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Kazukiyo Nagata, Yoshiaki Saito, Kazuhiro Nagata
1982 年 51 巻 11 号 p.
3407-3408
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Magnetic resonance study has been performed on an amorphous insulating system 8CaO·8SiO
2·3Fe
2O
3·2FeO. At room temperature a well exchange-narrowed line with g∼2 has been observed, which broadens and shifts towards lower fields with decreasing temperature. Both the linewidth and the lineshift show sharp changes of the slope of the temperature variations at about 65 K. Below this temperature the linewidth is nearly temperature-independent but the resonance position varies in rather complicated manner. The shift of the resonance in the paramagnetic phase is interpreted as an exchange shift resulting from the rapid damping of Fe
2+ spins.
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Toshio Osaka, Masaru Komukae, Yasuharu Makita
1982 年 51 巻 11 号 p.
3409-3410
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Dielectric and thermal properties of (NH
4)
2ZnBr
4 were studied. It was found that (NH
4)
2ZnBr
4 undergoes phase transitions at about −56.5°C and 166°C on warming. The crystal becomes ferroelectric below the lower transition temperature where a small stepwise anomaly in the dielectric constant along the
a axis is observed. Spontaneous polarization obtained is 0.22 μCoul/cm
2 at −140°C.
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Toshiaki Sato, Manabu Endo, Toshio Osaka, Yasuharu Makita
1982 年 51 巻 11 号 p.
3411-3412
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
The dielectric properties of (NH
4)
2ZnCl
4 near the ferroelectric transition temperature were studied. The dielectric constant along the
a axis shows a step-wise anomaly at −4.5°C and kinks at 3°C and 46°C. It was found that (NH
4)
2 ZnCl
4 in a narrow temperature range from −4.5°C to 3°C, that is, between ferroelectric and antiferroelectric phases is weak-ferroelectric. Spontaneous polarization is 0.005 μC/cm
2 at about −3°C in comparison with 0.36 μC/cm
2 at about −120°C in the ferroelectric phase.
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E. V. Krishnan
1982 年 51 巻 11 号 p.
3413-3414
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The Classical Boussinesq equation has been taken into consideration for calculating the periodic wave solutions in terms of Jacobian cosine elliptic functions. A relation between the translation speed of the periodic wave and the maximum height of pulse is established. The linear and the solitary wave limits have also been discussed.
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Akio Fukuyu
1982 年 51 巻 11 号 p.
3415-3416
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A statistical mechanical model for two dimensional homogeneous isotropic turbulence is proposed. This model is based on a hypothesis that the extremely high Reynolds number two dimensional turbulence is, at each instant, in a state of equal probability on the intersections of energy and palinstrophy planes in the phase space. An energy spectrum is obtained which shows the k
−3 dependence for large wave numbers and represents the energy equipartition state for small wave numbers.
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Yuji Ishimori
1982 年 51 巻 11 号 p.
3417-3418
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
An integrable spin model on the one-dimensional lattice is obtained from the differential-difference nonlinear Schrödinger equation by introducing the concept of gauge equivalence. The Hamiltonian for this spin model is expressed as
(
Remark: Graphics omitted.)
where the spins
Sn are classical three-dimensional unit vectors.
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M. L. Hasiza, K. Singh, H. S. Sahota
1982 年 51 巻 11 号 p.
3419-3422
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
The intensities of the gamma transitions in
160Dy have been measured precisely by a 45 cc Ge(Li) detector. Unequal quadrupole moments for the ground and gamma vibrational bands have been proposed in order to remove the inconsistencies in the values of band mixing parameter
Zγ for this doubly even deformed nucleus of
160Dy.
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Tomoji Yamada
1982 年 51 巻 11 号 p.
3423-3430
発行日: 1982/11/15
公開日: 2007/08/23
ジャーナル
認証あり
The experimental results of Gollub
et al. are analysed by taking into account the real current-voltage characteristics of tunnel diode. The characteristics is approximated by a piecewise linear function. Then, we get a satisfactory agreement with the experimental results. The system is equivalent to the coupled two limit-cycle oscillators. For an appropriate coupling strength and frequency ratio a chaotic state arises. The return maps and the power spectra are given to ascertain the existence of the chaos. For a set of parameters deduced from the experiment the phase diagram is shown.
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Tatsuzo Nagai, Hidetoshi Fukuyama
1982 年 51 巻 11 号 p.
3431-3442
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The ground-state energies in magnetic fields are calculated for the electron crystals with the bcc and fcc structures at low electronic densities. The energies are obtained as sums of the static energy and the zero-point vibration energy in the harmonic approximation. The zero-point energy of the fcc becomes lower than that of the bcc above a critical strength of magnetic field. This leads to a structural phase transition from the bcc to the fcc caused by magnetic field. The phase diagram is determined in the density-field plane.
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Hiroshi Ueyama
1982 年 51 巻 11 号 p.
3443-3448
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A generalization of the theory of fluctuations in fluids of Landau and Lifshitz is presented on the basis of the stochastic Boltzmann equation and it is applied to the light scattering from a fluid in a nonequilibrium stationary state. The density correlation function is calculated, which agrees qualitatively with that of the nonlinear theory of kinetic equation approach of Kirkpatrick and Cohen.
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Takeo Izuyama
1982 年 51 巻 11 号 p.
3449-3461
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Statistical mechanical study on the biomembrane phase transition is extended to the cell membrane, which consists of various kinds of lipids and embraces substantial amount of proteins. The modified dimer model used in our previous study is adopted. The activation energies for excited dimers are taken to be distributed “randomly” on the dimer lattice. The proteins are represented by hard blocks which inhibit any excited dimer to invade the lattice sites occupied by the proteins. This model of statistical mechanics exhibits a well-defined phase transition. The free energy, specific heat, etc., have essential singularities at the transition point.
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Kazushige Machida
1982 年 51 巻 11 号 p.
3462-3468
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The coexistence problem of ferromagnetism and superconductivity is discussed theoretically. Recent experiments on the rare earth ternary compounds ErRh
4B
4 and HoMo
6S
8 are analyzed on the basis of the sf exchange interaction model. It is shown that the ferromagnetic molecular field effect of the sf exchange interaction is crucial in explaining the data and the spatially inhomogenous superconducting state coexisting with ferromagnetism can describe adequately various aspects of the sinusoidally modulate magnetic structure observed in both compounds.
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Tomio Koyama, Akio Kotani, Saburo Takahashi, Masashi Tachiki, Hideki M ...
1982 年 51 巻 11 号 p.
3469-3474
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A magnetic structure near the surface of ferromagnetic superconductors is theoretically studied in the temperature range of the coexistence of superconductivity and magnetism. The screening effect of the exchange interaction due to the persistent current is weakened near the surface and a spontaneous magnetization bound near the surface appears at a temperature slightly higher than the phase transition temperature of the bulk periodic phase,
Tp. Below
Tp, the periodic magnetic structure is modified near the surface so as that the ferromagnetic character is emphasized.
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Minoru Takahashi
1982 年 51 巻 11 号 p.
3475-3487
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Ferromagnetism of the single band Hubbard model at
I=∞ is analyzed numerically. The lowest energies at given electron number and total spin are calculated for various finite lattices, such as 3×4 square lattice, 2×2×3 simple cubic lattice and triangular lattices. It is found that the three-site exchange is important for the strong ferromagnetism.
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Hiroyuki Shiba, Naoshi Suzuki
1982 年 51 巻 11 号 p.
3488-3496
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The dipole-dipole interaction is important in the phase transitions of RbFeCl
3-type XY-like antiferromagnets. It can realize incommensurate states, which are related to the conical-point instability first pointed out by Ishibashi and Dvorak in connection with the structural phase transition. Several consequences of the conical-point instability including the in-plane-field effect are studied by using the Landau-type free energy. A recent neutron scattering on RbFeCl
3 by Wada, Ubukoshi and Hirakawa is discussed from the viewpoint of the conical-point instability caused by the dipole-dipole interaction.
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Jun’ichiro Mizuki, Yasuo Endoh, Yoshikazu Ishikawa
1982 年 51 巻 11 号 p.
3497-3503
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The effect of pressure on the spin density wave (SDW) state in Cr rich Cr–Al, Si, Mn, Fe and Co alloys has been elucidated by neutron diffraction studies. We found that the change of the SDW wave vector Q, by applying pressure, 1⁄
Q·
ΔQ⁄
ΔP, is linearly related to the decrease of
TN with increasing pressure 1⁄
TN·
ΔTN⁄
ΔP and that all the results from the Cr–Si, Fe and Co alloys fall on a single straight line independent of their concentrations. Their magnetic phase diagrams in a temperature-pressure coordinate system can be related to the alloy phase diagram by employing an empirical rule that applying pressure corresponds to a decrease in the electron to atom ratio. The non transition metal Si impurity has been found to act as an electron donor, while the effect of Al is not interpreted by the two band nesting model.
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Kazuo Oishi, Akinari Kasai, Hiroshi Fujiwara
1982 年 51 巻 11 号 p.
3504-3507
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
The 1st magnetocrystalline anisotropy constant
K1 was determined from the torque curve of the (001) plane for Ni–Rh and –V. Measurements were carried out at normal pressure and under pressures up to 7 kbar. Measurement temperature ranged from 4.2 K to room temperature at normal pressure and pressure effect was measured only at 77 K. The results for Ni–Rh is successfully explained by the band model in which we assume the linear change in spin-orbit parameter and the monotonical change in exchange splitting with salute content. However, those for Ni–V cannot be explained with the model. This is considered due to the appearance of the virtual bound states.
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Jun’ichiro Mizuki, Yasuo Endoh
1982 年 51 巻 11 号 p.
3508-3511
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
The magnetic structures of a single crystal of Cr-0.5 at.%Ge as a function of pressure have been studied by neutron diffraction. The characteristics are quite different from those of Cr-1.4 at.%Si. Instead the magnetic phase diagram as a function of pressure resembles that of CrMn.
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Kazuhiko Yamaya, Gendo Oomi
1982 年 51 巻 11 号 p.
3512-3515
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The compressibilities of the linear-chain compound TaSe
3 was found to be anisotropic, that is, the compressibility of the
b-axis (chain axis) was very small compared with those of the
a- and
c-axis. It was found also that the compressibilities within the (
a,
c)-plane were anisotropic. From the anisotropic compressibilities, it is concluded that TaSe
3 should be considered as a two-dimensional material with large anisotropy within the layers.
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Kozo Hoshino, Masaki Goda
1982 年 51 巻 11 号 p.
3516-3520
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The band gap of disordered binary alloys due to off-diagonal disorder is investigated quantitatively in the tight-binding model. The numerical results based on the Blackman
et al. theory show that the shape of the density of states as well as the band edges are strongly affected by the repulsive effect between bands caused by the inter-band interaction. It is also shown that the effect is prominent even when the bands of component pure metals overlap.
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Kazuo Oishi, Akinari Kasai, Hiroshi Fujiwara
1982 年 51 巻 11 号 p.
3521-3525
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Pressure effects on the spontaneous magnetization at 0 K were estimated from the forced magnetostriction. The results were analysed on the basis of the itinerant electron model, which takes both d band widening and s-d transfer into account. The pressure effect dμ⁄d
p is anisotropic through the direction of the magnetization. For pure Ni, dμ⁄d
p results only from the s-d transfer. For the positive dμ⁄d
p of Ni–V alloy, an explanation was made with the virtual bound levels.
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Yosuke Kayanuma
1982 年 51 巻 11 号 p.
3526-3534
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The hot nonradiative transitions in strongly coupled electron-phonon system is studied by a three level, constant transfer model under white pulse excitation condition. It is shown, both analytically and numerically, that the transition rate as the phonon wave packet passes through the crossing point of the adiabatic potential energy curves is given by the Landau-Zener formula in the limit of strong electron-phonon coupling except the case that the crossing point coincides with the stationary point of the motion of the wave packet.
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Shuji Abe
1982 年 51 巻 11 号 p.
3535-3543
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The photostructural change in chalcogenide glasses can be understood as a change in the interband correlation of spatial potential fluctuations. A model of reaction processes for this change is proposed, including the capture and recombination of photogenerated electron-hole pairs and the transformation of potential fluctuations. By assuming appropriate forms for the reaction rates, the following results are obtained. In the stationary condition under light illumination the degree of negative interband correlation increases with increasing light intensity and decreases with increasing temperature, while in thermal equilibrium (on annealing) in the dark it increases with increasing temperature. These features are consistent with recent experiments.
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Yoshiyuki Ono
1982 年 51 巻 11 号 p.
3544-3552
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Diagramatic treatment for the density relaxation function is employed to determine the renormalized dynamical diffusion coefficient
D(ω) of two dimensional random electron system under quantizing magnetic fields; for simplicity, the case where the Fermi energy lies within the lowest Landau subband is considered. The resulting self-consistent equation shows that
D(0) does not vanish only when the real part of the retarded Green’s function at the Fermi level is zero. The quantities, such as Re
D(ω), Im
D(ω) and the localization length, are calculated numerically by changing the Fermi energy within the lowest subband. The measure of the number of extended states per unit area is zero, but extended states do exist, which does not contradict with the observation of the quantized Hall effect.
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Kensei Ehara, Kikuo Cho
1982 年 51 巻 11 号 p.
3553-3561
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Dispersion relations of L–T (
longitudinal-
transverse) mixed mode polaritons are calculated for the E
u mode phonons in calcite and the 1s A and B excitons in β-AgI. The calculations are based on a recently developed formalism that is well-suited for L–T mixed modes as well as for multi-component polaritons. From the line-shape analysis of the reflection spectra, values of the relevant parameters are determined. The role of the background dielectric tensor in the dispersion equation of L–T mixed mode polaritons is also discussed within a general theoretical framework.
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Toshirou Yagi, Yoshikazu Hidaka, Kiyoshi Miura
1982 年 51 巻 11 号 p.
3562-3568
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The ultrasonic dispersion in the incommensurate (antiferroelectric) phase of NaNO
2 has been examined by a Brillouin scattering experiment with a special emphasis on the temperature regulation near its phase transition temperatures. A slight anomaly of the frequency shift (
Δν) of the longitudinal mode was observed only in the [010] direction at the normal-incommensurate transition point
TN. The temperature dependence of
Δν in the incommensurate phase is normal in all the three principal directions [100], [010] and [001] in contrast to the ultrasonic results. An apparent dispersion in sound velocity was found in the [010] direction by comparing with the ultrasonic data. It is confirmed that the dispersion frequency lies below a hypersonic region. The anisotropy suggests a spatial character of the orientational fluctuation on NO
2 molecules in the incommensurate phase.
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Kiyoshi Deguchi, Etsuo Okaue, Eiji Nakamura
1982 年 51 巻 11 号 p.
3569-3574
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The dielectric constant along the ferroelectric
b-axis and the spontaneous polarization have been measured for CsH
2(1−x)D
2xPO
4 (
x=0∼0.98) over wide temperature ranges. The temperature dependences of the dielectric constant in the paraelectric phase are well described on the basis of the quasi-one-dimensional Ising model except in the vicinity of the Curie temperatures, 0 K≤
T−
Tc\lesssim20 K, for all the specimens with different amounts of
x. The saturated value of the spontaneous polarization increases with increasing
x. The observed results are discussed in terms of the quasi-one-dimensional model.
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Kiyoshi Deguchi, Eiji Nakamura, Etsuo Okaue, Noriari Aramaki
1982 年 51 巻 11 号 p.
3575-3582
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The complex dielectric constants along the ferroelectric
b-axis have been measured for CsH
2PO
4 and a series of partially deuterated CsH
2(1−x)D
2xPO
4 crystals in the frequency range from 1 MHz to 1 GHz. Dielectric dispersions of partially deuterated crystals as well as undeuterated one were found to be very close to the monodispersive Debye type. The relaxation times of the partially deuterated crystals at temperatures with the same distance from
Tc increase monotonically as the deuteron concentration increases, and reach the values of about 5 times as large as those of CsH
2PO
4. Contrary to the basic assumption in the Landau-Khalatnikov theory, the ratio of the relaxation time to the static dielectric constant increases as temperature approaches
Tc.
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Hideshi Fujishita, Yoichi Shiozaki, Norio Achiwa, Etsuro Sawaguchi
1982 年 51 巻 11 号 p.
3583-3591
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Crystal structure of antiferroelectric PbZrO
3 has been studied at room temperature by adopting X-ray and neutron profile analysis methods. A considerable refinement of the structure has been made on a previous model which has generally been accepted in these 20 years. In contrast to the old model which has a large spontaneous polarization, present model has no polarization at all, and the interatomic distances are reasonable magnitude. Several contradictions having been noticed between the dielectric properties and the structural nature are now completely resolved.
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Ryozo Inoue, Toshiaki Enoki, Ikuji Tsujikawa
1982 年 51 巻 11 号 p.
3592-3600
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The salt Pt
6(NH
3)
10Cl
10(HSO
4)
4 with the average valence of Pt 2.33 was prepared by means of partial oxidation of [Pt(NH
3)
4]-[PtCl
4]. The electrical conductivity σ has a maximum at about 230 K and a minimum at about 280 K which indicate two M-I transitions. The thermal analyses by a DSC show three anomalies only on heating, G at ∼150 K, A at ∼200 K and B at ∼250 K. The exothermic anomaly A succeeding to the weak anomaly G indicates that a glass transition takes place, which is supported by a.c. calorimetry. The endothermic anomaly B corresponds to a structural transition. The result by adiabatic calorimetry at low temperature is expressed as
C(
T)=δ
T+β
T3. The β value leads to the Debye temperature of 188 K and the presence of the
T-linear term also supports the glassy state. The results of X-ray powder patterns at low temperatures are given. The M–I transitions are discussed.
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Kunihiko Maezawa, Yoshitami Saito, Toshio Mizushima, Shigeru Wakabayas ...
1982 年 51 巻 11 号 p.
3601-3606
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The transverse magnetoresistance of intermetallic compounds InBi and In
2Bi have been studied at 4.2 K in magnetic fields up to 100 kOe. Shubnikov-de Haas oscillations of InBi were observed for the fields over 60 kOe. The results indicate that InBi is a compensated metal with all closed orbits. These are compared with a Fermi surface model proposed already by Schirber
et al.
In
2Bi is an uncompensated metal with an open orbit along the 〈10\bar10〉 direction. The present results are compared with the nearly free electron model which contains a multiply connected Fermi surface.
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Ikuo Tamura
1982 年 51 巻 11 号 p.
3607-3614
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Surface anisotropy effects in semi-infinite Ising ferromagnets with spin one are investigated in term of a newly developed effective field theory. It is found that the surface can not magnetize above the ordering temperature for the bulk, no matter what the value of the surface anisotropy is. This is in sharp contrast with the result of an usual molecular-field theory, which gives a surface spontaneous magnetization there if the surface anisotropy is sufficiently larger than the anisotropy in the bulk. Temperature dependences of the magnetization and the average of the square of the single-site magnetization are also calculated numerically for some typical cases.
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Hiroshi Ohkura, Katsushi Tara, Norio Akiyama, Kiyokazu Iwahana, Yuzo M ...
1982 年 51 巻 11 号 p.
3615-3622
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The magnetic nature of the relaxed excited state (RES) of
F centers and spin-flipping processes in the optical pumping cycle have been clarified by studying the magnetic circular polarization (MCP) of emission when the pumping light is modulated between right and left circular polarization at the frequency of (ω⁄2π). Paramagnetic component
Δp(ω) of MCP is found to be proportional to the spin polarization
P*(ω) in the RES with a proportionality constant
Fp. From the analysis of the dependence of
Δp(ω) at particular frequencies on the pumping photon energy
Eph,
Fp is estimated. Thus, the
Eph-dependence of the net spin-mixing parameter ε
t is determined. The values of
Fp and ε
t are found to be smaller than those determined previously. The source of discrepancy is discussed. It is suggested that the spin-mixing in the non-radiative transition process is not neglected.
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Taro Ito
1982 年 51 巻 11 号 p.
3623-3632
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Effects of nonresonant magnetic fields (RF photons) have been investigated on
23Na and
35Cl NQR in NaClO
3. Shifts and splittings of Na NQR and lengthening of
T2 of Cl NQR due to the nonresonant fields have been observed and analyzed in terms of the theory of dressed atoms. The experimental results are in good agreement with the theoretical ones.
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Yoshihiro Kamiya, Toshiaki Goto
1982 年 51 巻 11 号 p.
3633-3636
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The contrast effect of the electron microscopic image at crystal defects is characterized by two parameters; extinction distance and absorption distance. Both quantities are originally defined for the elastic scattering. Since the inelastic scattering contributes to the electron microscopic image, parameters used for the interpretation of the images are not the same as those for the elastic scattering. It is shown that the difference of absorption distance between the theoretical estimation and that used for interpretation is due to the contrast effect of the small angle inelastic scattering.
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D. P. Mahapatra, H. C. Padhi
1982 年 51 巻 11 号 p.
3637-3642
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A γ-ray Compton spectrometer using a 200 mCi
241Am source and a HPGe detector has been designed and built. The performance of the spectrometer has been compared with similar spectrometers operating in other laboratories. The effect of air scattering from different air columns was studied. It was found to have no effect on the high energy side of the profile except that the profile becomes asymmetric. The equipment was tested for its potential use in Compton profile (CP) studies by making a measurement on polycrystalline aluminium. The measured profile has a good overall agreement with existing experimental and theoretical results. It shows a much better break near the Fermi momentum and is in better agreement with
x-ray results. Our results for the Fermi momentum
qF, 0.917±0.010 a.u., determined from the experimental autocorrelation function B(r) agrees fairly well with theories.
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Hideo Suzuki, Ken Ishikawa, Toru Yoshihara
1982 年 51 巻 11 号 p.
3643-3651
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
On the protonated retinal Schiff-base (PRSB) interacting with counter point charge
e, the adiabatic potential for
cis-trans isomerization of the first singlet excited-state is calculated as a function of rotation angle θ
11−12 about C
11–C
12 bond, including the effects of the deformation in geometrical structure of the excited state after the absorption of light.
It is shown that the potential curve of this deformed excited state is barrierless and downward concave whereas that of the ground state is upward convex, and that the two curves intersect in the vicinity of θ
11−12=90°. It is also shown that, in the highly twisted conformation at θ
11−12=90°, the deformed excited state is considerably polarized with almost positive charge |
e| shifted into C
12–N
+16 fragment, so that the effect of
e on the adiabatic potential of the deformed excited state is important.
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Shinichi Katsuki, Misako Inokuchi
1982 年 51 巻 11 号 p.
3652-3659
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A new formulation of the model potential method is developed within the Hatree-Fock-Slater (HFS) scheme. For the purpose of handy applications, the numerically-generated effective potentials are fitted to Bonifacic-Huzinaga type model potentials. Taking advantage of the intrinsically local property of the potentials in HFS formalism, the parameters involved in the model potentials are optimized using the least-square criterion for analytical functional fits without requiring any reference such as orbital energies or experimental term values etc. The frozen-core approximation which is the basic underlying notion of the theory is examined. It is shown that the model potential calculation of the electron population and orbital energies for carbon monoxide almost closely reproduces the all-electron calculation.
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Toshihiko Ohno, Koichi Suzumura, Takayoshi Okuda
1982 年 51 巻 11 号 p.
3660-3665
発行日: 1982/11/15
公開日: 2007/05/29
ジャーナル
認証あり
Multi-photon ionization of excited states of He or Hg atoms in glow discharge tube by ruby laser light were detected by using the induced variation of discharge current. The probabilities of one-photon, two-photon and three-photon ionizations with an intermediate resonance were also calculated. Laser induced current variation was explained by the calculated value of multi-photon emitted electrons. It was found that two-photon resonant three-photon ionization is dominant in He and three-photon ionization in Hg in case of rather high intense laer light.
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Ken Kawasaki, Tatehito Usui, Toshiatsu Oda
1982 年 51 巻 11 号 p.
3666-3671
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Suitable line pairs of the forbidden and the allowed lines in the helium and lithium lines are proposed for measurement of fluctuating electric fields with low frequency in plasmas. The forbidden line intensity with respect to the allowed one is calculated as a function of the electric field strength by using the quasi-static theory. For the electric field of more than several kV/cm, the forbidden line intensities are detectable. The fluctuating electric fields are observed in a small linear theta pinch plasma by using the proposed method. Two line pairs of HeI (HeI 491.1 nm/HeI 396.5 nm and HeI 663.2 nm/HeI 501.6 nm) are used for the observation. Both results obtained almost agree within the experimental uncertainty. The peak intensity of the observed fluctuating field is 5 kV/cm in the early phase of the implosion of the plasma.
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Mitsunobu Sekiya, Masao Doi
1982 年 51 巻 11 号 p.
3672-3680
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
When a concentrated polymer solution is macroscopically deformed, the average shape of individual polymers is also deformed from the equilibrium form. This molecular deformation, which can be experimentally measured by neutron scattering, is discussed theoretically on the basis of the tube model. A new formulation is given for calculating the average shape of polymers in non-equilibrium state. As an example, the deformation of polymers under steady shear flow, and elongational flow is predicted.
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Rui-yan Lin, Kei-ichi Hirano, Masao Okamoto, Katsu-hiro Shimizu, Tsune ...
1982 年 51 巻 11 号 p.
3681-3688
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
A System of 1-D transport codes combined with Fokker-Planck codes has been used to simulate plasmas undergoing compression with beam injection for the ‘R-Project tokamak’. The results obtained from the combination of beam heating and compression are very encouraging. They show that by increasing the toroidal magnetic field and the plasma current simultaneously, it is possible to significantly increase the ion temperature with a very slow compression. The final ion temperature is very weakly dependent on the compression time τ
c from 0.5 sec to 1 sec for the ‘R-Project tokamak’. If the ‘R-Project tokamak’ plasma is compressed by increasing the magnetic field and plasma current simultaneously, then the beam power of 15 MW which is necessary to obtain an average ion temperature of 5 keV without compression can be reduced to 8.5 MW.
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Toshiatsu Oda, Tadashi Ohgo, Yoshihumi Ito, Ken Kawasaki
1982 年 51 巻 11 号 p.
3689-3695
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Time- and space-resolved ion temperature
Ti⁄⁄ in a theta pinch are obtained from spectroscopic measurement of the He II 468.6 nm line in the axial direction. At the maximum pinch,
Ti⁄⁄ is 500 eV,
ne=4×10
15 cm
−3 and
Te=25 eV. At times after the implosion phase,
t\gtrsim0.5 μs,
Ti⁄⁄ keeps almost constant in the radial direction until the gradient of the magnetic field profile, measured by a probe coil, becomes steepest. Radial gradient of the ion temperature is observed outside the above region. Fast thermalization of the ions is observed, compared to binary collision times. We also find fast relaxation between
Ti⁄⁄ and
Ti⊥ which is obtained from the side-on measurement. This adduces another evidence to confirm that the fast thermalization of the ions is mainly due to some collisionless mechanisms.
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Masahiko Nakamura, Teruji Cho, Shin Kubo, Takashi Shimozuma, Kouji Yam ...
1982 年 51 巻 11 号 p.
3696-3704
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
When RF power
Prf near the lower hybrid frequency is injected to a low density plasma in WT-2 tokamak, the loop voltage decreases and falls to a negative value, implying that an RF-driven current
Irf is produced. The efficient RF-current generation is obtained as
Irf⁄
Prf≈0.6 kA/kW. The associated relaxation oscillation, where voltage spikes, step-like increases in electron cyclotron emission and X-ray bursts appear, and the correlated ion cyclotron instabilities are observed. These phenomena support the production of
Irf in the toroidal plasma.
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Hiroshi Itô
1982 年 51 巻 11 号 p.
3705-3710
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The current vorticity of a plasma in the equilibrium with the magnetic field can be proved to be conserved with respect to the time when the electric resistivity is zero. This behavior of the plasma is closely related with the freezing condition of the magnetic field to the idealized plasma. In the stationary state, the total current vorticity of the confined plasma is constant and is determined by the current circulation existing on the inner surface of the coil in two-dimensional problem. By these results, it is proved that the section of a field reversal plasma should change from a circle into an ellipse to keep the total vorticity of the azimuthal diamagnetic current when the magnetic field on the axis decays by the particle diffusion. A mechanism for the axial rotation of the plasma column around the axis is also studied by the same process.
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Kunio Kuwahara, Yuko Oshima
1982 年 51 巻 11 号 p.
3711-3719
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Flow field due to thermal convection upon a ring type heat source is studied numerically and experimentally, which simulates hopefully the flow due to the devastating combustion just after the Great Kanto Earthquake. New numerical scheme was developed, which enables us to treat accurately singular or nonuniform grid system in finite-difference method. In experimental measurements, extremely low velocity and its fluctuation were detected by laser doppler velocimeter. Both results show the main flow due to the convection is strongly concentrated within the central portion above the ring where no heat is supplied at the bottom. Conspicuous unsteadiness was observed, which is considered to be the main cause of the tornado at the calamity of the Great Kanto Earthquake.
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Masayoshi Tajiri, Toshiyuki Nishitani
1982 年 51 巻 11 号 p.
3720-3723
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
The soliton solutions of a Boussinesq type equation,
utt−
uxx+(
u2)
xx+
uxxxx=0, are analysed to show that the resonant interactions of soliton exist also in one-dimensional propagation. Moreover, the two-soliton interactions of the Ka- domtsev-Petviashvili equation are discussed.
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Kazu-hiro Iino, Yoshi-Hiko Ichikawa, Miki Wadati
1982 年 51 巻 11 号 p.
3724-3728
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
Examination of the inverse scattering transformation schemes for a generalized nonlinear Schrödinger equation reveals the fact that the algorithm of Chen-Lee-Liu gives rise to the Lax-pairs for the squared eigenfunctions of the Wadati-Konno-Ichikawa scheme, which has been formulated as superposition of the Ablowitz-Kaup-Newell-Segur scheme and the Kaup-Newell scheme.
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Kyoji Yamamoto, Jun-ichiro Hara, Koji Hirose
1982 年 51 巻 11 号 p.
3729-3733
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
This paper concerns the flow of highly rarefied gas through a circular tube of finite length leading to a vacuum from a reservoir. First, the free molecular flow is considered. Then, the effect of intermolecular collisions is estimated by applying the iteration method to the B–G–K equation. The total mass flux through the tube is computed for several values of tube length. It is shown that the correction of the flux to the free molecular flow decreases with increasing tube length and becomes negative for a tube whose length is more than about eight times as large as its diameter.
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Yoshimasa Matsuno
1982 年 51 巻 11 号 p.
3734-3739
発行日: 1982/11/15
公開日: 2007/06/01
ジャーナル
認証あり
In the framework of the theory of the
linear algebraic equation the structure of the Benjamin-Ono (BO) equation, which is a
nonlinear integro-differential equation, is studied in detail. It is shown that the
N-soliton solution of the BO equation is derived from the system of linear algebraic equations.
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