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We show that strong non-Franck–Condon effects observed in (2+1) resonance enhanced multiphoton ionization of the C 3Πg state of O2 are due to the kσu shape resonance previously observed in single-photon studies of diatomic molecules. Calculated vibrational branching ratios for the v′=2,3 levels of the C 3Πg state are in reasonable agreement with experiment. Certain discrepancies remain in comparing theoretical results with the measured spectra, and possible electron-correlation effects which underly this are discussed.
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Stephens et al. (1988) studied this question.
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