A single coupled-perturbed Kohn-Sham calculation replaces 6N DFT runs to obtain unbiased VMC forces that are more consistent with the potential energy surface and closer to CCSD(T) reference values than bare VMC forces.
For the VMC optimization for Cl 2 dimer ,cBN, and AcNH 2 test cases reported in Sec
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Fast Evaluation of Unbiased Atomic Forces in ab initio Variational Monte Carlo via the Lagrangian Technique
A single coupled-perturbed Kohn-Sham calculation replaces 6N DFT runs to obtain unbiased VMC forces that are more consistent with the potential energy surface and closer to CCSD(T) reference values than bare VMC forces.