Dipole oscillator strengths for the photoabsorption,photoionization and fragmentation of molecular oxygen |
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Authors: | CE Brion KH Tan MJ van der Wiel PhE van der Leeuw |
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Institution: | Department of Chemistry, University of British Columbia, Vancouver, V6T1W5 Canada;FOM Institute for Atomic and Molecular Physics, Amsterdam The Netherlands |
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Abstract: | The photoabsorption, photoionization and fragmentation of O2 have been studied using electron impact coincidence methods to obtain branching ratios and dipole oscillator strengths (cross-sections). The photoabsorption measurements cover the energy range 5–300 eV while the formation of electronic states of O2+ (photoelectron spectroscopy) and the resulting ionic fragmentation (photoionization mass spectrometry) are both measured from close to threshold up to photon energies of 75 eV. The binding energy spectra of O2 show peaks at 33, 47 and 57 eV in addition to those reported elsewhere in the literature. These peaks are assigned to multiple final ion states arising from photoionization of the inner valence orbitals. Structure in the O2+ electronic state partial oscillator strength curves is in good agreement with recent theoretical work which predicts the existence of several shape resonances. A quantitative picture of the dipole-induced breakdown of O2 is obtained for the energy range 12–75 eV. The photoionization efficiency is found to be constant above 20 eV. |
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