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All-Dimensional H2-CO Potential: Validation with Fully Quantum Second Virial Coefficients



Giovanni Garberoglio, Piotr Jankowski, Krzysztof Szalewicz, Allan H. Harvey


We use a new high-accuracy all-dimensional potential to compute the cross second virial coefficient B12(T) between molecular hydrogen and carbon monoxide. The path-integral method is used to fully account for quantum effects. Values are calculated from 10 K to 2000 K and the uncertainty of the potential is propagated into uncertainties of B12. Our calculated B12T) are in excellent agreement with most of the limited experimental data available, but cover a much wider range of temperatures and have lower uncertainties. Similar to recently reported findings from scattering calculations, we find that the reduced-dimensionality potential obtained by averaging over the rovibrational motion of the monomers gives results that are a good approximation to those obtained when flexibility is fully taken into account. Also, the four- dimensional approximation with monomers taken at their vibrationally averaged separation works fairly well. This finding is important since full-dimensional potentials are difficult to develop even for triatomic monomers and are not currently possible to obtain for larger molecules.
Journal of Chemical Physics


carbon monoxide, hydrogen, intermolecular potential, second virial coefficient


Garberoglio, G. , Jankowski, P. , Szalewicz, K. and Harvey, A. (2017), All-Dimensional H2-CO Potential: Validation with Fully Quantum Second Virial Coefficients, Journal of Chemical Physics, [online],, (Accessed May 25, 2024)


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Created February 2, 2017, Updated October 12, 2021