High-resolution spectra of BaS were recorded using laser excitation spectroscopy. BaS molecules were synthesized in a Broida-type oven. The observed rotationally-resolved spectrum of BaS in the 12 100-12 765 cm-1spectral range contains the 2-1, 3-1, 3-2, 4-2, 5-2, 5-3 vibrational bands of the A′1Π-X1Σ+transition and the 4-1, 5-1, 5-2 vibrational bands of the a3Π1-X1Σ+transition. Approximately 1000 lines of the A′1Π-X1Σ+transition and 600 lines of the a3Π1-X1Σ+transition for the main isotopologue138Ba32S (67.5% natural abundance) were measured. Rotational and vibrational parameters were derived for the A′1Π and a3Π1states. © 2011 Elsevier Inc. All rights reserved.
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