Cover Image, Volume 36, Issue 9

The image depicts the efficacy of Unitary Group Adapted State‐Specific Multireference Perturbation Theory (UGA‐SSMRPT2) for computing in an intruder‐free manner the potential energy surface of “difficult” molecular states requiring a balanced inclusion of static and dynamic correlation. On page 670 (DOI: 10.1002/jcc.23851 ), Avijit Sen, Sangita Sen, Pradipta Kumar Samanta, and Debashis Mukherjee report the working equations are simple and incur low computational cost, yet are founded on sound physics involving a multireference starting function (CASSCF) and inclusion of dynamical correlation via perturbation, while maintaining the size extensivity and size‐consistency of the energy. The perturbative wave function is a spin‐eigenfunction due to the UGA formulation of the theory.