Collisional Quenching and Photochemistry of trans-Glyoxal (3Au) Molecules

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Abstract
The time dependence of phosphorescence from gaseous trans‐glyoxal 3 Au at relatively low pressures excited by a tunable dye laser has been studied in the presence of pure argon and in gas mixtures containing O2, NO, and di‐tert‐butyl nitroxide. Apparent quenching cross sections for trans‐glyoxal 3 Au have been measured for these collision partners at 300°K. Some measurements have been carried out with trans‐glyoxal‐d 2. The magnitudes of the cross sections are discussed in terms of possible photochemical or photophysical quenching. A new model, which is consistent with the known photochemistry and with the quenching rates measured here, is proposed for the photodecomposition of trans‐glyoxal 3 Au to form CO.