Electronic states and spectra of BiS

Abstract

NIR/VIS emission spectra of BiS were measured in the 5800–25 000 cm −1 region with a Fourier-transform spectrometer. BiS was produced by reaction of bismuth and sulfur vapor and excited by energy transfer from metastable oxygen O 2( a 1Δ g) in a fast-flow system. The spectrum of BiS was found to be closely related to that of the previously studied BiO radical [O. Shestakov et al., J. Mol. Spectrosc. 190 (1998) 28–77]. Five transitions connecting the Ω-components of the first three excited states, A 4Π( A 13/2, A 21/2), B 2Π( B 11/2), and C 4Σ −( C 11/2, C 23/2), with the components of the strongly split ground state, X 2Π( X 11/2, X 23/2, have been observed and analyzed.