Collisions between metastable O(5S) atoms and rare gases in the velocity range 1-10 x 105 cm s-1

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Abstract
Collisions between metastable O(5S) atoms and rare-gas atoms were studied in the energy range from 0.1 eV to about 10 eV. The use of a beam-attenuation technique yielded total cross sections for O(5S) in Ne, Ar, Kr, and Xe. Sensitised fluorescence was observed near the thresholds for production of excited O(3S), Kr(3P1), Xe(1P1) and Xe(3P1). No sensitised fluorescence was observed in the lighter rare gases, Ne and Ar. Total cross sections for O(5S) attenuation were obtained as functions of velocity by pulsing the metastable source and using appropriate time-of-flight techniques.