Laser-induced fluorescence spectroscopy of CrS

CrS molecules were produced in a supersonic free jet expansion by reacting laser ablated chromium atoms and carbon disulfide. High-resolution laser-induced fluorescence spectrum between 625 and 825 nm was recorded. Six bands have been observed, which display the rotational structure of a Ω′=−1 ← Ω″=−1 transition. Isotopic displacement analysis of 52CrS and 53CrS confirms that these six bands form a vibrational progression in a single band system. Ab initio calculations yielded spectroscopic properties of the two low-lying 5Π states: X5Π(11σ15π11δ2) and B5Π(12σ15π11δ2). From the good agreement between calculated and measured spectroscopic properties, we assign the observed transition as the B5Π−1–X5Π−1.