A four-dimensional potential energy surface (PES) for the interaction between a rigid carbon dioxide molecule and a rigid nitrogen molecule was constructed based on quantum-chemical ab initio calculations up to the coupled-cluster level with single, double, and perturbative triple excitations. Interaction energies for a total of 1893 points on the PES were calculated using the counterpoise-corrected supermolecular approach and basis sets of up to quintuple-zeta quality with bond functions. The interaction energies were extrapolated to the complete basis set limit, and an analytical site–site potential function with seven sites for carbon dioxide and five sites for nitrogen was fitted to the interaction energies. The CO2—N2 cross second virial coefficient as well as the dilute gas shear viscosity, thermal conductivity, and binary diffusion coefficient of CO2—N2 mixtures were calculated for temperatures up to 2000 K to validate the PES and to provide reliable reference values for these important properties. The calculated values are in very good agreement with the best experimental data.
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7 June 2018
Research Article|
June 07 2018
Ab initio intermolecular potential energy surface for the CO2—N2 system and related thermophysical properties
Johann-Philipp Crusius
;
Johann-Philipp Crusius
1
Department of Earth Science and Engineering, Imperial College London
, London SW7 2AZ, United Kingdom
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Robert Hellmann
;
Robert Hellmann
a)
2
Institut für Chemie, Universität Rostock
, 18059 Rostock, Germany
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Juan Carlos Castro-Palacio;
Juan Carlos Castro-Palacio
1
Department of Earth Science and Engineering, Imperial College London
, London SW7 2AZ, United Kingdom
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Velisa Vesovic
Velisa Vesovic
1
Department of Earth Science and Engineering, Imperial College London
, London SW7 2AZ, United Kingdom
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a)
Electronic mail: [email protected]
J. Chem. Phys. 148, 214306 (2018)
Article history
Received:
April 10 2018
Accepted:
May 17 2018
Citation
Johann-Philipp Crusius, Robert Hellmann, Juan Carlos Castro-Palacio, Velisa Vesovic; Ab initio intermolecular potential energy surface for the CO2—N2 system and related thermophysical properties. J. Chem. Phys. 7 June 2018; 148 (21): 214306. https://doi.org/10.1063/1.5034347
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