Photoelectron spectroscopy of atomic oxygen using the Elettra synchrotron source |
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| Authors: | L J BEECHING A A DIAS J M DYKE A MORRIS S STRANGES J B WEST |
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| Institution: | 1. Department of Chemistry , University of Southampton , Highfield, Southampton, SO17 1BJ, UK;2. CEFITEC Department of Physics, Faculdade de Ciencias e Tecnologia , Universidade Nova de Lisboa , 2829-516, Caparica, Portugal;3. Dipartimento di Chimica , Universitá di Roma ‘La Sapienza’ , I-00185, Rome, Italy;4. TASC-INFM Laboratory , Basovizza, 34012, Trieste, Italy;5. CLRC Daresbury Laboratory , Daresbury, Warrington, WA4 4AD, UK |
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| Abstract: | Atomic oxygen has been studied using angle resolved photoelectron spectroscopy (PES) and constant-ionic-state (CIS) measurements using radiation from the Elettra synchrotron as the photon source. Relative partial photoionization cross-sections and angular distributions for the O+(4S) ← O(3P) and O+(2D) ← O(3P) ionizations have been measured as a function of photon energy from threshold (13.6 eV) to 19.0 eV. Comparison of the results obtained with recent experimental work performed at lower resolution reveals a number of differences and comparison with results of recent calculations shows the need for the inclusion of coupling intermediate between the j-j and L-S limits in future calculations of photoionization cross-sections and angular distributions. This work has demonstrated the feasibility of and results to be expected from angle resolved PES and CIS measurements on reactive intermediates at Elettra, a third-generation synchrotron source, and further studies on small molecular radicals are proposed. |
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