Semiclassical dispersion corrections efficiently improve multi-configurational quantum chemistry

Multi-configurational wave functions are known to describe electronic structure across a Born-Oppenheimer surface qualitatively correct. However, for quantitative reaction energies, dynamical correlation originating from the many configurations involving excitations out of the restricted orbital space, the active space, must be considered. Standard procedures involve approximations that eventually limit the ultimate accuracy achievable (most prominently, multi-reference perturbation theory). At the same time, the computational cost increase dramatically due to the necessity to obtain higher-order reduced density matrices. It is this disproportion that leads us here to propose a MC-srDFT-D hybrid approach of semiclassical dispersion (D) corrections to cover long-range dynamical correlation in a multi-configurational (MC) wave function theory which may include short-range (sr) dynamical correlation by density functional theory (DFT) without double counting. We demonstrate that the reliability of this approach is very good (at negligible cost), especially when considering that standard second-order multi-reference perturbation theory usually overestimates dispersion interactions.

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