  The semistochastic heat-bath configuration interaction (SHCI) method is a
selected configuration interaction plus perturbation theory method that has
provided near-full configuration interaction (FCI) levels of accuracy for many
systems with both single- and multi-reference character. However, obtaining
accurate energies in the complete basis set limit is hindered by the slow
convergence of the FCI energy with respect to basis size. Here we show that the
recently developed basis-set correction method based on range-separated
density-functional theory can be used to significantly speed up basis-set
convergence in SHCI calculations. In particular, we study two such schemes that
differ in the functional used, and apply them to transition metal atoms and
monoxides to obtain total, ionization, and dissociation energies well converged
to the complete-basis-set limit within chemical accuracy.
