Rotational analysis of a 1Σ+-1Σ+ system of gaseous SrS

Abstract

Red-degraded bands observed in absorption in the region 3600–3900 Å when strontium sulphide is heated in a carbon tube furnace to about 2000°C are assigned to a ¹Σ⁺–¹Σ⁺ system of SrS. The lower state is probably the ground state : the upper state is strongly perturbed. Constants derived from the analysis of five bands are : [graphic ommitted] With µ(⁸⁸Sr³²S)= 23.452 a.m.u., r_e(X¹Σ⁺)= 2.4405 Å. Ground-state properties of the diatomic oxides and sulphides of the group 2 metals are briefly compared.