Rotational analysis of absorption bands of gaseous SeS

Abstract

Absorption bands of the gaseous SeS molecule have been observed using separated selenium isotopes 78SeS and 80SeS. Rotational analysis of bands in the region 3700 to 4300 AA shows that they arise from three sub-systems, B 0+, A 0+ from X 0+ and B 1 from X 1, in which the Omega =0+ and 1 sub-states of the states X and B are formed by the F1 and F2, F3 components respectively of 3 Sigma - states. The upper levels are all perturbed and there is a homogeneous interaction between A 0+ and B 0+. It has been possible to determine the vibrational numbering in the B-X system from the isotope effect between 78SeS and 80SeS.