Formation of the XeBr exciplex by Xe–Br2 (D′) collisions

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Abstract
Emission has been observed from the XeBr exciplex produced by collisional formation following sequential two-photon optical pumping of Br2 (D′). The vibrationally thermalized emission which results allows a study of the temperature dependence of the broadband XeBr III1/2→II1/2 fluorescence to be made. Calculated spectra based on ab initio potential curves confirm the band assignment and reproduce the observed temperature dependence. The collisional formation process has been determined to proceed with a rate constant of 1.7×10−10 s−1 cm3. An interpretation is given in terms of a harpooning mechanism.

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