Journal of the Spectroscopical Society of Japan
Online ISSN : 1884-6785
Print ISSN : 0038-7002
ISSN-L : 0038-7002
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Volume 56, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • Chemometrics in Terahertz Spectral Imaging and Application to Cancer Tissue Analysis
    Hiromichi HOSHINA
    2007 Volume 56 Issue 5 Pages 207-213
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.207
    JOURNAL FREE ACCESS
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    Terahertz spectroscopic images of paraffin embedded cancer tissues have been measured by a terahertz time lomain spectrometer. For the systematic identification of cancer tumors, the principal component analysis and the:, lustering analysis were applied. In three of four samples, the cancer tissue was recognized as an aggregate of the lata points in the principal component plots. By the agglomerative hierarchical clustering, the data points were well categorized into cancer and the other tissues. This method can be also applied to various kinds of automatic liscrimination of plural components by terahertz spectroscopic imaging.
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  • Liquid-Solid Phase Transition of Benzene under Shock Compression Studied by Time-Resolved Coherent Anti-Stokes Raman Spectroscopy
    Akitaka MATSUDA
    2007 Volume 56 Issue 5 Pages 214-218
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.214
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    Phase transition of benzene has been studied under laser-shock compression up to 4.2 GPa by using nanosecond time-resolved coherent anti-Stokes Raman spectroscopy. The shock wave is generated by irradiation of 10-ns pulsed laser beam on the plasma confinement target and its pressure is estimated from a particle velocity, which is measured by a velocity interferometer. The temporal evolution of the wavenumber shift of the ring-breathing mode and the C-H stretching mode is investigated. A metastable supercompressed state and a liquid-solid phase transition are observed under shock compression. Time-resolved Raman spectra reveal that the liquid state is ini-tially preserved and rapidly transforms to the solid state within 25 ns under shock compression at 4.2 GPa.
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  • [title in Japanese]
    [in Japanese]
    2007 Volume 56 Issue 5 Pages 219-220
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.219
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2007 Volume 56 Issue 5 Pages 221
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.221
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2007 Volume 56 Issue 5 Pages 222-223
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.222
    JOURNAL FREE ACCESS
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  • Plasma and Spectroscopic Analysis
    V. Plasma Diagnostics by Spectroscopic Methods
    Koichi SASAKI
    2007 Volume 56 Issue 5 Pages 224-236
    Published: October 15, 2007
    Released on J-STAGE: January 04, 2011
    DOIhttps://doi.org/10.5111/bunkou.56.224
    JOURNAL FREE ACCESS
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    Plasma diagnostics by spectroscopic methods are reviewed with the emphasis on measurements of radical densities in reactive plasmas used for material processing. A brief introduction on the radiation equilibrium of plasmas will be given on the basis of a collisional-radiative model. Optical emission spectroscopy (OES) is an economical diagnostic method, but simple OES is not useful for estimating radical densities. An improved OES method is actinometry, which is widely used in reactive plasma experiments. Active spectroscopic methods such as absorption spectroscopy and laser-induced fluorescence are more reliable for measuring radical densities. Various types of absorption spectroscopy using various light sources will be introduced after a brief description of the fundamentals of optical absorption. The advantages of laser-induced fluorescence are the compatibility with imaging spectroscopy and the applicability to measurements of various quantities in plasmas.
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