Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 132, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3367724
Keywords
ab initio calculations; bond lengths; fluorine; hydrogen bonds; isotope effects; molecular clusters; molecular configurations; Monte Carlo methods; water
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
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We propose an efficient path integral hybrid Monte Carlo (PIHMC) method based on fourth-order Trotter expansion. Here, the second-order effective force is employed to generate short trial trajectories to avoid computationally expensive Hessian matrix, while the final acceptance is judged based on fourth-order effective potential. The computational performance of our PIHMC scheme is compared with that of conventional PIHMC and PIMD methods based on second- and fourth-order Trotter expansions. Our method is applied to on-the-fly ab initio PIHMC calculation of fluoride ion-water complexes, F(-)(H(2)O) and F(-)(D(2)O), at ambient temperature, particularly focusing on the geometrical isotope effect.
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