The absolute quantum yield for the dissociation of glyoxal into carbon monoxide following excitation to seven (00, 71, 51, 81, 81 72, 21, 81 41) single vibronic levels (SVL) in the 1Au state are presented. Samples in the 1–10 torr pressure regime were studied. Significant vibronic and pressure dependencies were observed for all seven SVL examined. Dependencies arising solely from the characteristics of specific vibronic modes were found following excitation to two levels (81 and 81 41). The results are interpreted in terms of an excited-state mechanism which includes dissociation from vibrationally excited 3Au levels.
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Atkinson et al. (1978) studied this question.
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