High resolution threshold photoelectron and photoion spectroscopy of oxygen in the 12-50 eV photon range
- 14 August 1994
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 27 (15) , 3415-3426
- https://doi.org/10.1088/0953-4075/27/15/017
Abstract
High resolution threshold photoelectron and photoion spectra of the oxygen molecule have been measured in the photon energy range 12-50 eV using a penetrating field electrostatic analyser and a synchrotron radiation source. Besides the well known X 2 Pi g, a 4 Pi u, A 2 Pi u, b 4 Sigma g-, B 2 Sigma g-, c 4 Sigma u- O2+ states, several other series of vibrational structure are observed in the 21-24 eV range. One series is interpreted to result, not from an ion state, but from an autoionization process involving a neutral state and the nuclear continuum of an ion state. Above 26 eV, three relatively strong features are observed at approximately 27.3 eV, 32.5 eV and 39.5 eV, interspersed with several weaker ones. Dissociation processes from some O2+ states have been studied using a threshold photoelectron-photoion coincidence technique (TPEPICO). These observations identify the weak, broad feature at 24.96 eV as the nu =2 level of the c 4 Sigma u- state.Keywords
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