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Scheme for adding electron–nucleus cusps to Gaussian orbitals

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number224322
<mark>Journal publication date</mark>2005
<mark>Journal</mark>Journal of Chemical Physics
Issue number22
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


A simple scheme is described for introducing the correct cusps at nuclei into orbitals obtained from Gaussian basis set electronic structure calculations. The scheme is tested with all-electron variational quantum Monte Carlo (VMC) and diffusion quantum Monte Carlo (DMC) methods for the Ne atom, the H2 molecule, and 55 molecules from a standard benchmark set. It greatly reduces the variance of the local energy in all cases and slightly improves the variational energy. This scheme yields a general improvement in the efficiency of all-electron VMC and DMC calculations using Gaussian basis sets.