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Masahiko Teranaka, Osamu Kusumoto, Toru Okusawa, Toshio Hara, Yutaka N ...
1982 Volume 51 Issue 7 Pages
2039-2040
Published: July 15, 1982
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The distributions of
ns and
Ng in proton-nucleus interactions were investigated in the regions of 4≥
Nh≥1 and
Nh≥18 making use of the nuclear emulsion pellicles exposed to 205 and 405 GeV proton beams, respectively. ⟨
ns⟩⁄
D (dispersion of
ns) of high
Nh is significantly large compared with that of low
Nh. It can be considered that ⟨
ns⟩⁄
D increases as ν (the number of target nucleons encountered with incident proton). KNO distribution may scale to the center of mass energy at a definite value of ν.
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Nobuyoshi Yamada, Takeichiro Ohashi, Tetuo Ohoyama
1982 Volume 51 Issue 7 Pages
2041-2042
Published: July 15, 1982
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From the magnetization measurement on single crystal, two magnetic first-order transitions have been found for ζ-Mn
2.6,Ge. The one is at
Tt1=120 K and the other at
Tt2=310 K in a magnetic field of 10 kOe, both associated with abrupt increase in the magnetization. The easy axis of magnetization is perpendicular to the trigonal symmetry axis in a range of temperature above
Tt1, and parallel at temperatures above
Tt2. The entropy changes at these transitions have been estimated from the dependence of the transition temperature on magnetic field to be
ΔS1=6.8×10
3 erg/K g and
ΔS2=2.0×10
3 erg/K g.
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Norio Kawakami, Ayao Okiji
1982 Volume 51 Issue 7 Pages
2043-2044
Published: July 15, 1982
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The calculation is done exactly for the asymmetric Anderson Hamiltonian, of the average number of localized electrons and of the charge susceptibility.
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Yuzi Takakuwa, Shinichi Takahashi, Shoji Suzuki, Shozo Kono, Tatsuo Yo ...
1982 Volume 51 Issue 7 Pages
2045-2046
Published: July 15, 1982
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It has become evident that the four-components structure in Yb metal 4f levels is due to surface effect of intrinsic nature.
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Hirofumi Ozeki, Akikatsu Sawada
1982 Volume 51 Issue 7 Pages
2047-2048
Published: July 15, 1982
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The temperature dependence of elastic constant
C66 in LiCsSO
4 crystal was measured by means of ultrasonic method. It has been found that
C66 shows softening as the normal-ferroelastic phase transition temperature (
Tc=−71.0°C) is approached from above. LiCsSO
4 crystal is the first case among the family of (NH
4)
2SO
4 type crystal which shows acoustic softening at the normal-ferroelastic phase transition.
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Katsuhiko Hasebe, Hiroyuki Mashiyama, Sigetosi Tanisaki
1982 Volume 51 Issue 7 Pages
2049-2050
Published: July 15, 1982
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The space groups of seven phases of {N(CH
3)
4}
2CoCl
4 were determined by X-ray diffraction as
Pmcn(Z=4), incommensurate,
P2
1cn(Z=20), incommensurate,
P112
1⁄
n(Z=12),
P12
1⁄
c1(Z=4) and
P2
12
12
1(Z=12), respectively in the order of decreasing temperature. These phases are characterized by the change of the cell dimension of the pseudo-hexagonal axis:
c0, ∼5
c0, 5
c0, ∼5
c0, 3
c0,
c0 and 3
c0, respectively.
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Kazuo Gesi
1982 Volume 51 Issue 7 Pages
2051-2052
Published: July 15, 1982
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Effect of hydrostatic pressure on the successive phase transitions in {N(CD
3)
4}
2CoCl
4 was studied by dielectric measurements. As pressure increases, the I–II, II–III, and III–IV transition temperatures (23.7°C, 8.3°C, and 4.2°C at 1 atm, respectively) linearly increase with the ratios of 135 deg GPa
−1, 227 deg GPa
−1, and 205 deg GPa
−1, respectively. The ferroelectric III phase disappears at 0.099 GPa and 30.8°C. The effect of deuteration on the transition sequence is equivalent to application of hypothetical negative pressure of −0.05 GPa.
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Mitsuo Harada
1982 Volume 51 Issue 7 Pages
2053-2054
Published: July 15, 1982
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By means of X-ray diffraction measurements, it was found that RbCuCl
3 undergoes successive structural phase transitions at −10°C and 66°C. Superlattice reflections are observed at (
h,
k±1⁄2,
l) in Phase II (66°C>
T>−10°C) and at (
h,
k,
l±1⁄2) in Phase III (
T<−10°C), respectively. Phase I (
T>66°C) is hexagonal with one of following space groups;
P6
3⁄
mmc,
P\bar62
c and
P6
3mc (
Z=2), and Phase II is orthorhombic with space group
Pbcn (
Z=4).
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Yoshiyuki Ono
1982 Volume 51 Issue 7 Pages
2055-2056
Published: July 15, 1982
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From self-consistent determination of the dynamical diffusion coefficient, the Fermi energy dependence of the localization length, ξ(
EF), is obtained for the case where the Fermi energy,
EF, lies near the center of the lowest Landau subband. If the energy is measured from the point where the real part of the retarded Green’s function vanishes, ξ(
EF) for small |
EF| is expected to be proportional to
l exp (γ
2⁄
EF2) with
l the cyclotron radius and γ a constant of the order of subband width.
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Akira Nakamura
1982 Volume 51 Issue 7 Pages
2057-2058
Published: July 15, 1982
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We study the so-called completely integrable nonlinear evolution equation. Recently it has been found that certain two-space-dimensional nonlinear evolution equations have not only well-known soliton solutions but also simple (similarity type) explode-decay mode solutions expressed by a closed form of simple analytic functions. In the one-space-dimensional system, so far, there have been no known example which admit simple explode-decay mode solutions as well as solitons. We have found one explicit example which has such property.
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Kazuo Asakimori, Naozumi Jogo, Tadashi Kameda, Toshiro Maeda, Kentaro ...
1982 Volume 51 Issue 7 Pages
2059-2067
Published: July 15, 1982
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Extensive air showers with sizes from 8×10
4 to 5×10
6 particles were observed by the scintillator array in Kobe University near sea level. Results obtained in the experiment are as follows:
(1) The lateral distribution of EAS is well expressed by the NKG function of single age parameter in the range distance from 1 m to 50 m from the core.
(2) The average age parameter of EAS decreases with increasing shower size and approaches a constant value, and the fluctuation of age parameters decreases with increasing shower size monotonously.
(3) The absorption length
Λabs of EAS is almost constant in the observed size range, and it is 117±8 g/cm
2.
(4) The integral size spectrum of EAS in the size range 8×10
4—5×10
6 can be expressed by a power law of single exponent, i.e.
I(≥
Ne)=(3.01±0.34)×10
−6(
Ne⁄10
5)
−1.87±0.05⁄m
2.s.sr.
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Jun Schimizu
1982 Volume 51 Issue 7 Pages
2068-2074
Published: July 15, 1982
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A statistical analysis has been performed on the excitation functions for the
20Ne(
16O,
20Ne)
16O and
20Ne(
16O,
12C)
24Mg reactions from
Ecm=22.8 MeV to 38.6 MeV at θ
L=13°. Results of this analysis suggest a large direct component. It is concluded that four peaks in the deviation function for the
20Ne(
16O,
12C)
24Mg reaction is of nonstatistical origin.
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Fumiaki Shibata, Toshihico Arimitsu, Yoko Hamano
1982 Volume 51 Issue 7 Pages
2075-2081
Published: July 15, 1982
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With the use of the basic equation derived in the previous paper, the exchange dephasing phenomena are examined by a quantum theory of random frequency modulation. Under a certain circumstance a quantal stochastic process is shown to be the Gaussian-Markoffian process. Time-correlation function and power spectrum are obtained: Temperature dependence of frequency shift and width of line shape is also determined.
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Wei Min Hu, John D. Dow
1982 Volume 51 Issue 7 Pages
2082-2084
Published: July 15, 1982
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Calculations of the density of states for the three-dimensional simple-cubic Anderson model are reported for various disorder strengths
W.
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Yoko Hamano, Fumiaki Shibata
1982 Volume 51 Issue 7 Pages
2085-2088
Published: July 15, 1982
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Detailed analysis on temperature effects in the spin relaxation process is performed from a microscopic point of view. This is done by specifying the reservoir: Two simple models are employed for the reservoir, namely, systems composed of free fermions and bosons.
Although the models are simple enough, several interesting results are obtained for temperature variations of the line shape. Explicit calculations are given to typical cases. Not only the usual narrowing, broadening but also unexpected features are found for the temperature variations of the line shape. Whether these effects occur or not crucially depends on properties of the reservoir.
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Kazuo Nakanishi, Hiroyuki Shiba
1982 Volume 51 Issue 7 Pages
2089-2097
Published: July 15, 1982
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Mean field calculations are performed to study an Ising spin model on a triangular (actually hexagonal) lattice in which the couplings up to the next nearest neighbor and the magnetic field are taken into account. Special attention is focused on possible long-period modulated structures at finite temperatures. It is shown that for antiferromagnetic couplings higher order commensurate structures with a triangular domain structure are stable in a wide temperature range. The mechanism stabilizing those structures is discussed explicitly by using domain boundaries as a key concept and the Ginzburg-Landau type free energy. Finally the theory is applied to the order-disorder transition of β-eucryptite (β-LiAlSiO
4) and compared with experiment.
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Keiichiro Nasu, Yutaka Toyozawa
1982 Volume 51 Issue 7 Pages
2098-2106
Published: July 15, 1982
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Stable and metastable phases of a one-dimensional many-electron system with short range electron-electron (e–e) repulsion and site-diagonal electron-phonon (e–p) interaction are studied within the mean field theory and in the adiabatic limit. The total energy of the system is calculated as a function of the three parameters: the transfer energy of the electron between neighbouring two sites
T, the on-site e-e repulsive energy
U and the e–p coupling energy
S. The resultant phase diagram is such that the “
T-
U-
S triangle” is bisected into the SDW and the CDW regions by the border-line with
U=
S. The metastable SDW (CDW) phase exists in addition to the stable CDW (SDW) phase in a narrow region around the bisector. The border-lines for the metastable phases and the bisector between the two stable phases flow together into the
T-
vertex of the triangle, indicating the intriguing instability of one-dimensional metal against
U and
S.
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Yukimasa Yoshida, Kazuko Motizuki
1982 Volume 51 Issue 7 Pages
2107-2115
Published: July 15, 1982
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Lattice instabilities of 1
T-VSe
2, CrSe
2, and TiS
2 are studied on the basis of the band-type Jahn-Teller mechanism. The wave number and mode dependences of electron-lattice interaction and the generalized electronic susceptibility are calculated for each compound by using modified bands of 1
T-TiSe
2. The results are discussed in connection with possible distortions.
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Izumi Iwasa, Hideji Suzuki
1982 Volume 51 Issue 7 Pages
2116-2122
Published: July 15, 1982
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Longitudinal sound velocity was measured in bcc
3He crystals doped with
4He up to 1600 ppm. The velocity usually decreased with increasing temperature, independent of the frequency between 10 and 50 MHz. The relative change in the velocity
Δv⁄
v0 was well fitted to an expression,
Δv⁄
v0=
k(
B1⁄
B0)+
l(
B2⁄
B0), where
B1⁄
B0∝
T4 and
B2⁄
B0∝e
−φ⁄T were respectively the relative changes in the adiabatic bulk modulus due to phonons and vacancies, and φ\simeq6 K was the vacancy formation energy. It was found that
k=−1.1∼−1.7 and
l=−0.4∼−1.0 depending on the crystal, and that the two terms in
Δv⁄
v0 were comparable in magnitude at
T=
Tm. When a crystal with 480 ppm
4He was cooled below 80 mK, the velocity decreased and became amplitude-dependent because of dislocations multiplied due to phase separation. At higher temperatures, however, no dependence of the velocity on the
4He concentration was observed.
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Yasunari Kurihara
1982 Volume 51 Issue 7 Pages
2123-2130
Published: July 15, 1982
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We investigate dynamical susceptibilities associated with fluctuations of an amplitude and a phase of the incommensurate spin density wave of chromium using a model Hamiltonian within the framework of the random phase approximation. They couple with charge density fluctuations with transfer momemtum
q. The energy of the collective motion related to the amplitude fluctuation of the spin density wave (SDW) agrees with the energy gap of the single excitations in the limit
q→0. The susceptibility related to the phase fluctuation has not a pole due to their coupling though the intensity of it has a peak and its peak height increases like
q−2 with decreasing
q.
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Yûichi Tazuke, Toshikazu Sato, Yoshihito Miyako
1982 Volume 51 Issue 7 Pages
2131-2135
Published: July 15, 1982
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Polycrystalline sample of V
3S
4 without ferromagnetic impurity phase was prepared. Effective magnetic moment of ∼0.2 μ
B/V was observed from susceptibility measurement. Specific heat was measured by a heat pulse method in 2 K<
T<20 K. Large linear electronic specific heat γ
T with γ=(26.5±2) mJ/K
2·mole was observed above 12.7 K. The electronic specific heat deviates from γ
T below 12.7 K. The deviation cannot be explained by a localized moment model. These data are characteristic to an itinerant weak antiferromagnet.
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Yasunari Kurihara
1982 Volume 51 Issue 7 Pages
2136-2142
Published: July 15, 1982
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It is well-known that the dynamical matrix is represented by the inverse dielectric matrix. We show that the temperature dependent part of the velocity of the longitudinal acoustic phonon can be given by only one element of the dielectric matrix ε(
q,
q) in the ordered state of Cr if the random-phase approximation is applicable and the Bloch wave functions can be expressed by the atomic orbital functions for the system. The same result hold in other metals if above conditions are satisfied. In the limit
q→0 the element ε(
q,
q) has the intimate relation with the density of states at the Fermi energy even in the ordered state of Cr which decreases with decreasing temperatures. Our theory gives one of reasons of the remarkable increase of the compressional constant
C11 of single crystals of Cr in the spin density wave state with decreasing temperatures.
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Toshikazu Sato, Yoshihito Miyako
1982 Volume 51 Issue 7 Pages
2143-2150
Published: July 15, 1982
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Specific heat of
PtMn (3.0, 3.7 and 5.0 at.%Mn) has been measured from 0.5 up to 20 K. Low temperature magnetic specific heat at
T<<
Tg is not linear in temperature and is well fitted by A
T+B
T2. The coefficients A and B depend on Mu concentration and A=13.6, 6.8 and 1.0 (mJ/K
2·mole), B=9.0, 8.4 and 6.0 (mJ/K
3·mole) for 3.0, 3.7 and 5.0 at.%Mn
PtMn alloys, respectively. This low temperature behavior of the specific heat can be quantitatively explained by a spin wave excitation. The spin wave spectrum was assumed to be given by the step function.
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Kinshiro Hirakawa, Hideki Yoshizawa, Koji Ubukoshi
1982 Volume 51 Issue 7 Pages
2151-2158
Published: July 15, 1982
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It has been reported that the phase transition in K
2CuF
4 is essentially caused by the Kosterlitz-Thouless-type transition slightly modified by the three-dimensional interaction. In order to check this, we have performed a neutron critical scattering study over a wide range of temperature and
q space. All of the observed critical parameters including κ, ξ and η as well as the crossover in temperature and field scales are consistent with the previous magnetic study.
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Osamu Terasaki
1982 Volume 51 Issue 7 Pages
2159-2167
Published: July 15, 1982
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The Au–Zn alloys with the incommensurate two-dimensional antiphase structure of Cu
3Pd-type, containing 15.3 to 18.9 at.%Zn, were investigated by high resolution structure imaging and electron diffraction methods with a 1000 kV electron microscope, and “domain-like” atomic arrangement was revealed for the 17.2, 17.6 and 18.3 at.%Zn alloys. Two types of “domains” with the same unit cell size of 6
a×5
c but different configurations, which are the derivatives of the Cu
3Pd-type structure, occur by turns along the [100] and [001] directions. The shape of the “domains” and the distances between them change with composition, and the relative configuration of “domains” produces the incommensurate structures, which explain well all the superlattice spots observed on the electron diffraction patterns.
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Giyuu Kido, Noboru Miura, Hideo Ohno, Hiroyuki Sakaki
1982 Volume 51 Issue 7 Pages
2168-2173
Published: July 15, 1982
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Magnetophonon resonance in a two-dimensional electron system at the interface of GaAs–Al
xGa
1−xAs heterojunction was investigated using pulsed high magnetic fields up to 35 T. The fundamental peaks with a harmonic number
N=1 was observed for the first time. The polaron mass of 0.0745±0.0015 m
e was determined by the analysis of the oscillatory resistance change using the LO phonon energy of GaAs. This value was successfully interpreted in terms of the non-parabolicity of the conduction band in GaAs taking into account the two dimensionality of the electronic state. A remarkably large damping of the oscillation was observed in spite of the large electron mobility.
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Yasusada Yamada, Ihachi Naiki
1982 Volume 51 Issue 7 Pages
2174-2180
Published: July 15, 1982
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A thermodynamical treatment has been developed in order to elucidate the phase transition mechanism of higher stage alkalimetal graphite intercalated compounds. In particular, the properties of discommensurations or domain-like structure associated with the mass density waves of alkali-metals have been investigated. Both the shape and the size of the calculated domain structure are in good agreement with the observed results on C
24Rb and C
24Cs. Possibility of stacking ordering of discommensurations along the
c-direction in lower temperatures is also discussed.
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P. Palanichamy, S. P. Singh, S. K. Sharma
1982 Volume 51 Issue 7 Pages
2181-2185
Published: July 15, 1982
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Following the new formalism of Sharma and Kaw for energy dependent relaxation times, we solve the Boltzmann equation to calculate the conductivity tensor and absorption coefficient when an acoustic wave propagates through a non-degenerate piezoelectric semiconductor in the presence of an external d.c. field. The mixed scattering of electrons by ionized impurity as well as by piezoelectric potential have been taken into account. The dependence of threshold drift velocity, required for amplification, on the scattering parameter ν
0p⁄ν
0i has been investigated.
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Shin-ichiro Narita, Takahisa Shinbashi, Michihiro Kobayashi
1982 Volume 51 Issue 7 Pages
2186-2193
Published: July 15, 1982
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Some properties of D
− centers which are characteristic of multi-valley semiconductors have been investigated by means of far-infrared photoconductivity. They have revealed themselves particularly in the differences of the uniaxial stress and magnetic field effects on the D
− centers between Si(P), [or Si(As)] and Si(Li). The experimental results have been compared with the theories.
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Toshihiro Oshikiri, Yositaka Onodera
1982 Volume 51 Issue 7 Pages
2194-2198
Published: July 15, 1982
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Wave-number dependence of exciton longitudinal-transverse splitting was considered in a previous paper, where a microscopic calculation of the electron-hole exchange interaction was shown to account for experiment on CuCl. In this paper, macroscopic approach, based on considerations on the dielectric function, is taken to the same problem. For exciton with finite wave number, it is necessary to distinguish between longitudinal and transverse oscillator strength; the former is proportional to the longitudinal-transverse splitting of exciton. Equivalence of the two approaches is proved.
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Kazuaki Tsuchida, Shigeo Imaizumi, Ryuji Abe, Ikuo Suzuki
1982 Volume 51 Issue 7 Pages
2199-2204
Published: July 15, 1982
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ESR spectra of Mn
2+ doped in {N(CH
3)
4}
2CoCl
4 crystal were observed in the phases I, II, III, IV and V. From the temperature dependence of the spectra around three crystallographic axes, it was concluded that the incommensurable modulation wave rotated the CoCl
4 tetrahedra around the
c-axis in the incommensurate phase. The amplitude of the modulation wave has the temperature dependence of
Δ\varphi∝(
TI−
T)
0.35 from 11°C to 21°C. The rotation angles of CoCl
4 tetrahedra around the
c-axis were determined in the commensurate phase.
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Kazuo Gesi, Kunio Ozawa
1982 Volume 51 Issue 7 Pages
2205-2208
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The pressure-temperature phase diagram of ferroelectric {N(CH
3)
4}
2CuBr
4 was studied by dielectric measurements. The I–II, II–III, and III–IV transition temperatures (−2.5°C, −33.2°C, and −37.3°C at 0 GPa, respectively) all in-creases with increasing pressure with the rates of 97 deg GPa
−1, 120 deg GPa
−1, and 370 deg GPa
−1, respectively. As pressure increases the ferroelectric III phase terminates at the II–III–IV triple point at 0.016 GPa, −31.3°C. Also the incommensurate phase of II terminates at the I–II–IV triple point at 0.191 GPa, 16.0°C.
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Ikuo Suzuki, Yoshihiro Ishibashi
1982 Volume 51 Issue 7 Pages
2209-2212
Published: July 15, 1982
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The ferroelectric transition in a two-sublattice system with an asymmetric double minimum potential is of the second or the first order according to the values of model parameters. It has turned out that the tricritical point can exist when such parameter values satisfy some conditions. Several possible phase diagrams are presented as examples, and discussed.
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Takeshi Hiraoka
1982 Volume 51 Issue 7 Pages
2213-2217
Published: July 15, 1982
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Hall effect in PrIn
3 has been measured from 4.2 to 300 K. The extraordinary Hall resistivity which is obtained by subtracting the effect in YIn
3 from that in PrIn
3 is almost temperature independent at low temperatures and changes sign from negative to positive at about 20 K and reaches a maximum at about 30 K. This behavior is compared with the calculated curves which are based on the skew-scattering and side-jump mechanisms of conduction electrons by Pr ions under the influence of crystalline electric field (CEF). It is shown that these mechanisms can reproduce the temperature dependence of the experimental result fairly well with the CFE parameters which are a little different from the reported values deduced from the susceptibility measurement.
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Keisaku Kimura, Hiroo Inokuchi
1982 Volume 51 Issue 7 Pages
2218-2225
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Electrical conductivity of the thin film of cytochrome
c3, electron carrier protein of anaerobic bacteria, was measured as a function of ferri- to ferro-ratio. At the initial reduction stage of ferric cytochrome
c3, the conductivity was gradually increased and was explained by doping effect. This was the first observation of doping effect for biological molecules. At 0.95 ferro-ratio, the conductivity was abruptly increased. The observation was analysed by the percolation theory which predicts that there is very strong heme-heme interaction between fully reduced cytochrome
c3 molecules in a condensed phase.
The anomalous physico-chemical behaviors of ferrocytochrome
c3 film such as very low ionization potential and intermolecular heme-heme interaction observed by Mössbauer spectroscopy were also discussed in relation to the present results.
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Yoshikazu Hirose, Koichi Shimomae, Chihiro Hamaguchi
1982 Volume 51 Issue 7 Pages
2226-2232
Published: July 15, 1982
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Magnetophonon resonance experiments of transverse magnetoresistance are performed in n-Ge at
T=100∼250 K. Magnetophonon oscillations due to both intravalley and intervalley scattering processes are observed. The band edge masses are determined to be
mt=0.0823
m0 and
m1=1.59
m0 at
T=120 K. The temperature dependence of
mt is found to be very weak in the temperature range 100 to 250 K and interpreted by the
k·
p theory. Fourier transform of the present data reveals a fundamental field 36 T in the case of
B⁄⁄⟨100⟩, which is ascribed to the intervalley magnetophonon resonance due to the degenerate LA and LO phonons at the X
1 point (349 K). Deformation potential ratio of the intervalley to intravalley phonon scattering is determined for the first time to be 0.28±0.07, which yields (5.71±1.8)×10
8 eV/cm for the deformation potential of the intravalley LO phonon scattering.
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Toshiki Iwasaki, Noritaka Kuroda, Yuichiro Nishina
1982 Volume 51 Issue 7 Pages
2233-2240
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The frequencies of A
2u phonons of the layer compounds ZrS
2 and HfS
2 are determined from two phonon resonant Raman scattering. The analysis based on the polarizable ion model by van der Valk and Haas suggests that the long-range Coulomb interaction plays an important role in the anisotropy of lattice dynamics. The A
1g phonon spectrum of ZrS
2 exhibits anomalous line shape induced by the hybridization of the A
1g phonon with the A
2u(LO).
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Yoshiyuki Morioka, Ichiro Nakagawa
1982 Volume 51 Issue 7 Pages
2241-2246
Published: July 15, 1982
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Raman spectra of K
3Co(CN)
6 crystals have been observed at temperatures down to 30 K. The lowest frequency band in the low temperature phase, ∼13 cm
−1 at 30 K, softens to 5 cm
−1 near the transition temperature (∼63 K). This soft mode behavior shows that the phase transition is displacive one. Since no soft optically active modes are found in the high temperature phase, the instability of the high temperature lattice is ascribed to the zone boundary phonon.
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Yoshio Kaneko, Koichi Morimoto, Takao Koda
1982 Volume 51 Issue 7 Pages
2247-2254
Published: July 15, 1982
Released on J-STAGE: May 29, 2007
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Single crystals of alkaline-earth chalcogenides, CaS, CaSe, SrS, SrSe, BaS and BaSe, have been prepared by the floating-zone method using a Xe-arc image furnace. Details of the crystal growth technique are described. As the first report of our studies on the optical properties of these IIa–VIb compounds, the infrared reflection spectra due to the optical phonons are presented. From a dispersion analysis of the spectra, the frequencies of transverse and longitudinal optical phonons and related dispersion parameters are determined. Discussions are made on the effective charges and the chemical trend of these binary compounds.
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Takashi Oshiyama, Michi-hiko Mannami
1982 Volume 51 Issue 7 Pages
2255-2262
Published: July 15, 1982
Released on J-STAGE: June 01, 2007
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The parameters in the Fokker-Planck equation to describe the depth dependence of fraction of channelling particles are calculated numerically from the scattering probabilities of axial channelling particles which suffer from the collisions with electrons and thermally vibrating chains of atoms. The fractions of channelling particles for high energy H
+ and He
++ ions are obtained by solving the Fokker-Planck equation and compared with the experimental data of axial dechannelling. It is shown from the numerical calculations that the Fokker-Planck equation is a good expression to describe the behaviour of axial channelling particles in single crystals.
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Osamu Matsuoka
1982 Volume 51 Issue 7 Pages
2263-2266
Published: July 15, 1982
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Dirac-Fock SCF theory for the generalized average energy of configurations is formulated. Practical method for solving the SCF equations in the framework of the basis-set expansion method is presented. Calculations have yielded accurate energies of the
LS averaged ground-state configurations of neutral atoms from He to Ne.
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Kiyoshi Ueda, Masayoshi Karasawa, Kuniya Fukuda
1982 Volume 51 Issue 7 Pages
2267-2270
Published: July 15, 1982
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Oscillator strengths (
f values) for the transitions 3
s3
p 3P-3
sns 3S (
n=4 and 5), -3
snd 3D (
n=4 and 6 to 9) and −3
p2 3P in Mg I have been determined by using the hook method. The metastable 3
s3
p 3P levels have been populated by a DC discharge of the Mg–He mixture. The absolute scale is based on the absolute
f values for 3
s3
p 3P-3
s3
d 3D (∼0.62). The determined
f values are in good agreement with recent theoretical predictions. An estimate of the photoionization cross section from the
3P levels by extrapolating the
f values results in 20.2 Mb at the threshold.
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Tuto Nakamura, Tetsuro Tanaka, Yukio Izumitani
1982 Volume 51 Issue 7 Pages
2271-2279
Published: July 15, 1982
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A self-consistent treatment is given for the ion distribution near the surface of electrolyte solutions, by solving the Debye-Hueckel equation in the WKB approximation. The surface tension is calculated for electrolyte aqueous solutions with improvement of Onsager and Samaras’ result, in comparison with the experiment. Kirkwood and Buff’s method is reexamined to get a new and simple expression for the suface tension increase. The self-consistent treatment is shown to be crucial for obtaining a convergent result by means of different basic formulas.
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P. Gluck
1982 Volume 51 Issue 7 Pages
2280-2284
Published: July 15, 1982
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Within mean field theory the dependence of the order parameter on the distance from a parallel plate boundary is studied numerically for the nematicisotropic transition, for different boundary conditions and separation of plates. The latter two parameters determine the phase diagram for the different phases.
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Masao Misonou, Hirohisa Endo
1982 Volume 51 Issue 7 Pages
2285-2292
Published: July 15, 1982
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The measurements of the resonance shifts of
77Se and
125Te,
ΔH(
77Se) and
ΔH(
125Te), have been done for liquid Se–Te mixtures up to 600°C and 500 bar. A rapid increase in
ΔH(
77Se) at higher temperatures has been observed for the Se-rich mixtures, which is ascribed to the increase in the number of onefold defect states C
10. In Te-rich concentration range there appears the contribution of conduction electrons to
ΔH(
125Te), where the structure of the liquid mixtures changes from Se-like to Te-like structure. Near the structural transition region, the pressure derivative of
ΔH(
125Te) versus temperature curve shows maximum as a consequence of the collapse of chain structure. It is suggested that Te sites in the chain rather than Se sites tend to be transformed to threefold coordinated C
30 states by increasing Te concentration or by applying pressure.
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Hideaki Takabe, Kunioki Mima, Takashi Yabe
1982 Volume 51 Issue 7 Pages
2293-2299
Published: July 15, 1982
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Generation of strong electrostatic field due to hot electron penetration is studied in the transport region of a laser produced plasma. Assuming a stationary state, the system with collisionless hot electrons governed by Vlasov equation and cold electrons described by the fluid equations is treated. It is found that the generation of localized ion wave turbulence causes strong electric field in the vicinity of the critical layer through its anomalous friction on the return current, and the potential maximum is found to reach up to the magnitude comparable to the hot-electron thermal energy over a distance of a few tens microns, strongly inhibiting hot-electron heat flow.
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Kimitaka Itoh, Takashi Tuda, Shinji Tokuda, Sanae Inoue Itoh
1982 Volume 51 Issue 7 Pages
2300-2303
Published: July 15, 1982
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High-
n kinetic ballooning instability is obtained where the toroidal coupling, coupling of Alfvén and drift modes, and the correct forms of plasma dispersion functions are retained. This mode is identified as a kinetic description of MHD ballooning mode, and is unstable both in the zero-pressure limit and in the second stability region of MHD analysis. Ballooning mode is universally unstable in toroidal plasmas.
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Yasuaki Kishimoto, Tsuguhiro Watanabe, Hitoshi Hojo, Kyoji Nishikawa
1982 Volume 51 Issue 7 Pages
2304-2311
Published: July 15, 1982
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A new efficient numerical scheme is presented for analyzing the nonlinear wave propagation in nonuniform medium at high accuracy. The method consists of combining the shooting method and Newton’s iteration scheme. As an example, the structure resonance phenomena in laser-plasma interaction are studied as a nonlinear boundary problem. Multi-valued reflection coefficient as a function of the incident laser intensity and the associated anomalous transmission phenomena are studied.
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J. Choudhury (nee Ray)
1982 Volume 51 Issue 7 Pages
2312-2317
Published: July 15, 1982
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The inverse scattering method for determining the solution of the nonlinear equation
iqt+(
q|\sqrt1+|
q|
2)
xx=0
under nonvanishing boundary conditions is presented. One soliton solution as well as the infinity of conservation laws are obtained.
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Hiroaki Ono
1982 Volume 51 Issue 7 Pages
2318-2325
Published: July 15, 1982
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Nonlinear topographic Rossby waves propagating in a channel of finite width are investigated by the reductive perturbation method. When the channel is sufficiently wide and homogeneous in the outside of a wave guide, the resultant equation takes the form of that obtained by Joseph, and Kubota, Ko and Dobbs. On the other hand, in the presence of weak inhomogeneity, it is shown that a Rossby wave soliton undergoes modification such as change in phase velocity and radiation damping according to the properties of the inhomogeneity.
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