Cross Second Virial Coefficients of the H₂O-H₂ and H₂S-H₂ Systems from First-Principles.

ABSTRACT: The cross second virial coefficients 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 extract

SUBMITTER: Hellmann R 

PROVIDER: S-EPMC10510380 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature