stationary two-dimensional (x, z) near wakes behind a flat-based projectile which moves at a constant mesothermal speed (V∞) along a z-axis in a rarefied, fully ionized, plasma is studied using the wave model previously proposed by one of the authors (VCL). One-fluid theory is used to depict the free expansion of ambient plasma into the vacuum produced behind a fast-moving projectile. This nonstationary, one-dimensional (x, t) flow which is approximated by the K-dV equation can be transformed, through substitution, t=z⁄V∞, into a stationary two-dimensional (x, z) near wake flow seen by an observer moving with the body velocity (V∞). The initial value problem of the K-dV equation in (x, t) variables is solved by a specially devised numerical method. Comparisons of the present numerical solution for the asymptotically small and large times with available analytical solutions are made and found in satisfactory agreements.View full abstractDownload PDF (604K) -
Miki Wadati, Kenji Ohkuma1982 Volume 51 Issue 6 Pages 2029-2035
Published: June 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNew types of solutions of completely integrable nonlinear evolution equations are found using the inverse scattering method. For the Modified Korteweg-de Vries equation the multiple-pole solutions, i.e., the solutions which correspond to multiple-pole of the reflection coefficient are investigated. Double-pole soltuion and triple-pole solution are obtained explicitly. It is shown that those solutions describe a weak-bound state of solitons and antisolitons.View full abstractDownload PDF (692K)