Analysis of the A Ω=1-X 3Σ0+- transition of PtS observed by intracavity laser spectroscopy with fourier transform detection (ILS-FTS), and computational studies of electronic states of PtS

The (0,0) and (1,0) vibrational bands of the A Omega = 1 - X-3 Sigma(-)(0+) transition of PtS have been observed in high resolution absorption measurements recorded using intracavity laser spectroscopy with Fourier transform detection (ILS-FTS). Hyperfine structure in 195 PtS lines was observed in the Q-branches only, due to the interaction of an unknown Omega = 0(-) state with the f levels of the A Omega = 1 state. The new (0,0) vibrational band has been rotationally analyzed and fit using PGOPHER. Results from the spectral analysis including deperturbation of the (0,0) band of the A Omega = 1 state are presented. Potential energy curves, spectroscopic constants, and transition dipole moments are presented for A-S and Omega electronic states with T-e < 25,000 cm(-1), based on high-level ab initio calculations. Experimentally observed electronic states of PtS are correlated to predicted states. (C) 2020 Elsevier B.V. All rights reserved.