  Radium compounds have attracted recently considerable attention due to both
development of experimental techniques for high-precision laser spectroscopy of
molecules with short-lived nuclei and amenability of certain radium compounds
for direct cooling with lasers. Currently, radium monofluoride (RaF) is one of
the most studied molecules among the radium compounds, both theoretically and
recently also experimentally. Complementary studies of further diatomic radium
derivatives are highly desired to assess the influence of chemical substitution
on diverse molecular parameters, especially on those connected with laser
cooling, such as vibronic transition probabilities, and those related to
violations of fundamental symmetries. In this article high-precision \emph{ab
initio} studies of electronic and vibronic levels of diatomic radium
monochloride (RaCl) are presented. Recently developed approaches for treating
electronic correlation with Fock-space coupled cluster methods are applied for
this purpose. Theoretical results are compared to an early experimental
investigation by Lagerqvist and used to partially reassign the experimentally
observed transitions and molecular electronic levels of RaCl. Effective
constants 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 the
framework of a quasirelativistic Zeroth-Order Regular Approximation approach
and compared to parameters in RaF and RaOH.
