The laser-induced fluorescence spectrum of CoS between 15 200 and 19 000 cm^-1

Laser-induced fluorescence excitation spectra of jet-cooled CoS molecules have been recordedin the energy range of 15200～19000 cm^-1. Five transition progressions have been reportedfor the first time, the assignments of these progressions have been derived from a rotationalanalysis of vibronic bands and they are determined to be 15.58⁴Δ_7/2～X⁴Δ_7/2, 16.02⁴Δ_7/2～X⁴Δ_7/2, 16.50⁴Δ_7/2～X⁴Δ_7/2, 17.80⁴П_5/2～X⁴Δ_7/2, and 18.00⁴Δ_7/2～X⁴Δ_7/2transitions. In addition, under the supersonic jet condition the fluorescent lifetimes of these vibronic states were measured by exponentially fitting the fluorescence decay. Based on the observed spectra and the measured lifetimes of the vibronic states, the newly identified electronic states are discussed.