期刊
JOURNAL OF CHEMICAL PHYSICS
卷 150, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5070138
关键词
-
资金
- Agency for Science, Technology and Research
- Engineering and Physical Science Research Council [EP/M506485/1]
- Royal Society
We develop a formalism to directly evaluate the matrix of force constants within a Quantum Monte Carlo calculation. We utilize the matrix of force constants to accurately relax the positions of atoms in molecules and determine their vibrational modes, using a combination of variational and diffusion Monte Carlo. The computed bond lengths differ by less than 0.007 A from the experimental results for all four tested molecules. For hydrogen and hydrogen chloride, we obtain fundamental vibrational frequencies within 0.1% of experimental results and 10 times more accurate than leading computational methods. For carbon dioxide and methane, the vibrational frequency obtained is on average within 1.1% of the experimental result, which is at least 3 times closer than results using restricted Hartree-Fock and density functional theory with a Perdew-Burke-Ernzerhof functional and comparable or better than density functional theory with a semi-empirical functional.
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