The water-oxygen dimer: first-principles calculation of an extrapolated potential energy surface and second virial
Richard J Wheatley1, Allan H Harvey
1School of Chemistry, The University of Nottingham, Nottingham NG7 2RD, United Kingdom. richard.wheatley@nottingham.ac.uk
Abstract:
The systematic intermolecular potential extrapolation routine (SIMPER) is applied to the water-oxygen complex to obtain a five-dimensional potential energy surface. This is the first application of SIMPER to open-shell molecules, and it is the first use, in this context, of asymptotic dispersion energy coefficients calculated using the unrestricted time-dependent coupled-cluster method. The potential energy surface is extrapolated to the complete basis set limit, fitted as a function of intermolecular geometry, and used to calculate (mixed) second virial coefficients, which significantly extend the range of the available experimental data.
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