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Radium compounds have attracted recently considerable attention due to bothdevelopment of experimental techniques for high-precision laser spectroscopy ofmolecules with short-lived nuclei and amenability of certain radium compoundsfor direct cooling with lasers. Currently, radium monofluoride (RaF) is one ofthe most studied molecules among the radium compounds, both theoretically andrecently also experimentally. Complementary studies of further diatomic radiumderivatives are highly desired to assess the influence of chemical substitutionon diverse molecular parameters, especially on those connected with lasercooling, such as vibronic transition probabilities, and those related toviolations of fundamental symmetries. In this article high-precision \emph{abinitio} studies of electronic and vibronic levels of diatomic radiummonochloride (RaCl) are presented. Recently developed approaches for treatingelectronic correlation with Fock-space coupled cluster methods are applied forthis purpose. Theoretical results are compared to an early experimentalinvestigation by Lagerqvist and used to partially reassign the experimentallyobserved transitions and molecular electronic levels of RaCl. Effectiveconstants of $\mathcal{P}$-odd hyperfine interaction $W_{\rm{a}}$ and$\mathcal{P,T}$-odd scalar-pseudoscalar nucleus-electron interaction$W_{\rm{s}}$ in the ground electronic state of RaCl are estimated within theframework of a quasirelativistic Zeroth-Order Regular Approximation approachand compared to parameters in RaF and RaOH.

Ab initio study and assignment of electronic states in molecular RaCl