High resolution studies of the b 1Σ+-X 3Σ- emission system of SeS

Publisher Website
Google Scholar
Abstract
The b 0+-X 1 0+ and b 0+-X 2 1 sub-systems of SeS have been recorded in emission in the near infrared with high resolution using a Bomem interferometer. The emission was excited by reacting ground state SeS molecules with metastable O2(1Δ g ) molecules. Rotational analyses have been carried out for the 0–0 bands of 80Se 32S, 78Se 32S, 82Se 32S, 76Se 32S and 77Se 32S and for the 1–0, 0–1, 1–2 and 0–2 bands of the more abundant isotopic species. Accurate molecular constants have been derived for the b 0+, X 1 0+ and X 2 1 states. The 0–0 band of 80Se 32S is of particular interest since 4 electric dipole and 3 magnetic dipole branches have been found. By fitting the line intensities to the line strength formulae of Watson, values have been found for the ratio of the parallel to perpendicular electric dipole transition moments as well as for the ratios of these quantities to the magnetic dipole transition moment.