Spectroscopy of CrF: Rotational analysis of the B 6Π–X 6Σ+ band system in the 1.2 μm region

The B 6Π–X 6Σ+ band system of the CrF radical has been recorded in emission with FTS techniques in the region between 6965 and 9240 cm−1, using a resolution of 0.025 cm−1. A rotational analysis including the (0,0), (1,1), (1,0), (0,1) and (1,2) bands of this system has been carried out, and a set of molecular parameters has been derived for the B 6Π state. The present analysis has also resulted in substantially better determined values for the λ and γ parameters of the X 6Σ+ ground state. An improved set of molecular parameters has been derived for the previously analyzed, heavily perturbed A 6Σ+ state. The present analysis gives strong support for the interpretation that the local perturbations in the v=0–3 levels of A 6Σ+ are due to interactions with the vibrational levels v=3–6 of the B 6Π state. Earlier suggestions involving a low‐lying 4Π state as the dominating perturber of the A 6Σ+ state must now be considered as erroneous. A previously suggested interpretation of the 7400 cm−1 band as being possi...