Angle-energy distributions of Penning ions in crossed molecular beams. II. Effect of Penning electron recoil in Ne*(3s 3P2)+H,D → +Ne+H+,D++e-

A. Khan, H. R. Siddiqui, P. E. Siska

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Abstract

Relative doubly differential cross sections for Penning ionization in the title systems are reported at a mean collision energy of 10.4 kcal/mol in a crossed supersonic beams experiment. As in paper I of this series on He* (21S) + H,D, the H+,D+ products are scattered sharply forward with respect to the incident H,D in the center-of-mass frame, but with the release of an additional 30 kcal/mol into translational energy at the peak of the distribution. Unlike the results of paper I, we find that a single optical potential, corresponding to an autoionizing state of NeH of assumed 2Σ+ symmetry, consistently represents the main features of both previously reported low-energy Penning ionization electron spectroscopy (PIES) data and the present results. Agreement between theory and experiment in the angular distributions is improved by including coupling between the angular momenta of the Penning electron and the atoms after ionization. The resonance width for PI is found to be nonexponential, showing a "saturation" effect at small distance. This is interpreted in terms of the ionic (charge transfer) character of the bonding in NeH*.

Original languageEnglish (US)
Pages (from-to)3371-3380
Number of pages10
JournalThe Journal of chemical physics
Volume95
Issue number5
DOIs
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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