Abstract
A rotor accelerated cross-beam system has been used to record the fluorescence spectrum of XeBr *, produced in the chemiluminescent reaction of Xe( 3P 0,2) with Br 2, and to monitor for the first time, its polarization as a function of reagent energy in the range, thermal ⩽ E t ⩽ 1.25 eV. The results establish (i) that the “primary” and “secondary” bands in the fluorescence spectrum are each associated with parallel polarization (i.e. with ΔΩ = 0); (ii) that the degree of polarization of “primary” band rapidly increases with the collision energy, approaching a limiting value appropriate to spectator stripping dynamics.
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