Improved frequencies of rotational transitions of⁵²CrH in the ⁶Σ⁺ ground state

Previous mid-infrared, far-infrared, and new submillimeter data relating solely to ⁵²CrH in its X⁶Σ⁺ state have been reanalyzed by a least-squares fit using a Hund's case (b) Hamiltonian to determine the best obtainable set of parameters for the molecule. In particular, the fine structure and hyperfine constants have been improved. From these parameters, transition frequencies are determined that are more reliable than those published previously; the latter show systematic errors of up to 15 MHz. Such frequencies will facilitate the identification of CrH in the interstellar medium.