ＥＩマススペクトルにおける気相イオンからの単分子分解反応の研究

DOI Web Site Web Site 参考文献37件

書誌事項

タイトル別名
  • Unimolecular Dissociation of Gaseous Ions in EI Mass Spectrometry.
  • EI マススペクトル ニ オケル キソウ イオン カラ ノ タンブンシ ブンカ

この論文をさがす

抄録

The fragmentation mechanisms of gaseous ions were studied experimentally and theoretically. In order to contribute to construction of fragmentation theory in mass spectra, the principle was examined using three separate approaches. Firstly, energy dependence on the fragmentation of molecular ions was investigated using the threshold electron-photoion coincidence (TEPICO) technique. Secondary, fragmentation mechanisms of molecular ions (n-butane, 1-propanol, n-propyl amine, and cycloglycylglycine cation radicals and a series of organosilicon cation radicals) in the low energy region were studied using ab initio molecular orbital (MO) methods. Finally, the dissociation (by hydrogen loss) of the first excited state (Ã2B1) of the formaldehyde cation as a function of its vibrational excitation was analyzed. Its mechanism involved an electronic predissociation by the ground X2B2 state in the tunneling regime. A statistical treatment for nonadiabatic interactions accounted for the low value of the rate constant as well as for a large isotope effect that persists over an energy interval of ca. 0.7 eV.

収録刊行物

  • 質量分析

    質量分析 46 (6), 477-482, 1998

    一般社団法人 日本質量分析学会

参考文献 (37)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ