XeF2 photodissociation studies. I. Quantum yields and kinetics of XeF(B) and XeF(C)

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Abstract
Photodissociation of XeF2 with synchrotron light pulses (0.3 ns duration) has been used as the source of the XeF(B, C, and D) excited states. The time-resolved profiles of the intensity of the resulting fluorescence have been recorded and partially analyzed. Most of the measurements were made in the strong XeF2 absorption band between 145 and 175 nm. The absorption cross section was redetermined out to 210 nm, with a maximum value of (5.9±0.5)×10−17 cm2 at 158 nm. By comparison with O(1S) signals from N2O photodissociation, quantum yields for XeF B, C, and D state production were determined. Radiative lifetimes of (14±1) and (100±10) ns were found for the B and C states. Rate coefficients for quenching by XeF2 are reported as are those for converting B to C by collision with Ne, Ar, and N2, along with upper limits for quenching of the C state by these gases.