Knowledge Bank

Though the B - X system of $S2$ has been studied by many people, the upper $B3\Sigma u-$ state, being highly perturbed, still presents a few anomalies. Line intensities and line position anomalies in high resolution CW laser absorption measurements of the [8,1] band of the $B-X$ system are explained in terms of $B3\Sigma u--B\prime \prime 3\Pi u$ perturbations, using recent results of Matsumi et $al.1$ Approaches to deriving deperturbed constants for the B and $B\prime \prime$ states of of $S2$ will be discussed.