Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 10, Issue 12, Pages 5426-5435Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ct500860v
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Funding
- National Science Foundation [EPS-0903787, CHE-1156713]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1156713] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [0903787] Funding Source: National Science Foundation
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This work presents a systematic investigation into the basis set convergence of harmonic vibrational frequencies of (H2O)(2) and (HF)(2) computed with second-order Moller-Plesset perturbation theory (MP2) and the coupled-cluster singles and doubles method with perturbative connected triples, CCSD(T), while employing correlation-consistent basis sets as large as aug-cc-pV6Z. The harmonic vibrational frequencies presented here are expected to lie within a few cm-1 of the complete basis set (CBS) limit. For these important hydrogen-bonding prototype systems, a basis set of at least quadruple-zeta quality augmented with diffuse functions is required to obtain harmonic vibrational frequencies within 10 cm(-1) of the CBS limit. In addition, second-order vibrational perturbation theory (VPT2) anharmonic corrections yield CCSD(T) vibrational frequencies in excellent agreement with experimental spectra, differing by no more than a few cm-1 for the intramonomer fundamental vibrations. D0 values predicted by CCSD(T) VPT2 computations with a quadruple-zeta basis set reproduce the experimental values of (HF)(2) and (H2O)(2) to within 2 and 21 cm(-1), respectively.
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