Photoelectron spectroscopy of autoionizing Rydberg states of ammonia
- Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
Photoelectron spectroscopy was used to determine the ionic vibrational distributions following vibrational autoionization of Rydberg states of NH{sub 3}. Two-color, two-photon resonant, three-photon excitation via selected rotational levels of the NH{sub 3} C(tilde sign){sup '} {sup 1}A{sub 1}{sup '}(0200) intermediate state was employed to populate vibrationally autoionizing Rydberg states between the v{sub 2}{sup +}=1 and v{sub 2}{sup +}=2 ionization thresholds of the NH{sub 3}{sup +} X(tilde sign) {sup 2}A{sub 2}{sup ''} ground electronic state. As expected from the propensity rule for vibrational autoionization, ionization with {delta}v{sub 2}=-1 was found to be the dominant process. The observed vibrational distributions appear to be independent of the rotational quantum number of the autoionizing state. Partially resolved rotational structure was exhibited within the photoelectron spectra providing information on the assignments of the Rydberg states and on the mechanism for vibrational autoionization. (c) 2000 American Institute of Physics.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- OSTI ID:
- 20215435
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 9 Vol. 112; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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