Non‐Franck–Condon transitions in resonant autoionization of N2O

Autor:	Paul‐Marie Guyon, T. R. Govers, René Botter, I. Nenner, Tomas Baer, Abdallah Tabché‐Fouhaillé, Luis F. A. Ferreira
Rok vydání:	1979
Předmět:	Chemistry Polyatomic ion General Physics and Astronomy Zero-point energy Electron Photoionization Molecular physics Ion Autoionization X-ray photoelectron spectroscopy Excited state Physics::Atomic and Molecular Clusters Physics::Atomic Physics Physical and Theoretical Chemistry Atomic physics
Zdroj:	The Journal of Chemical Physics. 70:1585-1592
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.437697
Popis:	Autoionization of N2O between 12.89 and 16.4 eV was investigated by photoionization using the pulsed synchrotron radiation from ACO, Orsay’s storage ring. Measurements were performed of threshold photoelectron spectra, photoionization spectra, and of photoelectron energy spectra. The latter were obtained from photoelectron time of flight distributions at selected wavelengths. The results suggest that autoionization in the Franck–Condon gap between the ? 2Π and the ? 2Σ+ states of N2O+ proceeds via two distinct mechanisms. The major autoionization process (?90%) produces the ? 2Π state in its low vibrational levels, while a resonant autoionization path (?10%) produces vibrationally excited ? 2Π ions. The latter process is associated with the production of low energy electrons with a distribution peaking sharply at zero energy. This resonant autoionization process appears to be a general phenomena for polyatomic molecules.
Databáze:	OpenAIRE
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