Near-infrared laser spectroscopy of TiS: The b1II-X3Δ transition

Abstract

Laser-induced fluorescence spectrum of TiS in the 769-863 nm region has been recorded and analyzed. The TiS molecule was produced using the technique of laser vaporization/reaction with supersonic cooling. Twenty-one weak subbands have been assigned as being due to b 1II-X 3, B 3II 0-X 3Δ 1, and C 3Δ-X 3Δ transitions. Strong evidence shows that the b 1II state is responsible for perturbing the v = 0, 1, and 2 levels of the C 3Δ 1 subband. The molecular constants of the b 1II state have been determined as follows: T e = 10 589.47 cm -1, ω e = 542.14 cm -1, ω ex e = 3.16 cm -1, B e = 0.19568 cm -1, and α e = 0.00085 cm -1. The spin-orbit interaction between the b 1II (v = 2 and 3) and C 3Δ (v = 1 and 2) levels is discussed in terms of configuration interaction occurring between the b 1II from the 11σ 1 5π 1 configuration and the 1II from the 5π 1 1δ 1 configuration, and the C 3Δ state from 12σ 1 1δ 1 configuration, © 2000 Academic Press.