Abstract:
A second-order multireference perturbation theory, termed as IVO-SSMRPT which allows the use of
CASCI reference wave functions with improved virtual orbitals (IVO) for capturing static correlation
and state-specific parameterization of the state-universal electronic wave function in an attempt to
account for dynamic correlation has been utilized in an investigation of the torsional properties of ethylene, silaethylene, hydrogen peroxide, hydrazine, and oxalyl chloride. We also calculate the barrier to
inversion of ammonia. IVO-SSMRPT is robust and useful to scan energy surfaces as it avoids the
intruder-state problem, a troubling aspect of various established MRPT methods, without exploiting
level-shifting or increasing the size of the active space. We find that IVO-SSMRPT with the use of a relatively small active space and basis set can be compared with recent reference estimates which are reproduced within the expected precision indicating the method is useful for the study of rotation and
inversion barriers of challenging molecules.
