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• W1821013287 abstract "Ab initio calculations are reported for dimerization-induced changes, Δk, in the harmonic force constant k of the H-bonded OH in water dimer. Two dimer geometries are considered. Δk is obtained by considering the perturbation of a given monomer OH potential by the interaction energy in the dimer in question. The interaction energy is partitioned to identify the role of the various contributions to Δk. The sensitivity of Δk to the choice of the one-electron basis set is studied by using five different basis sets, some of which have a set of bond functions in the HO bond. At the correlated level, correction for basis set superposition error is found to be essential. A comparison is made of the correlation contribution to Δk as given by the CEPA1, MP2, MP3, and MP4 methods. Of these, MP2 gives exaggerated results. Nevertheless, for economical and reasonably accurate calculations on large systems the MP2 approach in the ESPB basis set is advocated. The most accurate calculations yield a shift Δv0-;1 of – 121 cm−1 for the uncoupled donor O-H vibrational frequency in water dimer." @default.
• W1821013287 created "2016-06-24" @default.
• W1821013287 creator A5037431353 @default.
• W1821013287 creator A5086191378 @default.
• W1821013287 date "1992-05-01" @default.
• W1821013287 modified "2023-09-28" @default.
• W1821013287 title "Methods for the calculation ofVoh in OH?O hydrogen bonds" @default.
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• W1821013287 doi "https://doi.org/10.1002/jcc.540130402" @default.
• W1821013287 hasPublicationYear "1992" @default.
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