Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 36, Issue 3
Displaying 1-50 of 64 articles from this issue
  • Hirokane Kawakami, Masayasu Ishihara, Nobuharu Yoshikawa, Kameo Ishii, ...
    1974 Volume 36 Issue 3 Pages 623-628
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Nuclear structure of 181Os was investigated by in-beam gamma ray spectroscopy through the excitation function and beam-gamma timing measurements. The low-lying level scheme of 181Os was proposed and the half-life of the first excited state was obtained to be 316±18 ns. The dependence of the intensity ratio of the crossover to cascade transitions on the Nilsson orbit is discussed by taking into account the cancellation of g-factor. The hindrance factor of the E1 transition between the first excited state (9⁄2+[624]) and the ground state (7⁄2−[514]) was estimated to be 3.7×102 in terms of the Nilsson estimate.
    Download PDF (560K)
  • Tadashi Kifune, Yasuo Hieda, Shinichi Kurokawa, Kenji Tsunemoto, Yoshi ...
    1974 Volume 36 Issue 3 Pages 629-633
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Fractionally charged particles (quarks) have been looked for in cosmic rays at sea level. The detection system consists of six layers of scintillation counter hodoscopes, and is directed to large zenith angles so that quarks are detected isolated from air showers due to their interactions with the thick atmospheric layer. The total acceptance of the present measurement amounts to 1.1×1010 cm2sr sec. The upper flux limit of 3×10−10 cm−2sr−1sec−1 is obtained for e⁄3 quarks at large zenith angles. From this flux limit, a lower limit of the quark mass is estimated to be about 20 GeV/c2.
    Download PDF (608K)
  • J. J. Murphy, T. J. Burch, J. I. Budnick
    1974 Volume 36 Issue 3 Pages 634-635
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    NMR investigations of Ru as an impurity in Fe, Co, and Ni hosts yield a resonance frequency ratio for the isotopes 99Ru and 101Ru, ν101⁄ν99=1.121±0.002 Interpreting this as the ratio of nuclear moments and using the best available date for μ99 gives μ101=0.698±0.024 μN.
    Download PDF (260K)
  • Sei-ichi Takase
    1974 Volume 36 Issue 3 Pages 636-640
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The two-dimensional square Ising ferromagnet with the nearest-neighbor interaction −J and the second-neighbor interaction −J′ is investigated starting from the identity ⟨si⟩=⟨tanh(ΣKijsj)⟩. The Hartree approximation is used for treating the many-spin correlation functions. The critical point thus determined has two values for J′⁄J<0, and is corrected by the study of the spontaneous magnetization and the free energy to give a reasonable function Tc(J′⁄J). Our approximation may be valid at least qualitatively as a whole.
    Download PDF (564K)
  • Yasusada Yamada, Hiroshi Takatera, David L. Huber
    1974 Volume 36 Issue 3 Pages 641-648
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The critical dynamical behavior of the pseudospin-phonon coupled system has been investigated in connection with the structural phase transition of molecular crystals. Based on Onsager’s equation of motion, explicit expressions for three correlation functions, spin-spin correlation, phonon-phonon correlation and spin-phonon correlation, are obtained. It has been shown that the characteristic of the spectra of these correlation functions shows wide variation depending on the values of two parameters: The ratio of the relaxation rate of reorientational motion of an isolated spin and the frequency of the phonon, and the ratio of the interaction parameter of direct spin-spin coupling and that of spin-phonon coupling. Especially, in ‘fast relaxation case’, the spectrum of phonon-phonon correlation shows critical softening, whereas, in ‘slow relaxation case’ the spectrum gives ‘triple peak’ structure and only the central (relaxational) mode shows critical slowing down leaving phonon side peaks unchanged.
    Download PDF (884K)
  • Yutaka Kano
    1974 Volume 36 Issue 3 Pages 649-652
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The coherent-state representation of the density operator for an ideal Bose gas in a thermal equilibrium is introduced. It is shown that a pure coherent state can be an eigenstate of the Hamiltonian of the non-interacting boson system when the symmetry breaking term is added to it. However, at the limit of the vanishing “classical field” only zero-energy states can be a coherent state. It is also proved that the pure coherent state is the lowest energy state among all the zero-momentum states. The temperature dependence of the coherent state is then discussed. The diminution of the coherent state can clearly be seen as the temperature rises from zero to the critical temperature.
    Download PDF (496K)
  • Tsuyoshi Uda, Hideki Ushio, Yasutada Uemura
    1974 Volume 36 Issue 3 Pages 653-656
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A theory of cyclotron resonance is developed for the single crystal graphite by introducing the effect of spatial dispersion. Owing to the Doppler shifts of resonance frequencies, a considerable change of the resonance line shape is predicted for a widely spreading hole resonance spectrum which makes the detection of the hole resonance possible in some experimental conditions. The structure at H=400 Oe., ω=23 GHz observed in the derivative curves of the absorption by Suematsu and Tanuma which has not yet been understood by the local theory is realized in the calculated curves and is attributed to the predicted signal of the hole resonance.
    Download PDF (516K)
  • Ken’ichi Okamoto
    1974 Volume 36 Issue 3 Pages 657-660
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Intermediate coupling theory of polaron has been applied to the problem of an electron or a hole on a spheroidal energy surface interacting with longitudinal optical phonons. The ground state energy of polaron and anisotropic effective masses are calculated. Anisotropic hole band masses of TlCl and TlBr are calculated with the aid of measured hole anisotropic polaron masses.
    Download PDF (380K)
  • Setsuo Yokoyama, Kwi Nam Pak, Wataru Kinase
    1974 Volume 36 Issue 3 Pages 661-664
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The piezoelectric coefficients d33 and d31, the free dielectric constant ε33 and the electrostrictive constants Q33 and Q31 in both ferro- and para-electric phases of BaTiO3 crystal are calculated on the basis of the point dipole model. The calculated results are shown as a function of the effective charge of the Ti ions, which corresponds to temperature. The results obtained are discussed in comparison with the experimental data.
    Download PDF (492K)
  • S. B. Raju, R. G. Mendiratta
    1974 Volume 36 Issue 3 Pages 665-668
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The room temperature Mössbauer studies in ferrous ammonium sulphate hexahydrate (FAS) diluted with different concentrations of Cu2+ ions are reported. Two nonequivalent sites for Fe2+ ions are proposed. The quadrupole splitting and isomer-shifts obtained in various spectra are qualitatively explained on the basis of Ingalls and Oosterhuis theoretical models. From the observed spectra the values of axial field splittings are found and the effective magnetic susceptibility is calculated and compared with the experimental one.
    Download PDF (580K)
  • Yosiaki Tino, Juichiro Arai
    1974 Volume 36 Issue 3 Pages 669-674
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The Fe–Ni Invar alloys under the action of non-hydrostatic stress were studied by means of the Mössbauer spectroscopy. The unidirectional tension or shearing stress induces broadening of the spectrum. According to our calculation, this behavior implies a change in the distribution of hyperfine fields in the alloy. Furthermore, the irreversible alloys with strong internal-stress caused by many transformation-cycles α\ ightleftarrowsγ were examined; a paramagnetic-like peak is developed from the ferromagnetic peaks of the α-phase alloy, whereas ferromagnetic peaks are born from the paramagnetic-like spectrum of the γ-phase alloy. There should be some distorted or intermediate structures between b.c.c. and f.c.c. lattices, to which the anomalous properties of these alloys may be attributed.
    Download PDF (656K)
  • Hidenori Kubo
    1974 Volume 36 Issue 3 Pages 675-684
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The temperature variation of magnetization in the quadratic layer ferromagnet K2CuF4 has been investigated by measuring the NMR frequency of Cu63 or out-of-layer F19 nuclei at zero and applied fields in the temperature region of 0.27≤TTc≤0.67. The results are analyzed by a two-dimensional spin wave theory. Under the external field the dipole interaction is approximated in a form of the effective field. The XY-like anisotropy of exchange interaction is taken into consideration. Good agreement between the theory and the experimental results is obtained. The XY-like anisotropy itself is not effective to the magnetization, but its contribution to the magnetization cannot be neglected when it cooperates with the external field. The parameter of the exchange interaction J within the layer is obtained to be 12.37 K. The NMR result at zero applied field is also discussed.
    Download PDF (1232K)
  • Takashi Tsuchida, Akio Hashimoto, Yoji Nakamura
    1974 Volume 36 Issue 3 Pages 685-690
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetic susceptibility and high-field magnetization have been measured for powdered samples of CexLa1−xBi. In the range of x>0.5 the Néel temperature depends linearly on the cerium concentration and it deviates downward from this linear relation for x<0.5. No antiferromagnetic ordering could be observed for x=0.35 above 2.5 K. All antiferromagnetic samples investigated here showed metamagnetic behavior. The saturation magnetization corresponding to the magnetic moment of Ce3+ decreases remarkably with decreasing Ce concentration. These characteristics were discussed on the basis of the crystal field and molecular field interactions.
    Download PDF (656K)
  • Syozo Maeda, Eijiro Haga
    1974 Volume 36 Issue 3 Pages 691-697
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    By making use of the many band Hamiltonian, the effect of the electron correlation on (1⁄T1)orb for ferromagnetic metals is investigated by solving the Green function within RPA. It is found that only the contribution from the interband transition is affected by the electron correlation. For the case of the saturated ferromagnets, it is found that the electron correlation enhances the relaxation rate by a few time, in the tight binding approximation. The numerical calculation of the enhancement factor for nickel is done making use of a simplified two band model. The results shows that the effect of the electron correlation on (1⁄T1)orb is important for a comparison with experiments.
    Download PDF (648K)
  • Takao Kino, Toshiro Endo, Shuzo Kawata
    1974 Volume 36 Issue 3 Pages 698-705
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The electrical resistivities have been measured in temperature range from 4.2 K to 300 K on both deformed and quenched aluminum, and the deviations from Matthiessen’s rule have been observed in both the resistivity of dislocations and of the faulted loops formed by quenched-in vacancies. The deviations show comparatively similar behavior as the whole, but in detail show somewhat different profile. The results were compared with data published by the other investigators. It is concluded that the origin of the deviation for the dislocation resistivity comes from the anisotropy in scattering mechanism. Furthermore the specific electrical resistivity of dislocation and stacking fault in aluminum were estimated as 1.2×10−19 ohm-cm3 and 3.7×10−13 ohm-cm2, respectively.
    Download PDF (932K)
  • Kouichi Ichikawa, Osamu Terasaki, Takasi Sagawa
    1974 Volume 36 Issue 3 Pages 706-713
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The spectra of the TiL2,3 emission, TiM2,3 emission, TiL2,3 photoelectron yield, and X-ray photoemission have been measured on titanium oxides, TiO0.8, TiO0.84, TiO0.9, TiO1.1 and TiO1.22, by the use of a grazing incidence spectrometer and an electrostatic electron energy analyzer of hemisphere type. Results are compared with the calculated density of states proposed till now with emphasis on the effect of the oxygen concentration on the electronic structure. It is shown that the major part of the 3d state in titanium oxides locates at about 5 eV above the Fermi level and has the width of about 4 eV, and this state may extend below the Fermi level.
    Download PDF (1072K)
  • Shun-ichi Kobayashi, Toshihiro Takahashi, Wataru Sasaki
    1974 Volume 36 Issue 3 Pages 714-719
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The NMR shift, line shape and spin-lattice relaxation time of superconducting fine particles of Sn and Al with the diameters less than 500 Å are measured. The results are discussed in connection with the fluctuation of order parameter and the discreteness of the electron energy levels.
    Download PDF (780K)
  • Michio Kiritani, Naoaki Yoshida, Hiroshi Takata
    1974 Volume 36 Issue 3 Pages 720-729
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Variation of the image position of the loop dislocation with the change in diffraction condition indicates that the dislocation loops formed in aluminum by electron irradiation in a high voltage electron microscope at room temperature or above may be identified to be of interstitial type. This result is confirmed by comparison of the weak and strong contrast from the stacking fault of irradiation induced loops with that of quench induced vacancy type dislocation loops. Quench induced vacancy type dislocation loops shrink and disappear by electron irradiation, and their absorption of interstitial atoms suppresses the formation of irradiation induced interstitial type loops. The upper limit of temperature for loop formation depends on irradiation intensity, and is about 160°C for 2×1019 electrons/cm2·sec at 1000 kV. Enhanced formation of interstitial loops is observed on both intrinsic and extrinsic stacking faults which suggests the existence of attractive interaction between the fault and interstitial atoms.
    Download PDF (5952K)
  • Ryuzo Oshima, Hirohisa Endo, Osamu Shimomura, Shigeru Minomura
    1974 Volume 36 Issue 3 Pages 730-738
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The pressure effect on the resistivity and the thermopower of liquid alkali metals (Cs, Rb, K, Cs–Na alloys and Cs–K alloys) has been studied up to around 30 kbar. It has been found that the pressure gives a considerable effect on the transport properties of liquid Cs, Rb and their alloys. The thermopower of liquid Cs changes remarkably with pressure. It exhibits the maximum at pressure of 16 kbar and then decreases with increasing pressure. The importance of d-band in heavy alkali metals is discussed.
    Download PDF (1112K)
  • S. C. Jain, N. D. Arora
    1974 Volume 36 Issue 3 Pages 739-742
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Photoemission of electrons from potassium metal colloids embedded in potassium bromide crystal has been studied. Within experimental error, the energy threshold for the photoemission is found to be at 1.72 eV, and is independent of the electric field so long as the field obeys Ohm’s law. This threshold gives a value 0.52 eV for electron affinity of KBr. The electron mean range or Schubweg W (the average distance an electron drifts in the electric field before it is captured) is of the order 10−6 cm2/V.
    Download PDF (476K)
  • S. N. Sen, R. Ghosh
    1974 Volume 36 Issue 3 Pages 743-746
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The radiofrequency conductivity in case of nitrobenzene, normal propyl alcohol and acetone have been measured over a wide range of temperature for frequencies ranging from 400 kHz to 6 MHz. It has been found that the r.f. conductivity increases with the rise of temperature at first slowly and then rapidly. If the values of r.f. conductivity be plotted against the inverse of coefficient of viscosity of the liquid at different temperatures the relationship is linear with different intercepts and slopes for different frequencies. Assuming the presence of free ions which contributes to conduction current and the existence of usual displacement current, a mathematical expression has been deduced for the r.f. conductivity which can satisfactorily explain the observed experimental results. From the slope of the curves, the number of free ions per unit volume has also been calculated.
    Download PDF (524K)
  • Masayoshi Yamada, Chihiro Hamaguchi, Junkichi Nakai
    1974 Volume 36 Issue 3 Pages 747-752
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Frequency spectrum and spatial distribution of the acoustic flux amplified through acoustoelectric effect in photoconductive CdS were measured by means of Brillouin-scattering techniques. The frequency spectrum is found to shift downward and also upward, resulting successively in new resonant peaks and shoulders at (1⁄2)fn, fn, (3⁄2)fn, 2fn, etc., where fn is the frequency of maximum net gain. The enhancement of growth rate of the acoustic wave is found at higher frequencies as well as at lower frequencies than fn. The experimental result seems to indicate that the nonlinear frequency-mixing effect plays an important role in the evolution of the strong-flux spctrum.
    Download PDF (812K)
  • Koichi Shindo, Takenari Goto, Takuchi Anzai
    1974 Volume 36 Issue 3 Pages 753-758
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Reliable absorption line shape of the several higher members of the yellow exciton series in Cu2O has been measured by the photoelectric method using a monochromator with a large dispersion at 1.8 K, and has been analyzed on the basis of Toyozawa’s formula. The origin of the half width is considered to come from the interband scattering of the exciton from the p state to the 1s state by the two modes of L0 phonons. The estimated ratio in the line width of the n-th member to the second member of the exciton series is in agreement with the experimental one.
    Download PDF (776K)
  • Masatoshi Matsuda
    1974 Volume 36 Issue 3 Pages 759-764
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Large transparent single crystals of NaVO3 were grown by the Czochralski method. The complex dielectric constant was measured in a frequency range between 100 Hz and 3 MHz from room temperature to 500°C. Two dielectric dispersions were found. A remarkable dispersion observed only along the c-axis obeys the formula of the Debye-type with a single relaxation time. The temperature dependence of relaxation time is summarized as τ(T)=τ0exp(EkT), where E=0.67 eV and τ0=3.0×10−12 sec, respectively. This relaxation phenomenon may be due to impurities and vacancies.
    Download PDF (1148K)
  • Takashi Matsuda, Ryuji Abe
    1974 Volume 36 Issue 3 Pages 765-769
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Dielectric and piezoelectric nonlinearities of KH2PO4 below and above the Curie temperature were precisely determined by the harmonic detection method in which the second and third harmonics of the fundamental voltage applied to the crystal were measured. In the ferroelectric region the nonlinearity was closely related to the domain wall motion. Above the Curie temperature the result showed that (∂2χ⁄∂E2)0∝(TTc)−γ with the critical exponent γ of 4.0±0.2.
    Download PDF (596K)
  • Hitoshi Sumi
    1974 Volume 36 Issue 3 Pages 770-779
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Energy spectrum of exciton polaron is studied with the dynamical CPA (coherent potential approximation), which is introduced for inelastic scattering by Einstein phonons at every lattice site. The coherent potential at energy E is determined by the potentials at energies apart from E by integral times the phonon energy. We determine applicability ranges of the concepts used in the limiting cases; (I) the nearly free exciton for weak coupling, (II) multiple bands of the vibronic excitons for small excitation transfer, and (III) the self-trapped exciton for strong coupling. An ambiguous boundary separating (II) and (III) lies about S\simeq6, with S representing the ratio of the energy gain of exciton localization to the phonon energy. The change with increasing excitation transfer for a fixed S is characterized by the sharp crossing of (III) with (I) for S\gtrsim6, while by the gradual merging of (II) into (I) for S\lesssim6.
    Download PDF (1236K)
  • Masahiro Inoue, Makoto Okazaki
    1974 Volume 36 Issue 3 Pages 780-785
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Energy bands in the spinel-type semiconductor CdIn2S4 are calculated by using the Heine-Abarenkov model potential method. About 500 plane waves are used to obtain convergent results for this crystal which has 64 valence electrons in the unit cell. Semiconductor-like band structure is obtained with 0.75 eV direct gap at Γ. It is found that two types of indirect transition Λ3Γ1, Σ4Γ1 can occur just below this energy. Atomic characters of the bands at Γ near the gap are examined by calculating the average charge densities inside the atomic spheres from the obtained pseudo-wave-functions. It is seen that the p-levels of all the constituent atoms contribute to the valence bands near the gap.
    Download PDF (724K)
  • Masaru Kasahara, Itaru Tatsuzaki
    1974 Volume 36 Issue 3 Pages 786-792
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The second order quadrupole shifts of 87Rb nuclear magnetic resonance in single crystals of RbDSO4 are measured from 18°C to −100°C and are analysed by Volkoff method. In paraelectric phase there are two inequivalent electric field gradients (EFG), one of which hardly shows the temperature dependence and the other increases slightly with decreasing temperature. In ferroelectric phase (Tc=−22°C) each component of the EFG tensors splits into two components. Their splittings change as (TcT)β, where β for each component of the EFG tensor takes the value in the range from 0.28 to 0.39. The orientations of the principal axes of EFG in ferroelectric phase are found to change with temperature. The principal coordinate system which shows almost no temperature dependence in magnitude of the quadrupole coupling constant rotates about the principal z axis by the angle of 75° over the temperature range studied.
    Download PDF (888K)
  • Noboru Fukuoka, Haruo Saito, Yukichi Tatsumi
    1974 Volume 36 Issue 3 Pages 793-799
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Isochronal annealing of the defect induced in germanium by electrons of 10, 5 or 1.5 MeV or fast neutrons was studied. For the case of crystals irradiated with 10 MeV or 5 MeV electrons, an annealing stage was observed in the range 180 K–240 K. The stage was observed in all specimens doped with antimony, arsenic or phosphorus after irradiation with 10 MeV electrons, but it was not observed for crystals irradiated with 1.5 MeV electrons. These behaviours were discussed and it was concluded that the defect which anneals in the stage is considered to be a stable vacancy-interstitial pair. Considering from the fact that the annealing in the range 260 K–480 K was independent of irradiating energies, the induced defects by 10 MeV electron irradiation are of the same kind as those induced by 1.5 MeV electron irradiation except for the stable vacancy-interstitial pair which anneals near 200 K.
    Download PDF (840K)
  • Takehiko Hidaka
    1974 Volume 36 Issue 3 Pages 800-807
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A theory for Szigeti effective charge es* is constructed using the concept of the second-nearest-neighbor electron interaction. The main source of es* is the bond-electorn movement along the bond axis induced by the ion displacement. The theoretical expression for es* is found to be Zfie0×(1−KQZEg2), where Z is the valence, e0 is the elementary charge, fi is the electronic ionicity given by phillips, Eg is the optical effective band gap, Q is the magnitude of the bond-electron charge, and K is a constant. Agreement between experiment and theory for 17 tetrahedral crystals is given.
    Download PDF (1004K)
  • Kohnosuke Sato, Tadashi Sekiguchi
    1974 Volume 36 Issue 3 Pages 808-814
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Various fundamental properties of the CO2 gas-dynamic laser are investigated in detail by means of a conventional shock tube with 70 mm inner diameter and nearly 9 m in length. The effect of the catalyzer-gas composition on the output power is studied, and the optimum content of helium gas is found to be about 70∼80% and that of water vapor is about 2%. The dependence on the stagnation temperature (Tst) and pressure (Pst) is also examined. The optimum value of Tst for the mixture of 0.2 CO2+0.8 N2 and for 0.1 CO2+0.2 N2+0.7 He is about 2400 K and 1700 K, respectively. The output power increases with increasing Pst, and tends to saturate at the Pst-value of 4 to 6 atmospheric pressure. The optimum distance from the nozzle throat is 9±2 cm. The maximum value of the peak output power is nearly 20 W and the power density is about 3 W/cm3.
    Download PDF (740K)
  • Noriaki Tsukada, Toru Ogawa
    1974 Volume 36 Issue 3 Pages 815-819
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    By means of a theoretical approach recently developed by Pegg and Series, the consequences of misalignment of an oscillating rf field in optical-rf double resonances are investigated. Effects of both the longitudinal pumping and the transverse pumping are considered. We show that the single (or ordinary) or multiple quantum resonances and the transverse resonance appear at integral multiples of the oscillating field frequency simultaneously. It is also shown that there is no essential difference between the parametric resonance and the Haroche resonance, namely the transverse resonance becomes the parametric resonance for misalignment angle θ=90° and becomes the Haroche resonance for θ=0°.
    Download PDF (468K)
  • Tomokazu Kato
    1974 Volume 36 Issue 3 Pages 820-825
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The unperturbed distribution function of the distance between the i-th and j-th segments of a chain polymer molecule is assumed to be the distribution function of the |j-i| steps random flights. The expansion coefficient of the excluded volume effect of chain molecule is calculated with this distribution function by the method of cluster expansion. The number and types of clusters under consideration and the acquired asymptotic behavior of the expansion coefficient are identical with the previous report. The expansion coefficient is expressed in a closed from by the aid of the error function as
    (Remark: Graphics omitted.).
    Download PDF (484K)
  • Kunizo Onda
    1974 Volume 36 Issue 3 Pages 826-838
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The variational method is developed to attack the scattering of low energy electrons by polyatomic molecules. The form chosen for a trial function is F(r)=Fshort(r)+Flong(r), where Fshort(r) is the linear combination of quadratically integrable functions with their centers at constituent atoms of the molecule, r the position vector of the scattered electron, and Flong(r) chosen so as to include distortion of the scattered wave caused by long range forces is smoothly connected to the free particle wave function. The applicability of this theory is tested by a numerical example, in which the calculation is made for the elastic scattering of electrons by the static field of H2 in the two-center coordinate system and the results are compared with the Hara’s (J. Phys. Soc. Japan 27 (1969) 1009).
    Download PDF (1352K)
  • Shinji Muramatsu, Nobuhiko Sakamoto
    1974 Volume 36 Issue 3 Pages 839-842
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Temperature dependence of absorption band shape for transitions to the Jahn-Teller coupled states is investigated quantum mechanically using a simple model by Longuet-Higgins et al. It is found that a band shape for weak coupling which has a single band at low temperatures splits into two bands with increasing temperature. Comparing the results with those calculated by semiclassical method, it is shown that a quantum mechanical band shape reduces to a semiclassical one in strong and high temperature.
    Download PDF (396K)
  • Kunizo Ohkubo, Shigetoshi Tanaka
    1974 Volume 36 Issue 3 Pages 843-851
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The dispersion and spatial damping of Whistler waves propagating in plasma columns having relatively high electron density and moderate electron temperature are investigated theoretically and experimentally. In collisionless hot plasmas, the damping rate ki, wavenumber kr and the ratio kikr as functions of frequency ω are derived in the vicinity of the cyclotron resonance. When the effects of collisions become significant, the above quantities are corrected by including the collision frequency ν appropriately. Near the resonance, kikr equal to the sum of the cyclotron damping term and the collisional damping term which is proportional to ν⁄ωc. The observed dispersion curves agree well with those in collisional hot-plasma theory. The observed damping rate is due to the cyclotron damping plus Coulomb collisional damping in moderate Te plasmas, while it is ascribed totally to Coulomb collisions in low Te plasma.
    Download PDF (1120K)
  • Yoshiomi Kondoh, Shigeo Nagao, Keiichiro Sugita, Hiroshige Watanabe
    1974 Volume 36 Issue 3 Pages 852-856
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The system with a toroidal helical magnetic axis is re-examined numerically to obtain the minimum displacement of the plasma column in an infinitely conducting chamber wall. The results of the numerical calculation show that in order to minimize the displacement of the plasma column in the toroidal helical system, we should have a device with a large number of pitch n, for example n=32, and in such a device the β value of the equilibrium state is permitted up to 100 percent. A rule which determines the optimum condition for the minimization of the displacement is shown by the figure.
    Download PDF (560K)
  • Susumu Shioda
    1974 Volume 36 Issue 3 Pages 857-860
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The ambipolar diffusion boundary layer induced in a thermally ionized high pressure gas is analyzed theoretically with the isothermal assumption. The thickness of the boundary layer and the density and potential profiles are calculated analytically. These results are compared with those given by the non-linear ambipolar diffusion throry for the positive column of a weakly ionized gas discharge.
    Download PDF (404K)
  • Naruyoshi Asano
    1974 Volume 36 Issue 3 Pages 861-868
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Modulation of a nonlinear wave in a dissipative and dispersive medium is considered by the method of multiple scales. The slow variables for the amplitude are determined by the coupling between the nonlinearity of the envelope wave and the dissipative or dispersive effect. A perturbation theory is developed for a system of equations which, when linearized, has a plane wave solution with complex frequency of a small imaginary part. Governing equation for the amplitude becomes a type of generalized nonlinear Schrödinger equation in three dimensions. For spatially periodic case, there may be the case that small dissipation can make the wave grow depending on the initial amplitude. As an illustrative example of the general theory, modulation of the convective mode in a fluid layer heated from below is considered.
    Download PDF (764K)
  • Syozo Kubo
    1974 Volume 36 Issue 3 Pages 869-874
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    This paper deals theoretically with a radiative heat transfer through an absorbing-emitting medium which occupies a semi-infinite space bounded by a plane wall. A steady one-dimensional problem is considered. The medium is assumed to be grey and to be in a local thermodynamic equilibrium. Effects due to the emission from the wall, specular and diffuse reflection at the wall and external beam radiation through the wall are considered in contrast with the Milen problem, in which no radiation comes into the medium through a purely transparent boundary. The general solution is obtained. The solution is studied in detail in five special cases to show each effect of these boundary conditions. They are the cases of pure emission, pure beam radiation input, pure reflection, a uniform asymptotic field and emission accompanied by diffuse reflection. In the second case, a localized temperature change is found in the neighbourhood of the wall, even when the asymptotic field has a uniform temperature.
    Download PDF (544K)
  • Hideaki Takagi
    1974 Volume 36 Issue 3 Pages 875-877
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The Stokes flow for the case in which two solid spheres in contact are steadily rotating with different angular velocities about their line of centers is studied. In particular, it is shown that the couple experienced by a sphere in contact with a fixed infinite plane perpendicular to the axis of rotation is increased by a factor (Remark: Graphics omitted.) as compared with its value in the absence of the plane. It is also found that, for the case of two equal spheres, one of which is kept rotating with angular velocity ω while the other is left free, the latter will rotate with angular velocity ω⁄7.
    Download PDF (252K)
  • Masakazu Katagiri
    1974 Volume 36 Issue 3 Pages 878-883
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    To approximate unsteady boundary layer flows induced by an impulsive motion of a body, a model of an external stream preceded by an accelerating process is presented, which might have been realized in the laboratories. The variation with time t of an external stream is assumed to be in the form V(t)=1−exp(−αtn), where α means a coefficient of acceleration. By employing this acceleration process, flows near the forward and rear stagnation points on an infinite plane wall are investigated. Numerical studies show that the time lag of an external stream gives rise to a remarkable lag in time to the response of the boundary layer and evaluated time elapsed before the boundary layer near the rear stagnation point begins to separate is found to disagree with that of impulsive motion when the acceleration is slow and gradual.
    Download PDF (696K)
  • Yasutaro Tanaka
    1974 Volume 36 Issue 3 Pages 884-893
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    As for an idealized elastico-viscous liquid, what is generally called Walters’ liquid B′ the constitutive equations of integral type are transformed into a form appropriate to the fluid-mechanical analysis. From resulting equations, the boundary-layer equations for the elastico-viscous liquid are obtained.
    In a slightly elastic case, the flow past a semi-infinite flat plate is analyzed by adopting the conventional Kármán-Pohlhausen method. It is found that the presence of elasticity causes the boundary-layer thickness to remain finite at the front edge of the plate and increase throughout downstream and so the drag on the wall decreases in comparison with Newtonian fluids.
    Download PDF (824K)
  • Shigeki Morioka, Toshisada Miki
    1974 Volume 36 Issue 3 Pages 894-902
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Hall effect in a steady flow of a conducting gas past a thin wedge section in a strong aligned magnetic field is considered within the linearized theory. The flow field around the obstacle is found by the numerical integration of the Fourier transform. The outer flow is estimated by the method of asymptotic expansions. It is shown that the Hall effect leads to a dispersive field, which differs variously in association with the conductivity and compressibility of the flow, and that it tends to revive the ordinary gasdynamic aspects.
    Download PDF (916K)
  • Ryozo Oyamada
    1974 Volume 36 Issue 3 Pages 903-905
    Published: March 15, 1974
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The Raman spectra of PbCl2–KCl system are investigated in the fused state. The spectrum of the fused PbCl2 at 505°C exhibits two Raman lines at 120 cm−1 (depolarized) and 205 cm−1 (polarized). These lines can be assigned to Cl–Pb–Cl deformation mode (ν4, E1) and Pb–Cl stretching mode (ν1, A1) respectively, because we can expect that [PbCl3] ion-like local structure is predominant in the fused state considering the crystal structure of the pure PbCl2. The chemical shift of the 205 cm−1 line up to 230 cm−1 is observed with increasing KCl concentration, indicating that the chain structure of the [PbCl3] ions is broken into individual [PbCl3] ions due to the addition of KCl.
    Download PDF (336K)
  • Kazuyoshi Hirakawa, Junichi Yoshinaga, Hidetoshi Miike
    1974 Volume 36 Issue 3 Pages 906
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (128K)
  • Yuuki Kawarasaki
    1974 Volume 36 Issue 3 Pages 907
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (184K)
  • Toshiaki Tatsukawa, Masasi Inoue, Hisao Yagi
    1974 Volume 36 Issue 3 Pages 908
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (132K)
  • Hiroshi Fujiwara, Kazuo Ohishi, Hideoki Kadomatsu, Motoyuki Nomura
    1974 Volume 36 Issue 3 Pages 909
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (152K)
  • Akira Sawaoka, Carl T. Tomizuka
    1974 Volume 36 Issue 3 Pages 910
    Published: March 15, 1974
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Download PDF (124K)
feedback
Top