Electronic spectrum of gaseous BaS. Rotational analysis of bands of the A–X and B–X systems

Abstract

The rotational analysis of several bands of each of the two known systems of BaS has been completed. The ground state is X1Σ+ and the values of B″v derived enable values of the dipole moment to be obtained from measurements of µ2/B. µ0 is 10.863 ± 0.015 D. Other constants, in cm–1, are : [graphic omitted] There are small perturbations in state B, and state A is extensively perturbed; as in BaO, the interactions seem to be caused by at least one triplet state.