Vibrational relaxation in the A1A′(1B1) electronic state of 4-methyl-1,2,4-triazoline-3,5-dione

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Abstract
The fluorescence decay rate from selected vibronic levels of the A1A′(1B1) excited electronic state of 4‐methyl‐1,2,4‐triazoline‐3,5‐dione has been examined as a function of added inert gas pressure. A simple, physically reasonable model is presented from which vibrational relaxation rates may be explicitly determined. The relaxation rate constants have been found to be 6.3×105 Torr−1 sec−1 for collisions with helium, 7×105 Torr−1 sec−1 for argon, 2.5×106 Torr−1 sec−1 for CCl4, 15×105 Torr−1 sec−1 for O2, and 75×105 Torr−1 sec−1 for cyclohexane.