Journal of the Spectroscopical Society of Japan
Online ISSN : 1884-6785
Print ISSN : 0038-7002
ISSN-L : 0038-7002
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Volume 57, Issue 6
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    2008 Volume 57 Issue 6 Pages 273-274
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.273
    JOURNAL FREE ACCESS
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  • Fourier Transform Infrared Difference Spectroscopy: Analyses of Active-site Structures and Molecular Mechanisms of Proteins
    Takumi NOGUCHI
    2008 Volume 57 Issue 6 Pages 275-287
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.275
    JOURNAL FREE ACCESS
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    For full understanding of the molecular mechanisms of enzymatic reactions, it is crucial to obtain the detailed structural information of the active sites of proteins. Reaction-induced Fourier transform infrared (FTIR) difference spectroscopy, which detects minute changes in the infrared absorption upon some reaction, is a powerful method to investigate the structures and reactions in the active sites of proteins at the atomic and molecular levels. In particular, light-induced FTIR difference spectroscopy that uses light as a trigger to initiate reactions has been extensively used in the studies of molecular mechanisms of photosensitive proteins. In this review article, the methods of measurement and analysis of light-induced FTIR difference spectra are described and applications to the studies of photosensitive proteins are introduced.
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  • Vibrational relaxations in liquid water observed by mid-infrared ultrafast spectroscopy
    Satoshi ASHIHARA
    2008 Volume 57 Issue 6 Pages 288-293
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.288
    JOURNAL FREE ACCESS
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    Nonlinear vibrational spectroscopy by use of mid-infrared femtosecond pulses enables the observation of ultrafast vibrational/structural dynamics of molecular systems. This article presents the recent experimental studies on vibrational energy relaxations and energy transfer in liquid water. In pure liquid water, vibrational energy relaxation of OH-stretching and OH-bending excitation occurs at about 200fs and 170fs, respectively. When vibrational energy from individually excited water molecules is transferred to intermolecular modes, a sub-100fs nuclear rearrangement occurs, leaving the local hydrogen bonds weakened but unbroken. Subsequent energy delocalization over many molecules proceeds with the breaking of hydrogen bonds on an 1-ps time scales. The observed vibrational/structral response should be relevant for chemical reactions and structural changes in aqueous environments.
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  • [title in Japanese]
    [in Japanese]
    2008 Volume 57 Issue 6 Pages 294-296
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.294
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2008 Volume 57 Issue 6 Pages 297-298
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.297
    JOURNAL FREE ACCESS
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  • Modern X-ray Spectroscopy VI. Using X-rays to probe phonons
    mainly in disordered materials
    Shinya HOSOKAWA
    2008 Volume 57 Issue 6 Pages 301-312
    Published: December 15, 2008
    Released on J-STAGE: January 13, 2012
    DOIhttps://doi.org/10.5111/bunkou.57.301
    JOURNAL FREE ACCESS
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    Recently, studies of phonons by inelastic x-ray scattering (IXS) technique with a high energy resolution of meV order have considerably developed by using an excellent technique for utilizing third-generation synchrotron radiation facilities and recent progress of semiconductor technique. In this article, the history of studies of phonons using x-rays, the principle of IXS and the advantage (disadvantage) of IXS are briefly reviewed by comparing to inelastic neutron scattering, and an excellent IXS spectrometer installed at the beamline BL35XU of the SPring-8 is introduced. Finally, examples of recent studies performed at BL35XU/SPring-8 are introduced in mainly disordered systems.
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