Title: Cross Second Virial Coefficients of the H₂O-H₂ and H₂S-H₂ Systems from First-Principles
Authors: Hellmann, Robert 
Language: eng
Issue Date: 1-Jan-2023
Document Type: Article
Journal / Series / Working Paper (HSU): Journal of Chemical and Engineering Data
Volume: 68
Issue: 9
Page Start: 2212
Page End: 2222
The cross second virial coefficien B₁₂ for the interactions of water (H₂O) with molecular hydrogen (H₂) and of hydrogen sulfide (H₂S) with H₂ were obtained at temperatures in the range from 150 to 2000 K from new intermolecular potential energy surfaces (PESs) for the respective molecule pairs. The PESs are based on interaction energies determined for about 12 000 configurations of each molecule pair employing different high-level quantum-chemical ab initio methods up to coupled cluster with single, double, triple, and perturbative quadruple excitations [CCSDT(Q)]. Furthermore, the interaction energies were corrected for scalar relativistic effects. Both classical and semiclassical values for B₁₂ were extracted from the PESs using the Mayer-sampling Monte Carlo approach. While our results for the H₂O-H₂ system validate the older first-principles results of Hodges et al. [J. Chem. Phys. 2004, 120, 710-720], B₁₂ for the H₂S-H₂ system was, to the best of our knowledge, hitherto neither measured experimentally nor predicted from first principles.
Organization Units (connected with the publication): Thermodynamik 
ISSN: 1520-5134
Publisher DOI: 10.1021/acs.jced.3c00300
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