Abstract
The dissociation of glyoxal after excitation to low-lying vibrational levels of the first excited singlet state has been studied by using the method of molecular beam photofragment translational spectroscopy. Detection of products at masses 28, 29, and 30 provides unequivocal proof that the S/sub 1/ state of glyoxal predissociates in the absence of collisions. The product time-of-flight (TOF) spectra show the presence of three distinct dissociation channels, the major ones being formation of H/sub 2/CO + CO and the triple dissociation forming 2CO + H/sub 2/. The third minor channel is attributed to the formation of CO plus an H/sub 2/CO isomer, possibly hydroxymethylene. 2 figures.
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