Penning ionization of substituted benzenes (aniline, phenol and thiophenol) by collision with He*(23S) metastable atoms

Naoki Kishimoto, Masayuki Furuhashi, Koichi Ohno

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Penning ionization electron spectra of substituted benzenes (aniline, phenol and thiophenol) upon collision with He*(23S) metastable atoms were observed, and a collision energy dependence of partial ionization cross-sections (CEDPICS) of the sample molecules was studied using collision-energy-resolved Penning ionization electron spectroscopy. CEDPICS indicates that the interaction potential between He* and the target molecule was anisotropic in the studied collision energy range (90-300 meV). The interaction potential around the hetero atoms and the out-of-plane direction of the phenyl ring is attractive, while a repulsive interaction around the hydrogen atoms was derived from the small negative slope of CEDPICS for ionization from π orbitals and model potential calculations. An attractive interaction around the nitrogen atom of aniline indicates the `lone pair' character of the nonbonding molecular orbital. For thiophenol, the interaction potential for the out-of-plane direction around the sulfur atom is attractive in contrast to the in-plane direction. In contrast, the interaction potential for the in-plane direction around the oxygen atom is attractive in the case of phenol. Assignments of photoelectron spectra for ionization from π and nonbonding orbitals were confirmed utilizing large-band intensity in the Penning ionization electron spectra reflecting extending molecular orbitals and an attractive interaction.

本文言語English
ページ(範囲)35-48
ページ数14
ジャーナルJournal of Electron Spectroscopy and Related Phenomena
113
1
DOI
出版ステータスPublished - 2000 12月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 放射線
  • 原子分子物理学および光学
  • 凝縮系物理学
  • 分光学
  • 物理化学および理論化学

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