Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 64, Issue 11
Displaying 51-59 of 59 articles from this issue
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  • Ce3+ Centres in YAlO_3 (YAP) Single Crystals
    Tetsuhiko Tomoki, Hirokatsu Ishikawa, Tomoji Tashiro, Moritaka Katsure ...
    Subject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
    1995 Volume 64 Issue 11 Pages 4442-4449
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4442
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    Spectra of optical absorption (3 eV -- 6 eV) and emission(2.9 eV -- 4.1 eV) have been investigated onCe3+ centres inYAlO3:Ce3+ single crystals at 297 K; excitation spectrum for360 nm light in the Ce3+ emission band region has also beenmeasured in the region of 3.5 eV -- 6.2 eV. Measurement ofexcitation spectrum for Ce3+ centres in YAlO3:Ce3+ powderphosphor has been made at room temperature in the region of 3 eV--11 eV. The excitaticn spectra in the air UV region consist of fivebands assignable to the five levels of the Ce3+ 5d; they areexpressible by Gaussian functions, respectively, and therefrom thecrystalline field splitting 10Dq=1.128 eV is derived. Theexcitation spectrum in the VUV region has a great peak at 8.05 eVwhich originates from the valence-band excitons. It is confirmed thatthe luminescence band expressed in terms of quanta per unitphoton-energy interval can be fitted by two Gaussian components.
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  • Electronic States and Energy Transfer in PbI_2 Clusters Dispersed in CdI_2 Crystals
    Ping Gu, Masayuki Watanabe, Tetsusuke Hayashi
    Subject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
    1995 Volume 64 Issue 11 Pages 4450-4460
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4450
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    Luminescence associated with small PbI2 clusters formed inPb1-xCdxI2 solid solutions has been investigated in the rangeof x between 0.4 and 0.9. Time-resolved measurements reveal that theluminescence at the absorption edge of crystals consists of the bandswith short (sub-ns) and long (μ s) decay times. The two bands arefound to originate from the states related to 3P1 and3Poof Pb2+ ions. The energy split between the two states increaseswith decrease in the size of PbI2 clusters. The result is explainedby the change in an exchange energy of electron and hole with thecluster size. Dependences of luminescence decay times on theluminescence and excitation energies indicate that energy transfertakes place among clusters. Temperature dependences of luminescencespectra and decay times are interpreted by the energy transferprocess.
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  • Optical Study of the Triplet State in NaNO_2 Crystals: Excitonic Aspects of Phosphorescence Spectra
    Osamu Ohta, Riso Kato
    Subject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
    1995 Volume 64 Issue 11 Pages 4461-4472
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4461
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    The triplet absorption and phosphorescence spectra of NaNO2crystals have been studied in the temperature range of 1.8 --40 K. Intensity distribution of vibronic lines of the absorption iswell described by the Franck-Condon factors, while that of thephosphorescence shows poor agreement with the factors. The intensityof the ν 00 line of the phosphorescence is about 1/10 of thatexpected from the factors. The profile of the phonon sideband of theν 00 line in the phosphorescence is not exactly a mirror image ofthat in the absorption with respect to the ν 00 line at 2 K. Theformer approaches the latter around 30 K. Ratio of the integratedintensity of the ν 00 line to that of the one-phonon sideband is0.52 for the absorption and 0.19 for the phosphorescence at 2 K. Theratio for the phosphorescence becomes close to that for the absorptionat 30 K. These facts are interpreted in terms of an exciton picture.
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  • Resonant Enhancement of Radiation from a Backward Wave Oscillator Utilizing Large Diameter Corrugated Metal Structure
    Md. Ruhul Amin, Kazuo Minami, Kazuo Ogura, Xiaodong Zheng, Tsuguhiro W ...
    Subject area: Electromagnetic technology.
    1995 Volume 64 Issue 11 Pages 4473-4484
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4473
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    An experiment on a backward wave oscillator (BWO) utilizing a largediameter corrugated metal wall slow wave structure (SWS) has beenpresented. Measurements are made above and below the starting beamenergy for conventional BWO operation. For the latter case, an excitednoise-level backward wave at 20 GHz (TM01 mode) is coupled at theends of the SWS to a forward anomalous Doppler shifted electroncyclotron (EC) beam mode which amplifies the original oscillation byan amount of 50 dB. Resultant microwave output powers of 200 kW with4.5 magnetic field for an electron beam with energy 35 keV. Unlike the well-known fast wave devices, our slow wave EC device is simple to operate utilizing an electron beam with dominant parallel velocity in a uniform magnetic field.
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  • The Phase Diagram of the Anisotropic Spin-1 Heisenberg Chain
    A. L. Malvezzi, F. C. Alcaraz
    Subject area: Statistical physics and thermodynamics.
    1995 Volume 64 Issue 11 Pages 4485-4486
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4485
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  • Relationship between Density and Magnetic Field Fluctuations in the MHD Regime
    Hitoshi Hojo
    Subject area: The physics of plasmas and electric discharges.
    1995 Volume 64 Issue 11 Pages 4487-4488
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4487
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  • Neutron Diffraction Study of C14-Laves Phase TbMn_2
    Kazuko Inoue, Yoji Nakamura, Yasuo Yamaguchi, Masayoshi Ohashi, Kenji ...
    Subject area: Magnetic properties and materials.
    1995 Volume 64 Issue 11 Pages 4489-4490
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4489
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  • Neutron Scattering Study of the 1 K Transition in a Heavy Fermion System UCu_5
    Naoto Metoki, Toyotaka Osakabe, Yukio Morii, Yoshichika Onuki, Muneyuk ...
    Subject area: Magnetic properties and materials.
    1995 Volume 64 Issue 11 Pages 4491-4492
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4491
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  • Optical Emission of TlBr Doped with Iodine Ions
    Atsuhiro Fujii, Tomohiro Kudou
    Subject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
    1995 Volume 64 Issue 11 Pages 4493-4494
    Published: November 01, 1995
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.64.4493
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