Abstract
Tunable laser excitation followed by observation of infrared fluorescence provides a means of readily studying electronically excited photoproducts and their reactions. A number of specific examples involving the production of I*(52P1/2) and Br*(42P1/2) upon molecular photodissociation are considered. The quantum yield of I* production from HgI2 is obtained as a function of wavelength. An inconclusive search was made for unobserved states in IBr which lead to I* product atoms and for states of BrCl which lead to Br*. Photodissociation of CH2I2 in an intense laser field is observed to undergo multiphoton dissociation. Quenching and reactive collisions of Br* and I* with halogens, I2, Br2 and Cl2, and interhalogens, IBr, ICl and BrCl, are investigated. Electronically adiabatic reactive channels are detected for the collisions I*+ Br2→ IBr + Br* and I*+ IBr → I2+ Br*. Vibrationally excited HBr product molecules are observed in 10% of the quenching collisions of Br* with H2S.
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