dorsal/arxiv
View SchemaConstruction of Simulation Wavefunctions for Aqueous Species: D3O+
| Authors | M. A. Gomez, L. R. Pratt |
|---|---|
| Categories | |
| ArXiv ID | physics/9806035 |
| URL | https://arxiv.org/abs/physics/9806035 |
| DOI | 10.1063/1.477548 |
| Journal | Journal of Chemical Physics, 109, 8783 (1998) |
Abstract
This paper investigates Monte Carlo techniques for construction of compact wavefunctions for the internal atomic motion of the D3O+ ion. The polarization force field models of Stillinger, et al and of Ojamae, et al. were used. Initial pair product wavefunctions were obtained from the asymptotic high temperature many-body density matrix after contraction to atom pairs using Metropolis Monte Carlo. Subsequent characterization shows these pair product wavefunctions to be well optimized for atom pair correlations despite that fact that the predicted zero point energies are too high. The pair product wavefunctions are suitable to use within variational Monte Carlo, including excited states, and density matrix Monte Carlo calculations. Together with the pair product wavefunctions, the traditional variational theorem permits identification of wavefunction features with significant potential for further optimization. The most important explicit correlation variable found for the D3O+ ion was the vector triple product {\bf r}$_{OD1}\cdot$({\bf r}$_{OD2}\times${\bf r}$_{OD3}$). Variational Monte Carlo with 9 of such explicitly correlated functions yielded a ground state wavefunction with an error of 5-6% in the zero point energy.
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"abstract": "This paper investigates Monte Carlo techniques for construction of compact\nwavefunctions for the internal atomic motion of the D3O+ ion. The polarization\nforce field models of Stillinger, et al and of Ojamae, et al. were used.\nInitial pair product wavefunctions were obtained from the asymptotic high\ntemperature many-body density matrix after contraction to atom pairs using\nMetropolis Monte Carlo. Subsequent characterization shows these pair product\nwavefunctions to be well optimized for atom pair correlations despite that fact\nthat the predicted zero point energies are too high. The pair product\nwavefunctions are suitable to use within variational Monte Carlo, including\nexcited states, and density matrix Monte Carlo calculations. Together with the\npair product wavefunctions, the traditional variational theorem permits\nidentification of wavefunction features with significant potential for further\noptimization. The most important explicit correlation variable found for the\nD3O+ ion was the vector triple product {\\bf r}$_{OD1}\\cdot$({\\bf\nr}$_{OD2}\\times${\\bf r}$_{OD3}$). Variational Monte Carlo with 9 of such\nexplicitly correlated functions yielded a ground state wavefunction with an\nerror of 5-6% in the zero point energy.",
"arxiv_id": "physics/9806035",
"authors": [
"M. A. Gomez",
"L. R. Pratt"
],
"categories": [
"physics.class-ph",
"physics.atm-clus",
"physics.bio-ph"
],
"doi": "10.1063/1.477548",
"journal_ref": "Journal of Chemical Physics, 109, 8783 (1998)",
"title": "Construction of Simulation Wavefunctions for Aqueous Species: D3O+",
"url": "https://arxiv.org/abs/physics/9806035"
},
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