Three new electronic transitions of CoS probed by LIF and DF spectroscopy

AbstractThe laser-induced fluorescence excitation spectrum of jet-cooled CoS molecules has been recorded in the energy range of 20 100–22 600cm−1. Twenty-one bands have been assigned as three transition progressions: [21.58] 4Φ9/2(υ′=0–2) – A4Φ9/2(υ″=0–3), [21.65] 4Δ7/2(υ′=0–1) – A4Φ9/2(υ″=0–2), and [21.73] 4Φ9/2(υ′=0–2) – A4Φ9/2(υ″=0–4). Spectroscopic constants for the three newly identified electronically excited states and the A state have been determined for the first time. The dispersed fluorescence spectra related to most of these bands have been investigated, vibrationally excited levels of the ground and the A state have been observed. In addition, the lifetimes for almost all the observed bands have also been measured