Spectrum of SO. Evidence for a new 3Δ state

Abstract

A rotational analysis has been carried out on the ³Π₁ and ³Π₀ sub-bands of the 1–0 band of the A³Π–X³Σ spectrum of SO obtained previously. A perturbation present on the v′= 1, J′= 15 level of the F₂(³Π₁) component of the A³Π state is shown to be consistent with that arising from interaction with a ³Δ state. Using calculations of Dixon et al., coupled with an empirical correction to the calculated term value of the ³Δ state, a crude potential is constructed which would cross the A state at v′= 1.