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Takahashi Yamaya, Keizo Ishii, Koji Miura, Susumu Morita
1975 Volume 38 Issue 3 Pages
601-605
Published: March 15, 1975
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Unambiguous
ln=5 assignments have been made for the 1.96–2.24 MeV doublet in
90Y from the
ln-dependence of the excitation function for the
89Y(d, p)
90Y reaction over the range E
d=3.3–4.6 MeV at θ=150°. It is concluded that these two excited states are the 5
+ and 6
+ states of the (2p
1⁄2−1, 1h
11⁄2) configuration. The present
ln assignments are found to be little affected by the ambiguity of optical model parameters.
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Mikio Hyakutake, Masaru Matoba, Takenori Tonai, Jiro Niidome, Shiro Na ...
1975 Volume 38 Issue 3 Pages
606-610
Published: March 15, 1975
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Differential cross sections for the elastic scattering of 14.1 MeV neutrons from Fe and for the inelastic scattering to the first excited state at 0.85 MeV have been measured. The inelastically scattered neutrons were completely separated from elastically scattered ones by a time-of-flight spectrometer which had an energy resolution of 260 KeV for 14.1 MeV neutrons.
The angular distributions for elastic and inelastic scattering have been analyzed by the optical model and the distorted wave Born approximation (DWBA), respectively. Both elastic and inelastic scattering have also been analyzed using the coupled channel calculations. Reasonable fits to the data were obtained. The deformation parameters extracted are compared with those found from other experiments.
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Tsuneo Morii, Hikaru Inoue, Yasukazu Yoshizawa
1975 Volume 38 Issue 3 Pages
611-615
Published: March 15, 1975
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Gamma-ray energies of the ground-state rotational levels of
166Er and
178Hf were precisely measured with Ge(Li) detectors. The observed gamma-ray energies are 80.589±0.005, 184.415±0.006, 280.450±0.008 and 365.777±0.016 keV for
166Er and 93.179±0.006, 213.434±0.006, 325.554±0.008 and 426.355±0.010 keV for
178Hf. The rotational energies were analysed by three kinds of spin-dependent expressions.
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Tsuneo Morii
1975 Volume 38 Issue 3 Pages
616-622
Published: March 15, 1975
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Low energy gamma rays following the decay of
177mLu were investigated by using a high resolution Ge(Li) detector. Level energies of the
K=7⁄2
+[404] band with spins up to 17/2
+ in
177Lu and those of the
K=9⁄2
+[624] band with spins up to 21/2
+ in
177Hf were precisely determined with an accuracy of about 10 eV. Coefficients of the Bohr and Mottelson expression including higher order terms were evaluated from these experimental level energies. This expression reproduces the experimental values with four and five parameters for
177Lu and
177Hf, respectively. It was found that the Coriolis terms are negligibly small for the
K=7⁄2
+ band and the higher order Coriolis terms are considerably large for the
K=9⁄2
+ band. The moment of inertia of the
K=7⁄2
+ band increases but that of the
K=9⁄2
+ band decreases as the angular frequency increases.
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Tetsuo Ishii, Shigeo Naya
1975 Volume 38 Issue 3 Pages
623-630
Published: March 15, 1975
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A critical behaviour of “spherical phonon system” is studied, which is a tentative model useful for the consideration of the ferroelectric phase transitions in anharmonic lattices. The mechanism of the phase transition in this system can be interpreted as a Bose-Einstein condensation of spherical phonons based upon a freeze of chemical potential. The results obtained by the classical and the quantum-mechanical treatments are compared with that of previous theories given by Lines, Tokunaga and Matsubara, Larkin and Vaks,
et al.
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Hisashi Nara, Teiji Kobayasi, Haruhiko Yamazaki
1975 Volume 38 Issue 3 Pages
631-636
Published: March 15, 1975
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Extended pseudopotential
Vp′ is defined as superposition of a pseudopotential in a usual sense, and an attractive potential which originates from orthogonalization procedure to higher-lying states. The pseudo-Hamiltonian with
Vp′ is shown to generate the same valence levels as the real Hamiltonian does, and spurious non-valence levels as well. A particular form of
Vp′ is proposed, which is obtained from the constraint that none of the non-valence levels should lie in the valence region. It is shown that, with the particular
Vp′, the core-coupled non-valence states have complex eigenvalues. The theory enables us to work with only in a restricted energy region of interest. Applications and limitations of the theory are discussed.
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Yoshiyuki Ono
1975 Volume 38 Issue 3 Pages
637-644
Published: March 15, 1975
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The magnetothermal resistivity of an antiferromagnetic insulator in which the spin system is described by the Ising model is calculated for the temperatures far below the Néel temperature by using the molecular-field approximation for the spin system. Phonons are assumed to carry the thermal energy and to be scattered by the spin fluctuations through a spin-phonon coupling for which a semi-phenomenological simple expression is used. The resistivity-field curve is obtained by a numerical calculation and shown to have a narrow spike near the critical field (meta-magnetic phase transition from the antiferro- to the paramagnetic phase) in addition to broad peaks in each of the two phases.
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Yoshiyuki Ono
1975 Volume 38 Issue 3 Pages
645-655
Published: March 15, 1975
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The magnetothermal resistivity of an insulating uniaxial Heisenberg antiferromagnet in the low-temperature region is calculated by using the spin-wave approximation for the spin system. Heat is assumed to be carried mainly by phonons which are scattered by boundaries and by spin fluctuations; the case where the latter contribution gives a small but field dependent correction to the former one is considered. The magnetic field dependence of the thermal resistivity is numerically estimated and discussed in comparison with that obtained in the molecular-field approximation and in connection with the recent experiment by Metcalfe and Rosenberg.
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Yoshinori Takahashi, Fumiaki Shibata
1975 Volume 38 Issue 3 Pages
656-668
Published: March 15, 1975
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A new method of treating problems of spin systems is developed, in which spin operators are transformed into two kinds of boson operators according to Schwinger’s method. Usual treatment of coherent state representation is generalized to spin systems with a fixed magnitude
S. Some basic properties and the relations to the atomic coherent state are investigated rather in details.
The method is applied to spin relaxation process and a corresponding Fokker-Planck type equation is obtained and solved to give a multiple relaxation process due to nonlinearities. It is shown that our formulation has several advantages over other ones in some respects.
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Kazuo Hattori
1975 Volume 38 Issue 3 Pages
669-672
Published: March 15, 1975
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The energy levels of a piezoelectric polaron bound in a Coulomb potential are calculated in two different cases. One is the case in which a piezoelectric polaron is very weakly bound in a Coulomb potential. The other is the case in which a piezoelectric polaron is strongly bound and/or the electron-phonon interaction is strong. The former case is treated by the intermediate coupling theory at finite temperature. The latter is treated by the adiabatic approximation.
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Miki Wadati
1975 Volume 38 Issue 3 Pages
673-680
Published: March 15, 1975
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A nonlinear partial differential equation which describes the wave propagation in a one-dimensional nonlinear lattice is presented and studied by various analytical methods. It is shown that the equation has periodic progressive wave, and one and two soliton solutions. It is also shown that the equation has an infinite number of conservation laws and has Bäcklund transformation. Furthermore, the application of Hirota’s method to the equation is discussed.
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Miki Wadati
1975 Volume 38 Issue 3 Pages
681-686
Published: March 15, 1975
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It is shown that a nonlinear partial differential equation
ut+6α
uux+6β
u2ux+
uxxx=0 can be solved exactly by “inverse method”. In particular, the exact
N-soliton solution is obtained which describes the collision processes among
N solitons. It is found that
N-soliton collision in the equation is essentially the same as those in the Korteweg-de Vries equation and the Modified Korteweg-de Vries equation;
N-soliton collision is described as the successive collisions of two solitons and there is no effect of multiparticle collisions.
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Eijiro Haga, Syozo Maeda
1975 Volume 38 Issue 3 Pages
687-694
Published: March 15, 1975
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For the term of electron interactions in the many band Hamiltonian, the matrix elements of all types possible for the two band case are used, taking into account the difference between the Coulomb and exchange scatterings with respect to the momentum changes, and the following things are found within RPA. For the orbital interaction, the interband contribution is enhanced in connection with only the exchange scattering. In the paramagnetic case, the intraband contribution for the quadrupole interaction is decreased. And the contributions from the core polarization and the dipole interaction are increased in the same way for each one of the intra- and inter-band contributions. For saturated ferromagnets, the screening for the dipole interaction is the same as that for the quadrupole interaction.
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Hatsuo Hayashi, Kazuyoshi Hirakawa
1975 Volume 38 Issue 3 Pages
695-700
Published: March 15, 1975
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The NMR line widths of the
F19 nuclei in the α-type KCuF
3 are measured from
TN (39.8 K) to 550 K. The widths of
F19 nuclei being on the
c-axis extend gradually and tend to saturate as temperature is raised up to 550 K and those of
F19 nuclei being on the
a-axes diverge as temperature is lowered to
TN. The latter behavior is explained by the three-dimensional behavior of the spin system. In the former case the width near
TN is explained by usual exchange narrowing, but there has been no theory which interprets the widths at high temperature. A theory based on Kubo-Tomita’s theory is proposed by assuming the one-dimensional diffusion process in the linear chain with a weak interchain exchange interaction. Theory interprets satisfactorily the experimental results.
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Kiiti Siratori, Junji Sakurai
1975 Volume 38 Issue 3 Pages
701-709
Published: March 15, 1975
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Neutron diffraction of Mn
xZn
1−xCr
2Se
4 (
x=0, 0.05 and 0.1) powder was observed at 4.2 K and 1.3 K. Diffraction pattern as a whole is unchanged and the screw spin structure is preserved in spite of the 10% substitution of Zn by Mn.
k0, the wave vector representing the screw structure, is independent of temperature but decreases with increasing
x.
Distortion of the screw spin structure due to an interstitial spin was treated by perturbation. Comparison of the results and the experimental data shows that the change of Cr–Cr exchange interaction due to Mn substitution cannot be ignored compared with Mn–Cr exchange. Several conditions on the Mn–Cr interaction was obtained.
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Yoshikazu Nishihara
1975 Volume 38 Issue 3 Pages
710-717
Published: March 15, 1975
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Mössbauer experiment has been performed in TbFe
1−xCr
xO
3. Hyperfine field at
57Fe nuclei is 550 kOe at 0 K for
x=0, and it decreases by 9 kOe when one Fe
3+ ion is replaced by a Cr
3+ ion at the nearest neighbor site of
57Fe
3+ ion. This decrease is attributed to the change in the supertransferred hyperfine interaction caused by the replacement. Temperature dependence of the hyperfine field is explained by a modified molecular field theory for various concentrations. In the Cr
3+ concentration higher than
x=0.8, anomalous increase is observed in the hyperfine field. The anomaly arises from the concentration dependence of the zero-point spin reduction at
57Fe. The positive superexchange coupling of Fe
3+–O–Cr
3+ gives a reasonable explanation on the magnitude of the anomaly.
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Shigeru Takayanagi, Tadashi Sugawara
1975 Volume 38 Issue 3 Pages
718-725
Published: March 15, 1975
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The existing experimental results on the effect of transition metal impurities on superconductivity in several alloy systems were compared with theories based on two different models, the Anderson model and the s-d model. It was found that the theory of Müller-Hartmann and Zittartz (s-d model) reproduces the experimental results in Kondo alloys with
TK⁄
Tco\lesssim1 fairly well if
TK of the theory is replaced by
TK⁄10, where
TK is the Kondo temperature of alloy and
Tco is the critical temperature of host metal. It was also found that the thermodynamic quantities at
T=0 of Kondo alloys fit the theory of Shiba (Anderson model) remarkably well. From the observed variation of the position of the localized excited states with in the gap with
TK⁄
Tco, it was inferred that the transition from the pair breaking behavior to the nonmagnetic BCS behavior takes place rather abruptly at about
TK⁄
Tco≈80.
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Kazuaki Miyamoto, Takeo Nagamiya
1975 Volume 38 Issue 3 Pages
726-730
Published: March 15, 1975
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The phase transition between the high density fcc phase, α, and the low density fcc phase, γ, of the Ce metal is discussed by introducing an explicit volume dependence of the Helmholz free energy in the Ramirez-Falicov model. It is shown that the phase boundary curve in the
p,
T-plane and the critical pressure and temperature,
pc and
Tc are quantitatively in agreement with those observed for an appropriate choice of the parameters involved. Discussion is given for these parameters.
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Tadaoki Mitani, Masayuki Ishibashi, Takao Koda
1975 Volume 38 Issue 3 Pages
731-738
Published: March 15, 1975
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Optical properties are studied for EuS films fabricated by different conditions. Films formed on a cleavage surface of NaCl are found to be of an epitaxial ordering and have sufficiently good optical quality so that are suitable for detailed magneto-optical study. The characteristic features of the magnetic circular and linear absorption spectra observed in such films are in good agreement with the recent theoretical results by Sakai
et al. on the basis of the magnetic exciton model proposed by Yanase and Kasuya. The wavelength modulation method applied to the magneto-absorption measurements provides further information on the multiplet structures of the spectra.
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Hiroshi Sato
1975 Volume 38 Issue 3 Pages
739-741
Published: March 15, 1975
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The relative stability of a long period superlattice over the ordinary superlattice (or a long period superlattice with infinite period) decreases as the period
M becomes larger and vice versa. The pressure dependence of the phase relations of superstructures of a Cu—51 a/o Au alloy observed by H. Iwasaki and co-workers is compared with related observations dealing with the relative stability of these two types of superlattices in the light of the above relation.
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Katsumasa Fujii, Eizo Otsuka
1975 Volume 38 Issue 3 Pages
742-749
Published: March 15, 1975
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Far-infrared magnetoplasma absorption due to electron-hole drops in pure germanium is observed in a transmission measurement for the wavelength 337μm (HCN laser) and 119μm (H
2O laser). Analysis is made in terms of Mie’s light scattering theory, yielding the density of electron-hole pairs, the relaxation time in the drop and a strong frequency dependence of the latter. The values obtained from Mie’s scattering theory are
nd∼9×10
16 cm
−3 near 39 kOe, 1⁄τ∼5×10
11 and 6×10
11 sec
−1 for 337μm at 1.9 and 4.2 K, respectively, and 10
12∼10
13 sec
−1 for 119μm between 1.9 and 4.2 K.
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Hiroyasu Shimizu, Yoshikazu Ohbayashi, Keiichi Yamamoto, Kenji Abe
1975 Volume 38 Issue 3 Pages
750-754
Published: March 15, 1975
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An influence of cation ordering on vibrational spectra in spinel-type CdIn
2S
4 has been studied from the infrared reflectivity measurements below and above
Tc (130°C). Very little ordering effect is thought to be originated from the equivalency of Cd and In atoms on tetrahedral sites. The Raman spectra have been measured, and analyzed on the basis of the symmetry of O
h7 without a consideration of the effect of cation ordering. The fundamental frequencies were determined as follows;
A1g=366 cm
−1 Eg=185 cm
−1 and
T2g=312, 247 and 93 cm
−1 at room temperature.
The analysis of force constant has been performed for CdIn
2S
4 and other indium thiospinels by using the model proposed by Brüesch and D’Ambrogio. The ion distribution in CdIn
2S
4 is discussed from these results.
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Kenjiro Watanabe, Hidetaro Abe
1975 Volume 38 Issue 3 Pages
755-765
Published: March 15, 1975
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Centre I of Cu
2+ in NH
4Cl single crystals has been studied at 9 and 35 GHz in a temperature range from 4.2 to 420 K. The centre gives a rhombic spectrum at 4.2 K explainable by a |3
z2−
r2> function with 20% admixture of |
x2−
y2> and a tetragonal one above 60 K, both of which disappear at 160 K. Another tetragonal spectrum appears above 330 K, though the lines corresponding to
H⁄⁄
z can be observed independent of temperature. The model presented for the centre is a Cu
2+ ion placed at the face-centre of four Cl
− ions which make a rhomb at 4.2 K and associated with a vacancy at one of two adjoining NH
4+ sites. The motion of ligands, four Cl
− ions and one NH
4+, is used to explain the temperature dependent spectra, including a disappearance of Cl shfs around 16 K, and their abrupt change at the lambda temperature of NH
4Cl.
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Seiichi Hasegawa, Tatsuo Shimizu
1975 Volume 38 Issue 3 Pages
766-773
Published: March 15, 1975
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The behaviors on isothermal annealing of paramagnetic centers produced by P
+ ion implantation into Si (ion energies: 50 and 100 keV; ion doses: 1×10
15 and 2×10
14 cm
−2) and those obtained for Si surface are investigated by ESR measurements. A new method different from the conventional Bemski method is used to obtain the activation energy (
ΔE) for annealing out of the ESR centers with the following results; (1) in case of the presence of several kinds of defects with different time constants,
ΔE obtained by Bemski method is the average value of
ΔE’s obtained by the present method, and (2) the defects with
ΔE of 0.6 eV observed in lightly damaged samples and those with
ΔE of 0.45∼0.5 eV observed in heavily damaged samples are suggested to be Si-P3 and Si-B2 centers, respectively. Similar experiments are carried out on the electrical activation of the implanted P atoms. Possible processes for the activation are discussed in comparison with the results for the defects.
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Takuchi Anzai, Takenari Goto, Masayasu Ueta
1975 Volume 38 Issue 3 Pages
774-779
Published: March 15, 1975
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Zeeman effect is studied for a narrow absorption line at 390.89 nm in CuCl crystal induced by a nitrogen laser excitation, the appearance of which was reported previously as a possible evidence for the Bose condensation of excitons. From the Zeeman splitting, it is concluded that this absorption corresponds to the formation of an exciton bound to a transiently generated neutral donor.
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Michel Rosso
1975 Volume 38 Issue 3 Pages
780-785
Published: March 15, 1975
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We present a new model to interpret the asymmetry of the Electron Spin Resonance spectrum observed at low temperature and high microwave frequency, in phosphorus doped silicon in the concentration region 2×10
17cm
−3 to 10
18cm
−3. This model is based upon the distinction between isolated and strongly coupled donors. The exchange energy that determines this separation is one order of magnitude larger than the hyperfine interaction between the electron and the nucleus of the donor. Strongly coupled donors constitute clusters: Interactions between these clusters and isolated donors are of the same order of magnitude or smaller than the hyperfine coupling, and cause the spectrum to be asymmetric when the electronic polarization is large. We are able to perform a complete Monte Carlo calculation of the donors distribution and to determine the resulting spectrum for a concentration 2×10
17cm
−3: The result is in good agreement with the experimental curve.
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Makoto San’ya, Chihiro Hamaguchi
1975 Volume 38 Issue 3 Pages
786-790
Published: March 15, 1975
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The Brillouin scattering intensity has been investigated using slow transverse acoustic (T2 mode) waves amplified through acoustoelectric effect in CdS. The experiments have been performed under the two scattering configurations; the incident light polarizations are parallel and perpendicular to the
c-axis. The Brillouin scattering cross sections are also derived including the indirect photoelastic effect due to piezoelectrically induced electro-optic effect. The measured scattering intensities are found to agree with the theoretical analysis when the boundary effect of the sample is taken into account.
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Yozo Kaifu, Teruo Komatsu, Yukio Takemura
1975 Volume 38 Issue 3 Pages
791-796
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The absorption spectra of bound excitons in GaP:N and GaP:S crystals have been investigated between 10 and 250 K. Thermal broadening of the no-phonon
A- and
C-lines is examined on the basis of a two phonon Raman process model. Above 50 K the temperature dependent width of the
C-line can be fitted reasonably well with the model using the phonon distribution curve of GaP. The width of the
A-line can also be fitted with the same model but the fitting deviates somewhat at higher temperatures. Below 50 K the principal contributions to the width are attributable to crystal inhomogeneities.
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Toshio Fukushima, Shigeo Shionoya
1975 Volume 38 Issue 3 Pages
797-803
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Capture processes of excitons and free carriers by shallow donor-acceptor pairs in CdS are investigated by observing the characteristics of the edge emission produced by such pairs. Using CdS
0.995Se
0.005:Li crystals, the observation is made at 4.2 K by two types of excitation, one with the 488.0 nm laser light corresponding to the direct creation of A excitons and the other with the 476.5 nm laser light corresponding to the free carrier generation. There are clear differences between the two types of excitation in peak shifts with excitation intensity and during decay, and further in the manners of decay. It is concluded that excitons cannot be captured by pairs with intrapair separations larger than 2.8 times the exciton Bohr radius, while free carriers are captured by any pairs with separations larger than 1.3 times the donor electron Bohr radius.
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Hideo Takezoe, Ryumyo Onaka
1975 Volume 38 Issue 3 Pages
804-809
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The relaxed excited states of the paired Ag
− ion center in KCl crystal have been studied by measuring the polarization correlation and the decay time of luminescence. The luminescence of the paired Ag
− center consists of a single emission band and shows a noticiable polarization correlation with the excitation band. The degree of polarization is almost constant in the region above 7 K, but changes steeply below 5 K. From analysis of the changes, it is concluded that the emission takes place at the higher temperatures from the nearly degenerate two states in
3Σ
u+ whose energy splitting being about 0.19 meV. Below 5 K, the luminescence takes place preferencially from the lower state of the nearly degenerate states. Furthermore, it is found from the temperature dependence of the decay time of luminescence that the remaining lowest state in
3Σ
u+ participates in the luminescence process as a trapping state.
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Hideo Takezoe, Ryumyo Onaka
1975 Volume 38 Issue 3 Pages
810-816
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The emission process and the relaxed excited states have been studied for the 520 nm emission band of the paired Au
− ion center in KCl crystal. The emission band shows characteristic polarization correlation with the excitation band. The degree of polarization changes violently near 10 K in a complex way. The peak energy of the emission band also shifts at the same temperature showing a strong connection with the polarization change; the emission band shifts to higher energy with decreasing temperature above 10 K, but to lower energy below 10 K. The decay time of luminescence becomes longer with decreasing temperature and reaches to a constant value at about 8 K, implying the existence of a trapping state slightly below the emission state. The structure of the relaxed excited states connected with the 520 nm emission is discussed from these experimental results.
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Satoshi Nanamatsu, Masakazu Kimura, Tsutomu Kawamura
1975 Volume 38 Issue 3 Pages
817-824
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Single crystals of Sr
2Ta
2O
7 and Sr
2Nb
2O
7 are grown by a floating zone technique. Strontium tantalate belongs to
D2h14 or
D2h17 space group at room temperature. Ferroelectric phase transition temperature is −107°C. The Curie-Weiss temperature θ
0 and the Curie constant
CP are: θ
0=161 K(=−112°C) and
CP=0.84×10
5 K. Spontaneous polarization and coercive field are 1.9 μC/cm
2 and 0.4 kV/cm at −190°C, respectively. Strontium niobate belongs to
C2v12 space group at room temperature. Its ferroelectric phase transition occurs at
Tc=1342±2°C, with θ
0=
Tc and
CP=1.2×10
5 K, and second phase transition occurs at −156°C. Solid solution Sr
2(Ta
1−x·Nb
x)
2O
7 exists in the entire composition range and its ferroelectric phase transition temperature increases markedly from −107°C to 1342°C, according to the increase of
x. Phase transition temperatures of other solid solutions, partially replacing Sr by Ca, Pb or Ba, are also studied on ceramic samples.
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Hitoshi Sumi
1975 Volume 38 Issue 3 Pages
825-835
Published: March 15, 1975
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Absorption and emission spectra of excitons interacting with optical or intramolecular vibrations are calculated with the dynamical coherent-potential approximation proposed previously. Investigations are made for various situations to which limiting concepts of nearly-free, self-trapped and vibronic excitons are not applicable straightforwardly. An interpretation is proposed that the absorption structure of alkali halides around the exciton peak originates from a situation where the self-trapped state is energetically close to the lowest edge of the nearly-free state. In this case, where the exciton-phonon and the excitation-transfer interactions are comparable to each other and strong, configuration mixing between the two types of states is small. When the two types of interaction are weak and comparable to each other, an intermediate state between the nearly-free and the vibronic-exciton states is realized. This situation explains the progressional structure in the exciton absorption band of crystalline anthracene which is considerably different from that in the monomer absorption band.
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Kiyoyasu Imai
1975 Volume 38 Issue 3 Pages
836-841
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The temperature change
ΔT of TGS single crystals induced by the adiabatic application of uniaxial pressures
X1,
X2 and
X3 was measured in the temperature region 10°C to 70°C. The temperature dependence of
ΔT agrees fairly well with those calculated by the thermodynamic theory. The temperature and pressure dependences of the anomalous part of
ΔT which appeared below
Tc can be explained as an effect of the electroelastic coupling by the phenomenological theory.
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Kazutoshi Ohashi, Yoshiko Ohashi, Mitsuru Awano
1975 Volume 38 Issue 3 Pages
842-847
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The analytical expressions for the phonon frequency shifts and widths due to the presence of many substitutional impurity atoms in a crystal are obtained. A nearest-neighbor perturbation model including the changes in the mass and the changes in the force-constant has been employed. Furthermore, the effect of impurity concentration on the phonon resonance is considered to obtain the shifts and widths of the phonon frequency. It is carried out to investigate quantitatively the dependence of these physical quantities upon force-constant changes and impurity concentrations. The theoretical results are compared with the inelastic neutron-scattering experiments.
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Noriaki Matsunami
1975 Volume 38 Issue 3 Pages
848-854
Published: March 15, 1975
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The diffusion equation is applied to obtain the particle distribution in the transverse energy for channels containing lattice defects and the dechanneling caused by lattice defects is calculated. It is found that the particle distribution is considerably modified by lattice defects and that this modification of distribution enhances the dechanneling through electronic and nuclear collisions. The results obtained with the present method (referred as diffusion model) are compared with those obtained with the various other models, such as single, plural and multiple scattering models. It is shown that the single scattering and multiple scattering models account for the result of the diffusion model only for small and large surface concentration of defects, respectively. And then, it is concluded that the diffusion model is the most appropriate method in the intermediate region.
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Susumu Asada, Chikatoshi Satoko, Satoru Sugano
1975 Volume 38 Issue 3 Pages
855-865
Published: March 15, 1975
Released on J-STAGE: June 01, 2007
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Energies of the terms arising from electron configuration
n′
p5nd8 in a cubic field and being reached by the transitions of X-ray
p-photoelectron emission and
K-emission in nickel compounds are calculated on the basis of the ligand field theory in the strong field scheme. The spin-orbit interaction is taken into account for
p-electrons but not for
d-electrons. Intensities of these transitions are also calculated. It is shown that fairly good agreements with the experimental 3
p-photoelectron and
Kα- and
Kβ-emission spectra of some nickel compounds are obtained if one assumes the cubic field strength of about 2 eV and approximately 50% reduction of the
p-
d interaction of a free Ni
2+ ion.
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Sylvia L. Mair, Z. Barnea
1975 Volume 38 Issue 3 Pages
866-869
Published: March 15, 1975
Released on J-STAGE: June 01, 2007
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Accurate X-ray diffraction intensity data have been collected from a single crystal of germanium. The data, obtained at 294 K, were analyzed using a model which includes anharmonic thermal vibration of the atoms. Least-squares refinement gave a Debye parameter
B=0.543(±0.006) Å
2 and a cubic anharmonicity parameter β=1.8(±0.6)×10
−12 erg Å
−3. These results are compared with similar measurements for silicon and for fluorite compounds, and give an indication of the relative strengths of the tetrahedral bonds in these structures.
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Gen Inoue, Soji Tsuchiya
1975 Volume 38 Issue 3 Pages
870-875
Published: March 15, 1975
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The laser-induced fluorescence of CO
2(00
01) has been measured after the pulsed excitation of CO
2 by the HBr chemical laser line of P(6) (
v′=2→
v″=1) which is nearly resonant to the R(20) line of 00
00→00
01 transition. The deactivation rate of CO
2(00
01) in rare gases of He, Ne and Ar decreases as the temperature is lowered, while its temperature dependence becomes smaller at lower temperatures. In contrast to this, the deactivation rate in CO
2 shows a minimum in the vicinity of 300 K and a negative temperature dependence below 300 K. The former result would be expected supposing that the role of the attractive part of interaction potential increases as the relative kinetic energy of the collision is reduced. Taking this effect into account, however, the latter finding is difficult to be explained by a simple extension of the former collision theory.
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Yohinobu Kawai, Yoshiharu Nakamura, Tomizo Itoh, Tamio Hara, Takaya Ka ...
1975 Volume 38 Issue 3 Pages
876-881
Published: March 15, 1975
Released on J-STAGE: May 29, 2007
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The dispersion relation of electron waves in a non-Maxwellian plasma has been investigated experimentally. It is observed that the dispersion relation of the Landau mode is modified and that a new wave mode with the dispersion relation ω⁄
k\simeq(1⁄2)
Vc (
Vc: truncated velocity) is observed for frequencies less than the electron Langmuir frequency. Those experimental results are compared with a simple theoretical model.
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Kanefusa Gotoh
1975 Volume 38 Issue 3 Pages
882-888
Published: March 15, 1975
Released on J-STAGE: June 01, 2007
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Effects of the modulation of a frequency smaller than ε is investigated, where ε is a small parameter corresponding to an amplitude of the oscillatory component of velocity distribution. Disturbance is expanded by a system of eigenfunctions in the linear stability theory of a mean flow. The mean flow is assumed to be in a critical state.
An equation which governs an evolution of the fundamental mode of disturbance is derived by taking non-linear contributions of the disturbance into consideration. The equation is solved exactly in the lowest order approximation of ε-expansion. Damping of the disturbance takes the form of an inverse proportion to time. A solution of the second order approximation discloses that the stabilizing effect of the modulation is most effective at a frequency of
O(ε).
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Satoru Ozawa
1975 Volume 38 Issue 3 Pages
889-895
Published: March 15, 1975
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A simple iterative scheme making use of the local relaxation parameter is developed which allows the numerical computation of the Navier-Stokes equations at high Reynolds number by finite-difference methods; the second and fourth-order centered-difference approximations to the convective terms are used. The vortex structure in a square cavity is examined for Reynolds numbers 400, 700 and 1000. The effect on the vortex structure of the accuracy of the finite-difference approximation to the convective terms is also investigated. It is found that the accuracy of the convective terms plays an important role in determining the size of the invicid core, and the values of the stream function and the vorticity at the vortex center.
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Yukio Osaka
1975 Volume 38 Issue 3 Pages
896
Published: March 15, 1975
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Masaru Kanashiro, Masakazu Nishi, Nobuhiko Kunitomi, Hiroshi Sakai
1975 Volume 38 Issue 3 Pages
897
Published: March 15, 1975
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Masayuki Ido, Ryosuke Hoshino
1975 Volume 38 Issue 3 Pages
898
Published: March 15, 1975
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Yasuji Kashiwase, Isao Nishida, Yoshiro Kainuma, Kazuo Kimoto
1975 Volume 38 Issue 3 Pages
899
Published: March 15, 1975
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Shinya Hashimoto
1975 Volume 38 Issue 3 Pages
900
Published: March 15, 1975
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Kiichiro Kagawa, Toshizo Nakaya
1975 Volume 38 Issue 3 Pages
901
Published: March 15, 1975
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Kazuko Kubo
1975 Volume 38 Issue 3 Pages
902
Published: March 15, 1975
Released on J-STAGE: May 29, 2007
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Naotaro Nakata, Nobukata Nagasawa, Yoshiko Doi, Masayasu Ueta
1975 Volume 38 Issue 3 Pages
903
Published: March 15, 1975
Released on J-STAGE: May 29, 2007
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