High resolution laser spectroscopy of the [14.9] 4Σ− –X 4Σ− transition of jet-cooled CrP

The diatomic molecule, chromium monophosphide, has been studied by laser-induced fluorescence in a supersonic beam following laser-ablation of a chromium target in the presence of a small percentage of phosphine doped in helium. Two bands have been analyzed and were assigned as the 0–0 and 1–0 bands of the [14.9] 4Σ− –X 4Σ− electronic transition. An excited state value of Δ G ( 1 2 ) = 332.7341(16) cm−1 was obtained. From dispersed fluorescence, ground state values of ωe = 408.0 ± 2.6 cm−1 and ωexe = 2.2 ± 0.6 cm−1 were obtained. The two bands were found to be perturbed, particularly the 0–0 band, but a satisfactory rotational analysis yielded a well-determined set of molecular parameters.