Journal
CHEMICAL PHYSICS LETTERS
Volume 491, Issue 1-3, Pages 1-10Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2010.03.025
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Funding
- National Science Foundation [CHE-0848233]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [848233] Funding Source: National Science Foundation
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We describe a full-dimensional, flexible potential energy surface for arbitrary numbers of water monomers built from ab initio 2- and 3-body potentials. These potentials are each permutationally invariant fits to roughly 30 000 electronic energies. Tests of these potentials are made against direct high-level ab initio results for the water dimer and trimer. An application to the hexamer ( prism isomer) is made along with a review of recent ab initio calculations of harmonic frequencies. One-mode quantum calculations of the OH-stretch fundamentals are done with these potentials and their accuracy is assessed by comparisons with coupled MULTIMODE calculations for the water dimer and trimer. Local-mode calculations of OH-stretch fundamentals are presented for the hexamer and decamer, where it appears that the bulk limit is being approached. A new local-monomer model is presented and tested for the water dimer and trimer. (C) 2010 Elsevier B.V. All rights reserved.
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