Non-Franck–Condon transitions in resonant autoionization of N2O
- 15 February 1979
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 70 (4) , 1585-1592
- https://doi.org/10.1063/1.437697
Abstract
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.Keywords
This publication has 46 references indexed in Scilit:
- Observation of dissociative states of O2+by threshold photoelectron-photoion coincidenceJournal of Physics B: Atomic and Molecular Physics, 1978
- Formation and predissociation of CO+2(? 2Σ+g)The Journal of Chemical Physics, 1977
- Photoionization processes at threshold. I. Threshold photoelectron and photoionization spectra of CO2The Journal of Chemical Physics, 1976
- Autoionization of N2The Journal of Chemical Physics, 1976
- Autoionization in diatomic molecules studied by photoelectron spectroscopyJournal of Quantitative Spectroscopy and Radiative Transfer, 1971
- A Discussion on photoelectron spectroscopy - The role of autoionization in molecular photoelectron spectraPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1970
- Radiative Lifetimes and Total Transition Probabilities for Some Polyatomic SpeciesThe Journal of Chemical Physics, 1969
- Photoelectron Spectroscopy of Autoionization PeaksThe Journal of Chemical Physics, 1969
- Photoionization and Absorption Coefficients of N_2O*Journal of the Optical Society of America, 1968
- Higher Ionization Potentials of Linear Triatomic Molecules. II. CS2, COS, and N2OThe Journal of Chemical Physics, 1960