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Seigo Kato, Hiroaki Ueno, Hiroshi Taneichi, Yoshiyuki Yamanobe, Yoshio ...
1981 Volume 50 Issue 5 Pages
1407-1408
Published: May 15, 1981
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The lowest T=2 state in
24Al was observed through the
27Al(
3He,
6He)
24Al reaction. The mass excess (5.919±0.010 MeV) of the state supports the quadratic form of the isobaric multiplet mass equation.
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Hideoki Kadomatsu, Toshihiko Tokunaga, Hiroshi Fujiwara
1981 Volume 50 Issue 5 Pages
1409-1410
Published: May 15, 1981
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The magnetocrystalline anisotropy energy and magnetoresistance anisotropy of Ni–Rh alloys containing 0∼33 at% Rh have been studied in the temperature range from 4.2 K to 300 K. The anisotropy energy at 4.2 K varies drastically accompaning a change in sign at about 3 at% Rh and shows a maximum at about 6 at% Rh. The magnetoresistance anisotropy at 4.2 K has the small value, and a change in sign around the same Rh concentration as the magnetocrystalline anisotropy at 4.2 K.
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Toshihiko Tokunaga, Masatoshi Kohri, Hideoki Kadomatsu, Hiroshi Fujiwa ...
1981 Volume 50 Issue 5 Pages
1411-1412
Published: May 15, 1981
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Magnetostriction constants
h1 and
h2 of Pd–Co alloys containing 5∼60 at% Co have been measured in the temperature range between 77 K and 300 K. The values of
h1 and
h2 at 0 K determined by the extrapolation increase in magnitude with increasing Co concentration, and reach the maxima of about −3.1×10
−4 and −2.9×10
−4 at about 15 at% Co, respectively. With further increase of Co,
h1 decreases rapidly in magnitude and becomes positive above about 40 at% Co, while
h2 decreases gradually without change in sign.
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Hiroyuki Mashiyama, Sigetosi Tanisaki
1981 Volume 50 Issue 5 Pages
1413-1414
Published: May 15, 1981
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By means of X-ray diffraction study, an incommensurate phase of {N(CH
3)
4}
2MnCl
4 was found in the temperature range of 19.1∼18.5°C. Incommensurate satellite reflections were observed at (
h 0
l±ζ) with ζ\simeq0.483. In the temperature range of 18.5∼−6.5°C, the value of ζ is (
Remark: Graphics omitted.) (commensurate). This phase is ferroelastic and monoclinic with the unique axis parallel to the
a-axis. Below −6.5°C, another monoclinic phase (
P112
1⁄
n) with (
Remark: Graphics omitted.) appears.
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Hiroyuki Mashiyama, Sigetosi Tanisaki, Kazuo Gesi
1981 Volume 50 Issue 5 Pages
1415-1416
Published: May 15, 1981
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Incommensurate-commensurate transition in {N(CD
3)
4}
2ZnCl
4 has been studied by simultaneous measurements of X-ray scattering and dielectric constant. The incommensurate satellite reflections are found at (
h 0
l±ζ) with ζ=0.423 at room temperature. The dielectric constant along the
a-axis drops discontinuously at 8.8°C on cooling, and ζ changes to 0.429. Below 1.8°C, the value of ζ locks into the commensurate value of (
Remark: Graphics omitted.). A monoclinic phase is found under an external stress between the incommensurate and the commensurate phases. This new phase takes a commensurate structure with (
Remark: Graphics omitted.). Some part of the crystal does not show the anomaly observed at 8.8°C in other sample.
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Seishi Yamamoto, Yasuhiro Shinnaka
1981 Volume 50 Issue 5 Pages
1417-1418
Published: May 15, 1981
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The orthorhombic phase (
D2h25) of NaCN has the distorted structure (monoclinic cell with
a=
c, β≠90°) of the higher temperature phase (NaCl-type cubic). The temperature dependences of lattice constants
a,
b and β are measured by X-ray diffraction method. Anomalous behaviors of thermal expansions of
a,
b as well as β are observed toward the orthorhombic-cubic transition of first order. The unit cell volume, however, does not exhibit anomalous expansion.
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Masahiko Kawamura, Hiromichi Ezumi, Noriaki Gohda
1981 Volume 50 Issue 5 Pages
1419-1420
Published: May 15, 1981
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Electron and atom number densities of partially ionized krypton behind the reflected shock waves were measured by using a two-wavelength Mach-Zehnder interferometer. Measurements were carried out for flows with an initial pressure
p1=1.5 Torr and incident shock Mach numbers
Ms∼12. Electron and atom number densities in equilibrium were measured to be (2.00±0.09)×10
17 cm
−3 and (9.5±0.7)×10
17 cm
−3 respectively. These values are in good agreement with those given by theory.
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Yosinori Yamamoto, Éi Iti Takizawa
1981 Volume 50 Issue 5 Pages
1421-1422
Published: May 15, 1981
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The non-linear fifth order differential equations:
ut+(105⁄16)α
2·
uux−
uxxxxx=0,
and
vt+(105⁄16)γ
2·
vvx+(13⁄4)δ·
vxxx−
vxxxxx=0,
have solutions:
(
Remark: Graphics omitted.),
and
(
Remark: Graphics omitted.),
respectively. Here cn (
z,
k) is the Jacobi cn-function of modulus
k, with ξ=
x−(21αβ
t⁄8), η=
x−(9δ
2t⁄4), positive constants α, β, γ, and δ; and any constants ξ
0 and η
0.
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Junkichi Satsuma
1981 Volume 50 Issue 5 Pages
1423-1424
Published: May 15, 1981
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A nonlinear diffusion equation with a singular integral term is solved exactly. As special examples of solutions, a stationary solution and a solution describing a concentration of two stationary pulses are given. The latter solution exhibits a blowing up depending on the initial conditions.
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Hideki Sabata
1981 Volume 50 Issue 5 Pages
1425-1426
Published: May 15, 1981
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Introducing motions with variable inclinations on the torus, we intend to treat random walks as stochastic-type motions on the torus. Compared with the probability density for sojourn time of the classical harmonic oscillator, the limiting density for random walks becomes also uniform on the torus if we define new variables. The famous aresine law can be interpreted in terms of new variables and its paradoxical feature disappears. This fact suggests that we can interprete other seemingly curious phenomena in the probability theory in terms of dynamical system.
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Masaki Hayashi, Saburo Homma, Kazuo Katsuura
1981 Volume 50 Issue 5 Pages
1427-1431
Published: May 15, 1981
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Using the QCD perturbation theory up to
O(α
s) and the standard Weinberg-Salam model we carry out numerical evaluation for the frontback asymmetry and the charge asymmetry of the leptons from the decay of the
W±- and
Z0-bosons produced in the reactions
pp, \bar
pp→
W±+anything→
l±+ν
l+anything and
pp, \bar
pp→(γ,
Z0)+anything→
l++
l−+anything. For the scale violating parton distribution we employ the Glück-Owens-Reya parametrization. We show that these asymmetries are fairly large under certain kinematical conditions.
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Shigeru Yamada
1981 Volume 50 Issue 5 Pages
1432-1439
Published: May 15, 1981
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Measurements of gamma-gamma angular correlations in
151Sm following the decay of
151Pm have been made. A dual parameter (4096 ch.×4096 ch.) coincidence method with two Ge(Li) detectors was used. Multipole mixing ratios (E2/M1) of 17 gamma rays were deduced. Among them, six mixing ratios were determined for the first time. The parity of the 663.4 keV and 773.8 keV levels was assigned to be negative. Experimental large absolute values of E2/M1 mixing ratios of δ
349.8=2.46±
0.911.43, δ
597.7=−4.30±
19.42.74, δ
636.1=−3.41±
0.320.29 and δ
669.2=−69.3±
∞58.9 agree with a calculation which takes vibrational components into account.
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Syohei Kato, Kenji Okada
1981 Volume 50 Issue 5 Pages
1440-1444
Published: May 15, 1981
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The
27Al(
3He,
d)
28Si reaction was investigated at 25.8 MeV to obtain spectroscopic factors of high spin states located at 9.702 MeV (
J=5
−,
T=0), 11.577 MeV (6
−, 0), 13.248 MeV (5
−, 1) and 14.358 MeV (6
−, 1). These states are expected to have a large particle-hole character because of stretched configuration. The measured spectroscopic factors (2
Jf+1⁄2
Ji+1)C
2S ranged from 0.3 to 0.5. The S-factors for
T=1 were nearly equal to those of the parent analogue states obtained from
27Al(
d,
p)
28Al reaction.
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Kimie Takusagawa
1981 Volume 50 Issue 5 Pages
1445-1450
Published: May 15, 1981
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The lattice vibration of a one-dimensional incommensurate lattice is investigated at finite temperature by using the dynamical matrix approach. We consider the temperature region where the short range order or a charge density wave is well developed. By a transformation of coordinates, the dynamical matrix is separated into two terms, the dominant term or which coincides with that of the state with long range order. Using the perturbation theory it is found that the spectrum of the phase mode has a finite gap. It is shown that the phason mode appearing in the dynamical structure factor has the gap and broadening.
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Tatsuyuki Kawakubo, Akihiro Yanagita, Shigeharu Kabashima
1981 Volume 50 Issue 5 Pages
1451-1456
Published: May 15, 1981
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In order to examine the effect of external noise on the electrohydrodynamic instability, we have measured the wave number spectrum of the pattern of Williams domain in nematic liquid crystals MBBA in the presence of external noise superposed to the
ac voltage. The threshold voltage for the onset of Williams domain is found to shift to higher values with increasing noise power. Its noise dependence is interpreted in terms of a theory presented by Dubois-Violette
et al.
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Masatoshi Imada
1981 Volume 50 Issue 5 Pages
1457-1464
Published: May 15, 1981
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Linear response of weakly coupled φ
4 chains is investigated. The transfer integral method can be applied when the effect of the interchain coupling is taken into account using the mean field approximation. The Fokker-Planck equation is solved with a simple decoupling approximation for the phase space distribution function. We find a central peak structure in the dynamical structure factor. The intensity of the central peak diverges at the ferroelectric transition. This corresponds to the “softening” of the response of the domain wall. These phenomena may be observed in quasi-one-dimensional system such as CsD
2PO
4.
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Shigeru Takayanagi, Kenji Terui, Kozo Satoh, Tadashi Sugawara
1981 Volume 50 Issue 5 Pages
1465-1468
Published: May 15, 1981
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Measurements have been made of the thermal conductivity and the electrical resistivity of the singlet-ground-state compounds of praseodymium, PrCu
6 and PrIn
3, at temperatures between 1.5 and 15 K. The results on PrCu
6 clearly showed the effect of crystal-field splitting of the 4f level of Pr ion. By comparing the measured thermal conductivity with theory, information of the crystal-field level scheme is obtained. In PrIn
3 the effect is negligibly small below 15 K in agreement with known level scheme.
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Fumitaka Matsubara
1981 Volume 50 Issue 5 Pages
1469-1478
Published: May 15, 1981
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Magnetic excitations in an antiferromagnetic mixture with competing spin anisotropies are studied by using a theory developed in I and II. Calculations are made of the dynamic susceptibility of K
2Fe
xMn
1−xF
4 and Co
xFe
1−xCl
22H
2O in which the oblique antiferromagnetic (OAF) phase is found in a limited range of
x, and of Co
xNi
1−xCl
26H
2O in which the OAF phase is found in the entire range of
x. It is shown that, in spite of the difference of the spin directions of two species of magnetic ions in the steady state, properties of spin waves in the OAF phase are very similar to those in an antiferromagnetic mixture in which constituent magnetic ions have a common easy axis. The energy gap is finite in the OAF phase as in the antiferromagnetic phase, and it vanishes at the phase boundary between the OAF and antiferromagnetic phases. The latter result may be used to determine the phase boundary. A comment is given on the
TN−
x curve of a mixture with competing spin anisotropies.
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Yoshio Suzuki, Kazuo Tsuru, Yoshihide Kimishima, Hidenori Kubo
1981 Volume 50 Issue 5 Pages
1479-1487
Published: May 15, 1981
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The spin structure of (C
nH
2n+1NH
3)
2CuBr
4 (
n=1, 2) is studied by Br NMR at 1.7 K. In (C
2H
5NH
3)
2CuBr
4, the magnetic space group is
Pb′
c′
a type and the moment direction inclines at an angle of 49.5° with the
c-axis. A weak ferromagnetic moment appears along to the
c-axis. The anisotropic exchange field is estimated to be 2.5 kOe. The inter-layer exchange field and the out-of-layer anisotropy field are much smaller than previously reported values. The parameters of Br nuclear spin Hamiltonian are also obtained. In (CH
3NH
3)
2CuBr
4, the moment direction inclines at 27° with the
c-axis. It is difficult to interpret the NMR results by the two-sublattice model. A model of the four-sublattice antiferromagnet is developped.
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Hironobu Ikeda, Tomoko Abe, Ichiro Hatta
1981 Volume 50 Issue 5 Pages
1488-1494
Published: May 15, 1981
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Neutron scattering and specific heat capacity measurements were made on a two-dimensional randomly mixed antiferromagnets Rb
2Co
cNi
1−cF
2. The experimental results show a sharp phase transition which has not been ever found in the random magnetic systems. This gives an answer to a long-lived question whether or not a sharp phase transition occurs in a homogeneously random magnetic system. The critical exponents α, β, ν and γ of Rb
2Co
cNi
1−cF
2 is identical with those of two-dimensional Ising model.
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Toshijiro Tanaka
1981 Volume 50 Issue 5 Pages
1495-1498
Published: May 15, 1981
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The AFMR frequency shift
Δω in a uniaxial antiferromagnet at high power is calculated within the framework of a random phase approximation. It is shown that
Δω can be expressed in terms of the number or uniform mode (
k=0) magnons and degenerate (
k≠0) magnons excited dynamically. The presence of these excited magnons results in a shift of the AFMR frequency through changes of the anisotropy and demagnetizing fields. In spherical samples the anisotropy induced shift is negative, so that the resonance condition for the low frequency AFMR branch for a fixed resonance frequency shifts towards lower fields.
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Tadamiki Hihara, Kenichi Kojima, Takahiko Kamigaichi
1981 Volume 50 Issue 5 Pages
1499-1504
Published: May 15, 1981
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The
153Eu NMR in EuSe
1−xTe
x with
x≤0.1 has been observed in the temperature range between 1.7 and 4.2 K. The results of NMR, together with those of differential magnetic susceptibilities, show that the Type II antiferromagnetic (NSNS) phase or EuSe is stabilized by substituting a small amount of Te. In the NSNS phase of EuSe
1−xTe
x the
153Eu NMR frequency extrapolated to 0 K is independent of
x and is 121.8 MHz, corresponding to a field of 262.6 kOe. The
153Eu hyperfine field transferred from six next nearest neighbors in EuSe is estimated as −(25±2) kOe, which is comparable to a value of −24 kOe in EuTe.
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Yoshiro Kakehashi
1981 Volume 50 Issue 5 Pages
1505-1512
Published: May 15, 1981
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It is shown that the decoupling approximation in functional integral method, which has been used by Hasegawa, leads to a generalized Ising model in itinerant-electron systems, and then a new theory to go beyond the single-site approximation is proposed. It is based on the Bethe approximation in Ising model. Present theory gives SRO of 0.1∼0.2 for Fe, Co and Ni at
T∼
Tc.
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Shigehumi Onodera, Yoshikazu Ishikawa, Keisuke Tajima
1981 Volume 50 Issue 5 Pages
1513-1522
Published: May 15, 1981
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Spin dynamics of a disordered Invar alloy Fe
65Ni
35, an ordered Invar alloy Fe
3Pt as well as a non Invar disordered alloy Fe
50Ni
50 have been studied by neutron scattering. It has been found that both Invar alloys show common anomalous dynamical properties. Well defined magnon groups could be detected up to the Curie temperature. The spin wave stiffness constant
D(
T) varies with temperature as
D(
T)=
D0(1−
CT5⁄2). The magnon excitations, however, could explain only about a half of the temperature variation of magnetization
M(
T) for the Invar alloys, in spite of the fact that the integrated intensity measurements of the magnon spectra suggest that no other excitations take part in
M(
T).
M(
T) of non Invar alloy could be accounted for by the magnon excitations. The magnons in the Invar alloys dampen significantly with increasing temperature as was apparent in the linewidth
Γ(
q,
T) obeying a relation
Γ(
q,
T)=(
Γ0+
aTα)
q2 with α≤1, quite different from the Heisenberg system.
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Shigeyuki Murayama, Hiroshi Nagasawa
1981 Volume 50 Issue 5 Pages
1523-1533
Published: May 15, 1981
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Different temperature dependence of the
55Mn Knight shift has been observed for each Mn atom at four inequivalent crystallographic sites in α-Mn metal. These characteristic properties are tried to understand by the phenomenological localized spin fluctuation model, where the effect of spin fluctuation is considered by the same procedure established in the Kondo problem and the exchange interaction between magnetic moments is approximated by the molecular fields, The experimental results of the Knight shift and the anomalous transport properties of α-Mn are found to be qualitatively well understood by this phenomenological model. The existence of the localized spin fluctuations in α-Mn, postulated previously by the XPS measurements, is confirmed.
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Kiyosi Motida
1981 Volume 50 Issue 5 Pages
1534-1537
Published: May 15, 1981
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For the doped Cr
+ and Fe
3+ ions in the II VI compounds, the semiempirical relation derived previously (J. Phys. Soc. Jpn.
50 (1981) 1531) is applied which gives the number of electrons transferred to the empty orbits of the doped impurity ion. The obtained results describe successfully such physical situation that the excess charges of −
e and +
e are present at the impurity sites of the Cr
+ and Fe
3+ ions respectively.
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Toshio Bandai
1981 Volume 50 Issue 5 Pages
1538-1544
Published: May 15, 1981
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Absorption spectra of the
3T
2g band in KNiF
3, KMgF
3: 1.5%Ni and K
2NiF
4 are measured at 2 K. In the antiferromagnetic KNiF
3, splitting of the
Γ3 line in the
3T
2g band is observed. Large linear dichroic spectra are obtained in the
3T
2g band of KNiF
3 under the 〈001〉 and 〈111〉 stress. This linear dichroism is induced by the movement of domain walls so as to align spins along the applied stress. The stress effect of the split
Γ3 lines is explained by the exchange interaction in the
3T
2g state. The exchange constant
J′ is determined to be 7.5 cm
−1 for spins aligned along the 〈001〉 direction, and 8.7 cm
−1 for spins aligned along the 〈111〉 direction.
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Hironobu Hyodo, Katsunori Iio, Kazukiyo Nagata
1981 Volume 50 Issue 5 Pages
1545-1550
Published: May 15, 1981
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Short range order effects on the optical birefringence were investigated in an antiferromagnetically coupled linear-chain
S=1⁄2 Heisenberg ferromagnet CsCuCl
3 in a temperature range between 6 K and 450 K. A nearly isomorphic diamagnet CsMgCl
3 was used to extract the magnetic part of birefringence in CsCuCl
3. The magnetic birefringence was found to have a broad maximum at about 32 K. The effect of the interchain interaction on the birefringence was calculated in terms of a perturbation approach. By comparing the results with the observed temperature dependence of the birefringence, the ratio of inter- to intrachain exchange integrals was obtained as −0.07.
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Kiyosi Motida
1981 Volume 50 Issue 5 Pages
1551-1554
Published: May 15, 1981
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A semiempirical relation is given between the number of electrons transferred to the empty orbits and the hyperfine constant of the doped Mn
2+ ion in various compounds, on the basis of the empirical relation between the Szigeti charge and the hyperfine constant of the doped Mn
2+ ion in the divalent metal compounds and of an assumption that the charge of the impurity ion is equalized to that of the host cation when the impurity replaced the host cation having the same valence as the impurity. The derived semiempirical relation is applied to a problem of the degree of the localization of the bound hole to the doped Mn
2+ ion in the III V semiconductors. The bound hole is shown to be almost completely localized on the Mn orbits.
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Norihiro Sugimoto, Takashi Matsuda, Ichiro Hatta
1981 Volume 50 Issue 5 Pages
1555-1559
Published: May 15, 1981
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The specific heat capacity of Pb
1−xGe
xTe has been measured by means of a.c. calorimetry method in
x ranging from 0.05 to 0.3. We found that the specific heat capacity exhibits a steplike behavior at
Tc up to
x=0.07 and additionally critical behavior becomes appreciable at
x=0.3. These trends are very similar to those in Sn
1−yGe
yTe. The anomalous specific heat above
Tc was found to fit well to logarithmic law. The jump
ΔCp is 0.92 J mol
−1K
−1 in the crystal with
x=0.05, which is comparable with the value 0.87 J mol
−1K
−1 estimated by using the Landau-type free energy expansion coefficients by Sugai
et al. The increase of
ΔCp with
Tc is well explained by assuming that
Tc is close to tricritical point.
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Daijiro Yoshioka, Hidetoshi Fukuyama
1981 Volume 50 Issue 5 Pages
1560-1569
Published: May 15, 1981
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A transition temperature to the charge density wave (CDW) state is calculated by the mean field approximation for a two-dimensional electrons in strong magnetic fields. Firstly the effect of the impurity potential is examined. The impurity scattering is treated by the self-consistent Born approximation. The critical strength of the impurity potential is obtained for the existence of the CDW state. Secondly it is shown that higher Landau levels affect the transition temperature only slightly. Thirdly the effect of valley degeneracy is considered for a two-valley system as in (100) Si MOS. The valley degeneracy is seen to be spontaneously lifted below a critical temperature
Tv and the CDW transition occurs appreciably below
Tv. The effect of screening of the Coulomb interaction is briefly discussed.
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Shin-ichiro Nagasaka
1981 Volume 50 Issue 5 Pages
1570-1578
Published: May 15, 1981
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The off-centre instability for Cu
+ impurity ions in alkali chlorides was studied using a model that the ground state with
A1g symmetry and a localized excited state with
T1u symmetry mix with each other through the odd-mode electron-lattice interaction. In addition, an absorption lineshape due to a transition from the ground state to an even-parity state was calculated. The instability and the optical properties of the Cu
+ ion revealed through earlier empirical works are explained by this model. Among possible candidates for the
T1u state, a charge-transfer excitation state between the Cu
+ and the neighbouring Cl
− is concluded to play an essential role in the optical properties and the off-centre instability.
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Takao Nanba, Keiichi Hachisu, Mikihiko Ikezawa
1981 Volume 50 Issue 5 Pages
1579-1586
Published: May 15, 1981
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Optical constants of CuCl, CuBr and CuI crystals in the far-infrared region have been determined by the Kramers-Kronig analysis of the reflection spectra at 2 K. The dielectric constants of CuCl are found to be inconsistent with the interpretation of the triplet structure by Vardeny and Brafman. The Kramers-Kronig analysis of the transmission spectra of thin films has also been tried but it has given incorrect values of the optical constants in the reststrahl region. The absorption spectra of the three cuprous halide crystals in the far-infrared region, including the side-band region as well as the reststrahl region, are shown in a summarized way.
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Hirohito Fukutani, Akio Yamada, Tsuneharu Koide, Akira Misu, Goro Kuwa ...
1981 Volume 50 Issue 5 Pages
1587-1591
Published: May 15, 1981
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Effects of a uniaxial stress along the [011] direction on the K
+ 3
p core excitons in KBr are studied with the piezoreflectance technique. From stress dichroism, it is concluded that the core excitons located at 20.1 eV and 21.6 eV are due to the intraatomic transitions from the K
+ 3
p state to the 4
s state and from the same state to the 3dγ state, respectively. Trigonal deformation potentials or these core excitons are determined and compared with that of the
Γ exciton at the absorption edge.
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Michio Midorikawa, Hidetoshi Kashida, Yoshihiro Ishibashi
1981 Volume 50 Issue 5 Pages
1592-1594
Published: May 15, 1981
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The experimental results of dilatation and the temperature-pressure phase diagrams for Pb
3(VO
4)
2 and Pb
3(PO
4)
2 crystals are presented. The pressure coefficients of transition temperatures between the trigonal and the nonpolar monoclinic phases d
T1⁄d
p and between the nonpolar and polar monoclinic phases d
T2⁄d
p for Pb
3(VO
4)
2 were −12.1 and 20.2 deg/kbar, respectively. The intermediate monoclinic phase II of Pb
3(VO
4)
2 vanishes at a triple point of 3 kbar and 65°C. The d
T1⁄d
p for Pb
3(PO
4)
2 was −9.8 deg/kbar, but no triple point was observed. The entropy change estimated for Pb
3(VO
4)
2 on the basis of obtained data suggests that the transition mechanism in this crystal is likely to be of the order-disorder type.
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Shin-ya Miyatani
1981 Volume 50 Issue 5 Pages
1595-1602
Published: May 15, 1981
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In Yokota’s diffusion theory on mixed conduction, he has considered the case of small current density and obtained a solution in the linear approximation. In the present paper we consider larger current densities and look for an improved approximation over the linear one. The obtained approximate solution for larger applied voltages shows a better agreement with the numerical solution of the non-linear diffusion equation than the linear approximation. The comparison between the experiment and the calculation is done for βCu
2S and α′Ag
2Te.
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S. Acharyya, A. K. Das, P. Acharyya, S. K. Datta, I. L. Saha
1981 Volume 50 Issue 5 Pages
1603-1607
Published: May 15, 1981
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Temperature dependence of thermal diffusion factor, α
T, of N
2–CO (1 : 1) gas mixture can be assessed from the measurement of the equilibrium steady state separation factor,
qe as a function or pressure at 350.1, 378.5 and 413.5 K by a concentric tube type hot wall thermal diffiusion column already calibrated by a gas mixture of known and reliable α
T data. Too much attention to the column geometry is, thus, avoided through the use of the existing theoretical formulations for column in calculating α
T.
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Toshihiko Dote, Masatoshi Shimada
1981 Volume 50 Issue 5 Pages
1608-1615
Published: May 15, 1981
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Steady-state behavior of a uniform swarm of positive ions has been analyzed by using transport equations. First, general transport equations for positive ions are presented and then simplified by assuming spatial uniformity. Next, the equations are applied to the case in which the electrons are absent and swarm parameters such as the drift velocity and the random energy are numerically calculated. The results are plotted and compared with already published data. Finally, dependence of the ion mobility on the electric field and the gas temperature is discussed, and some momentum transfer collision cross-sections are determined by a reversed calculation from the published mobility data.
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Yuzo Mori, Hiroshi Ohkura
1981 Volume 50 Issue 5 Pages
1616-1623
Published: May 15, 1981
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The spin relaxation of the
FA(Li) center in KCl has been explained by proposing a mechanism due to the hyperfine interaction modulated by the tunneling Li
+ ion. The electric field effects on the relaxation times, which were measured using microwave saturation and saturation recovery methods of ESR, were analyzed using theoretically derived formulae. From the analysis, the tunneling parameters of level splitting
Δ=0.2 meV, dipole moment
p=1.4 eA, a quantity α=0.5, which could measure overlapping of tunneling wavefunctions, the rms value of fluctuating magnetic fields (=3.1 Oe) and correlation time (=1.7×10
−8 sec) were determined. From theoretical comparison of the observed isotope ratio of the spin lattice relaxation time, the isotope ratio, that α(
6Li)=1.2α(
7Li), was derived when the ratio, that
Δ(
6Li)=1.4
Δ(
7Li), was adopted.
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Hiroki Nakatsuka, Jumpei Okada, Masahiro Matsuoka
1981 Volume 50 Issue 5 Pages
1624-1630
Published: May 15, 1981
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Free precession beat of two-photon induced coherence was observed by the use of delayed probe pulses in atomic rubidium vapor. The two-photon coherence was created in the superposition state of the 5S
1⁄2 and 5D
5⁄2 levels of Rb by two-photon resonant excitation with a mode-locked dye laser pulse. The origin of the beat is attributed to the hyperfine splittings of the 5S
1⁄2 ground state of both Rb
85 and Rb
87. The observed results are explained by a theory presented in this paper.
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Yutaka Kano
1981 Volume 50 Issue 5 Pages
1631-1636
Published: May 15, 1981
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Photon anti-bunching of the two-photon coherent state (TCS) is investigated under the variation of parameters. It appears that the effect of anti-bunching is less for stronger intensity of the radiation. Since two-photon laser has not been realized yet, detection or the TCS should be carried out for the radiation through matter in which as a result of interaction the TCS might be created, i.e., hybrid radiation containing the TCS. The second-order coherence of the hybrid radiation consisting of TCS and blackbody radiation is discussed. Numerical results are shown in several figures.
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Shin-ichi Hirako, Ryumyo Onaka
1981 Volume 50 Issue 5 Pages
1637-1644
Published: May 15, 1981
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The absorption and MCD spectra of Cu
2+-doped LiCl and LiBr single crystals are studied in the region 15,000∼50,000 cm
−1 mainly at LNT. Two absorption bands (28,150 cm
−1 (B) and 36,200 cm
−1 (C)) and three absorption bands (19,000 cm
−1 (B), 22,500 cm
−1 (B′) and 29,500 cm
−1 (C)) are observed at LNT in the quenched LiCl: Cu
2+ and LiBr: Cu
2+ crystals, respectively, and assigned to the charge transfer transitions in the Cu
2+-hexahalide complexes formed in the Li-halide host crystals. The observed absorption and MCD spectra are explained by taking into account the mixing of two
t1u molecular orbitals which consist of ligand halogen
pπ and
pσ orbitals.
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Shinji Muramatsu
1981 Volume 50 Issue 5 Pages
1645-1651
Published: May 15, 1981
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An optical line shape for
E→
T2 transition in tetrahedral symmetry has been calculated for the case where both the ground and the
T2 excited states are coupled to an
e vibrational mode. The effect of quadratic Jahn-Teller coupling in the ground state on vibronic fine structure is investigated. The calculated result has been compared with the GRl absorption band in diamond. The origin of a 40 meV sideband observed experimentally has been explored within the framework of the Jahn-Teller interaction following the suggestion by Davies and Foy. It has been shown that its energy position and relative intensity can be explained, if the quadratic coupling of
e-
t in the
T2 excited state is taken into account.
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Toshihiro Taguchi, Kunioki Mima, Takayasu Mochizuki
1981 Volume 50 Issue 5 Pages
1652-1659
Published: May 15, 1981
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Saturation mechanisms of free electron lasers are investigated in the Compton regime. It is found that saturation occurs due to quasi-linear energy spreading of the electron beam in the case of multi-mode excitation. Although the energy conversion efficiency remains low even if many modes are taken into account, it can be improved to more than 50% by reaccelerating the electrons with a traveling RF wave.
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Kunimi Saito, Takasi Sagawa
1981 Volume 50 Issue 5 Pages
1660-1667
Published: May 15, 1981
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The
L2,3 edges of soft X-ray emission bands of Na, Mg, and Al metals have been measured under the condition in which the self-absorption effects are negligible. The temperature dependence of the
L3 edges of Mg and Al is analyzed over the range from 70 K to 400 K. It is found that the edge spectral shape in the energy range
E-
EF>−0.2 eV are insensitive to the transition probability and the density of states effects. The peaking parameters for the Mahan-Nozières-DeDominicis theory are estimated at 0.14, 0.10, and 0.12 for Na, Mg, and Al metals, respectively. These values are smaller than those derived from the absorption edge spectra. The temperature dependent phonon broadening was found in the case of Al metal, but not in Mg metal.
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Kazuhiro Sakimoto
1981 Volume 50 Issue 5 Pages
1668-1675
Published: May 15, 1981
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Theory of collisions between ions and symmetric-top molecules is formulated. This work is to investigate the adiabatic nature of low energy ion-polar molecule collisions. When the angular momentum quantum number projected on the symmetry axis of symmetric-top molecules is not zero, the elastic collision is significantly different from that where the molecule is linear, but not so much for the inelastic collision. Some discussions about the scaling law obtained by Takayanagi and about the modified Born approximation are given.
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Akira Miyake
1981 Volume 50 Issue 5 Pages
1676-1682
Published: May 15, 1981
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Tagami’s semiflexible chain model with local contour fluctuations is reexamined on the basis of its analogy to the Brownian process, and her model is refined in two directions; one is to strengthen the restriction on statistical averages of {
r′(
s)}
2 to be unity by introducing a non-Gaussian character to the random force in the Langevin equation, and the other is to obtain three characteristic lengths instead of one persistence length by introducing anisotropy to the mobility and the random force. It is demonstrated that the Kratky-Porod wormlike chain can be extended to Miyake-Hoshino’s twisted stiff chain by the introduction of anisotropy to the random rotational vector in the stochastic equation.
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Kazuhiro Nozaki, Tosiya Taniuti
1981 Volume 50 Issue 5 Pages
1683-1688
Published: May 15, 1981
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A nonlinear surface Alfven wave is shown to propagate as a K-dV soliton in a sheared magnetic field and generates a magnetic island by a reconnection of magnetic field near the critical layer in the presence of a finite electron inertia effect.
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Isao Katanuma
1981 Volume 50 Issue 5 Pages
1689-1697
Published: May 15, 1981
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Collisionless tearing instabilities and the associated electron heat transport are investigated by using a two-and-one-half dimensional particle simulation code. It is shown that a collisionless drift tearing instability saturates at a low amplitude and turns into a nonlinear pure tearing instability. The electron internal energy profile is flattened within the magnetic island. The electron heat conductivity obtained from the heat flow across the singular surface is proportional to
W4 in the linear phase and to (d
W⁄d
t)
W2 in the nonlinear phase of the tearing instability. Here
W is the half width or the magnetic island, and we treat the case only one tearing mode is unstable in the simulation. A theoretical model to explain these results is also presented.
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Tatsuki Ogino, Heiji Sanuki, Tetsuo Kamimura, Susumu Takeda
1981 Volume 50 Issue 5 Pages
1698-1705
Published: May 15, 1981
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The nature of nonlinear evolution of the kink ballooning mode for the aspect ratio,
R⁄
a=2 and the parameter dependence on the critical β have been investigated by a three dimensional MHD simulation based on a rectangular torus model. Consequently, it turns out that ballooning modes form large convective cells concentrated in regions of unfavourable curvature of the magnetic field line for a high-β plasma. Moreover, a stable equilibrium is found with up 5% average β value by adjusting the vertical magnetic field and the diamagnetic effect.
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