Observation of anisotropic interactions between metastable atoms and target molecules by two-dimensional collisional ionization electron spectroscopy

Naoki Kishimoto, Koichi Ohno

Research output: Contribution to journalReview articlepeer-review

16 Citations (Scopus)

Abstract

Excited metastable atoms colliding with target molecules can sensitively probe outer properties of molecules by chemi-ionization (Penning ionization) from molecular orbitals in the outer region, since metastable atoms cannot penetrate into the repulsive interaction wall around the molecules. By means of two-dimensional measurements using kinetic energy analysis of electrons combined with a velocity-resolved metastable beam, one can obtain information on the anisotropic interaction between the colliding particles without any control of orientation or alignment of target molecules. We have developed a classical trajectory method to calculate the collision energy dependence of partial ionization cross-sections (CEDPICS) on the anisotropic interaction potential energy surface, which has enabled us to study stereodynamics between metastable atoms and target molecules as well as the spatial distribution of molecular orbitals and electron ejection functions which have a relation with entrance and exit channels of the reaction. Based on the individual CEDPICS, the electronic structure of molecules can also be elucidated.

Original languageEnglish
Pages (from-to)93-138
Number of pages46
JournalInternational Reviews in Physical Chemistry
Volume26
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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