New Analysis of Low Frequency Raman Specrta of THF Aquesou Solution and its Coexisting Phase with Clathrate Hydrate

概要

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The coexisting phases of Clathrate Hydrate (CH) and low concentration aqueous solution of tetrahydrofuran (THF) or ice I_h has been studied using low frequency Raman spectroscopy. Observed low frequency Raman spectra were found to be reproducible by the linear combination of the Raman spectrum of pure CH and that of low concentration aqueous solution of THF or that of ice I_h. Moreover, the coexisting curve can be constructed from the analysis of spectra. In case of liquid phase, however, Raman spectra were not reproducible by the spectrum of pure water and that of pure THF. To reconstruct observed low frequency Raman spectra of THF aqueous solution of any concentration, we found that the additional vibrational mode was required in addition to that of pure water and that of pure THF. For low concentration range, low frequency Raman spectra of the liquid phase can be reconstructed by the linear combination of the Raman spectrum of pure water and that of 0.1 molar fraction aqueous solution of THU.
社団法人日本物理学会の論文
2003-08-15