  In this work we present the extension of semistochastic heat-bath
configuration interaction (SHCI) to work with any two-component and
four-component Hamiltonian. Vertical detachment energy (VDE) of AuH_2^- and
zero-field splitting (ZFS) of NpO2 2+ are calculated by correlating more than
100 spinors in both cases. This work demonstrates the capability of SHCI to
treat problems where both relativistic effect and electron correlation are
important.
