Temperature effect on the collision-induced emission of S(1S) with He, Ar, N2, H2, Kr, and Xe

Abstract

Collision-induced emission from S(1S) has been studied in collisions with He, Ar, N2, H2, Kr, and Xe at 232 and 425°K. The S(1S) was made by OCS photodissociation at 157.7 nm. These results, in conjunction with an earlier study at 296°K, show the importance of bound molecules in the collision-induced emission with Xe—a dissociation energy of ?0.06 eV is estimated for the 2 1Σ+ potential of XeS [the potential arising from Xe+S(1S)]. Evidence for collision-induced emission from bound molecules is found for all except He. In contrast to the other gases, collision-induced emission is a minor process in the removal of S(1S) by hydrogen, accounting for only 0.36% of quenching collisions at 232°K decreasing to 0.12% at 425°K.