Total forces in the diffusion Monte Carlo method with nonlocal pseudopotentials

Details Total forces in the diffusion Monte Carlo method with nonlocal pseudopotentials Total forces in the diffusion Monte Carlo method with nonlocal pseudopotentials

2008-07-08

arxiv.org/abs/0807.1204v2

Phys. Rev. B 78, 035134 (2008)

Physics

Condensed Matter

Materials Science

11 pages, 8 tables, 3 figures, spelling mistake corrected on page 3 (version 2)

Scientific paper

10.1103/PhysRevB.78.035134

We report exact expressions for atomic forces in the diffusion Monte Carlo (DMC) method when using nonlocal pseudopotentials. We present approximate schemes for estimating these expressions in both mixed and pure DMC calculations, including the pseudopotential Pulay term which has not previously been calculated and the Pulay nodal term which has not been calculated for real systems in pure DMC simulations. Harmonic vibrational frequencies and equilibrium bond lengths are derived from the DMC forces and compared with those obtained from DMC potential energy curves. Results for four small molecules show that the equilibrium bond lengths obtained from our best force and energy calculations differ by less than 0.002 Angstrom.

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