Journal
CHEMICAL PHYSICS LETTERS
Volume 504, Issue 1-3, Pages 95-99Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2011.01.039
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- Institute of Industrial Science (IIS) of the University of Tokyo
- CREST project
- Grants-in-Aid for Scientific Research [22350023] Funding Source: KAKEN
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The energy gradient of the second-order Moller-Plesset perturbation theory (MP2) has been implemented in conjunction with the fragment molecular orbital-based molecular dynamics (FMO-MD) method including up to three-body correction (FMO3). A hybrid integral-direct approach of both atomic and molecular orbital indices was utilized with parallelism for the gradient calculations. A droplet model consisting of 64 water molecules was then simulated with the 6-31G* basis set. The first peak position of O-O radial distribution function was evaluated to be 2.75 angstrom at the FMO3-MP2 level, whereas the corresponding Hartree-Fock (FMO3-HF) value was 2.89 angstrom. Comparison with an X-ray value of 2.73 angstrom indicated better reliability of the MP2 gradient for FMO-MD. (C) 2011 Elsevier B. V. All rights reserved.
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