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- W3101703760 abstract "Atomic forces are calculated for first-row monohydrides and carbon monoxide within electronic quantum Monte Carlo (QMC). Accurate and efficient forces are achieved by using an improved method for moving variational parameters in variational QMC. Newton’s method with singular value decomposition (SVD) is combined with steepest-descent (SD) updates along directions rejected by the SVD, after initial SD steps. Dissociation energies in variational and diffusion QMC agree well with the experiment. The atomic forces agree quantitatively with potential-energy surfaces, demonstrating the accuracy of this force procedure. The harmonic vibrational frequencies and anharmonicity constants, derived from the QMC energies and atomic forces, also agree well with the experimental values." @default.
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- W3101703760 date "2005-06-22" @default.
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- W3101703760 title "Electronic quantum Monte Carlo calculations of atomic forces, vibrations, and anharmonicities" @default.
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- W3101703760 doi "https://doi.org/10.1063/1.1924690" @default.
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