UV and visible emission produced from S2Cl2 in the rare gas flowing afterglow

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Abstract
The energy transfer reactions of metastable Ar(3P0,2), Ne(3P0,2), and He(2 3S) atoms with S2Cl2 have been studied by optical spectroscopy in a flowing afterglow apparatus. In the Ar(3P0,2)+S2Cl2 reaction, ArCl*, S2(B–X), and Cl*2 emissions were observed, whereas S i and Cl*2 emissions were detected in the Ne(3P0,2)+S2Cl2 reaction. The He(2 3S)+S2Cl2 reaction produced a new extensive S+2 (A 2Πu–X 2Πg,r) emission in the 350–700 nm region, in addition to S i, Cl i, and Cl*2 emissions. Vibrational analysis of the S+2(A–X) band system provided molecular constants of the S+2(A, X) states. By using these constants, Morse potential Franck–Condon factors and r centroids of the S+2(A–X) transition have been calculated. The relative electronic transition moments and vibrational populations of S+2(A) have also been determined. The vibrational populations for 0⩽v′⩽6 were nearly exponential with an effective vibrational temperature of 1020±50 K.