The radiative lifetime of the blue

transition of XeF has been measured to be 93 ± 5 ns by monitoring the exponentially decaying 460 nm emission following rapid electron impact dissociation of XeF
2. By varying the XeF
2partial pressure, the rate constant for quenching of XeF (

) by XeF
2was determined to be

cm
3. s
-1. Finally, knowledge of the XeF B and C state lifetimes yields a revised value of 610 ± 60 cm
-1for the

to

state energy defect.