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Autodetachment Dynamics of Acrylonitrile Anion Revealed by Two-Dimensional Electron Impact Spectra

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Regeta Khrystyna , Allan Michael,
Project Chemical and Physical Processes from Electron-Molecule Interactions
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Original article (peer-reviewed)

Journal Physical Review Letters
Volume (Issue) 110
Page(s) 203201
Title of proceedings Physical Review Letters
DOI 10.1103/PhysRevLett.110.203201

Open Access

Abstract

Two-dimensional electron energy-loss spectra of acrylonitrile are presented in the incident energy range 0.095–0.9 eV, where the incoming electron is temporarily captured in the lowest pi* orbital. The cross section is plotted as a function of the incident electron energy that determines which vibrational resonant anion state is populated, and of the electron energy loss, that shows into which final vibrational states each resonance decays. The striking result is that besides the expected horizontal (for given resonances) and vertical (for given final states) patterns of peaks, diagonal arrangements of peaks are observed. They reveal restrictive selectivity with respect to which vibrations are de-excited in the detachment process, with nu4 (C-N stretch) and nu7 (C—H rocking) dominating. Surprisingly, all spectral features could be assigned to vibrational levels of the valence pi* resonance, and none to dipole-bound vibrational Feshbach resonance, although the latter must also exist in this energy range.
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