An ion-impact study of singlet-triplet transitions in ethylene and alkyl-substituted ethylenes.
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概要
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The <I>T</I>←<I>N</I> (π→π<SUP>*</SUP>) transitions in ethylene, all of its methyl derivatives, and 1-butene were observed by means of He<SUP>+</SUP>-impact energy-loss spectroscopy. With a resolution of better than 0.1 eV, a vibrational structure was just resolved in the <I>T</I>←<I>N</I> excitation spectrum of ethylene. The <I>T</I>←<I>N</I> transition energy was measured for the alkylethylenes with a lower resolution. The results are in good agreement with the electron-impact data, indicating that the vibro-rotational excitation due to the impulsive momentum transfer is negligible in the present method. The <I>T</I>←<I>N</I> excitation cross-sections were found to decrease by half upon the unit substitution of alkyls. The relative invariance of the <I>T</I>←<I>N</I> transition energy and the decrease in the <I>T</I>←<I>N</I> cross-sections upon alkyl substitution may be attributable to the decrease in the intra- and intermolecular Coulomb and exchange interactions between π- and π<SUP>*</SUP>-orbitals.
- 公益社団法人 日本化学会の論文
著者
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Inouye Hokotomo
Research Institute For Scientific Measurements
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Sato Yukinori
Research Center for Advanced Computing Infrastructure, Japan Advanced Institute of Science and Technology, Nomi, Ishikawa 923-1292, Japan
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Satake Kazuki
Research Institute for Scientific Measurements, Tohoku University
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