Abstract

XeF (Xv″) produced by KrF laser photodissociation of XeF2 is excited by photons of the same KrF laser pulse to XeF(D) and the fluorescence in the XeF (D–X) system is detected. The KrF laser excitation occurs primarily in the 7-1, 8-3, and 9-6 bands of the (D–X) system. The spectrally resolved fluorescence in the (D–X) system show the bound–bound band progressions originating in v′=7, 8, and 9 as well as Condon diffraction bands which result from transitions of XeF(D) into the dissociation continuum of ground state Xe+F. Model calculations for the bound-free transitions demonstrate that the observed diffraction bands are adequately described by transitions in the Dv′→Xfree system. For the vibrational levels v′=7, 8, and 9 they constitute about 70% of the total emission intensity. The quenching rate coefficient for XeF (Dv=9) in collisions with XeF2 is measured to be 5.7±0.8 10−10 cm3 s−1. The radiative lifetime of XeF (Dv=9) is found to be 19.1±0.5 ns.

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