ELECTRONIC TO VIBRATIONAL ENERGY-TRANSFER FROM BR(42P1/2) TO H-2, HD, AND D-2

Electronic to vibrational energy transfer from Br*(*= 2P1/2) to H2, HD, and D2 has been monitored indirectly by observing subsequent vibrational to vibrational energy transfer from excited hydrogen to CO. From the decay of the Br* fluorescence at 2.71 μm following laser photolysis of Br2 we find the total deactivation rates of Br* by H2, HD, D2, and CO to be (8.66±1.00)×104, (2.07±0.10) ×105, (2.20±0.14)×104, and 348±18 sec-1 Torr-1, respectively. For mixtures of hydrogen and CO the amplitude of the CO fluorescence has been compared to the amplitude of the Br* fluorescence. The results indicate that the lower limit to the number of vibrational quanta excited per Br* deactivation is 0.60±0.11 for H2, 0.78±0.22 for HD, and 0.094±0.033 for D2. © 1979 American Institute of Physics.