Absorption Band Shapes and Molecular Reorientation of Liquid Methyl Cyanide
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概要
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The shapes and intensities of the fundamental bands of liquid methyl cyanide were observed by conventional transmittance method. Using the refractive indices observed by the ATR method, the observed absorption indices were corrected for the dielectric-field effect. The band shapes were analyzed from the point of view of moment analysis or correlation-function analysis. The results indicate that the shapes of <I>a</I><SUB>1</SUB>-type vibrations are good Lorentzian shapes, while those of the <I>e</I>-type can be explained as superpositions of Lorentzian and Gaussian functions. It is also found that the band-widths of the <I>e</I>-type vibrations were quite different from each other. Taking into account the effect of vibration-rotation interaction on the band-widths, the disagreement could be explained well. From the analyses of the band shapes of ν<SUB>7</SUB> and <I>nu</I><SUB>8</SUB>, the life-time function, ψ(<I>t</I>), was obtained; it represents the decay of the fraction of freely-rotating molecules.
- 公益社団法人 日本化学会の論文
著者
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Kakimoto Masao
Department of Chemistry, Faculty of Science, The University of Tokyo
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Fujiyama Tsunetake
Department of Chemistry, Faculty of Science, The University af Tokyo
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