Title: Cross Second Virial Coefficient of the H₂O–CO System from a New Ab Initio Pair Potential
Authors: Hellmann, Robert 
Language: eng
Keywords: Carbon monoxide;Potential energy surface;Second virial coefficient;Water
Issue Date: 1-Feb-2022
Document Type: Article
Journal / Series / Working Paper (HSU): International Journal of Thermophysics
Volume: 43
Abstract: 
The cross second virial coefficient B12 for the interaction between water (H₂O) and carbon monoxide (CO) was obtained with low uncertainty at temperatures from 200 K to 2000 K employing a new intermolecular potential energy surface (PES) for the H₂O–CO system. This PES was fitted to interaction energies determined for about 58 000 H₂O–CO configurations using high-level quantum-chemical ab initio methods up to coupled cluster with single, double, and perturbative triple excitations [CCSD(T)]. The cross second virial coefficient B12 was extracted from the PES using a semiclassical approach. An accurate correlation of the calculated B12 values was used to determine the dilute gas cross isothermal Joule–Thomson coefficient, ϕ12= B12- T(d B12/ d T). The predicted values for both B12 and ϕ12 agree reasonably well with the few existing experimental data and older calculated values and should be the most accurate estimates of these quantities to date.
Organization Units (connected with the publication): Thermodynamik 
ISSN: 0195928X
Publisher DOI: 10.1007/s10765-021-02948-0
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