Ab initio pair potential energy curve for the argon atom pair and thermophysical properties of the dilute argon gas. I. Argon-argon interatomic potential and rovibrational spectra
Publication date
2009-10-19
Document type
Research article
Author
Organisational unit
Universität Rostock
Scopus ID
Series or journal
Molecular Physics
Periodical volume
107
Periodical issue
20
First page
2181
Last page
2188
Peer-reviewed
✅
Part of the university bibliography
Nein
Language
English
Keyword
Argon ab initio pair potential
Argon analytical potential function
Rovibrational spectra
Abstract
An argon-argon interatomic potential energy curve was derived from quantum-mechanical ab initio calculations using basis sets of up to d-aug-cc-pV(6+d)Z quality supplemented with bond functions and ab initio methods up to CCSDT(Q). In addition, corrections for relativistic effects were determined. An analytical potential function was fitted to the ab initio values and utilised to compute the rovibrational spectrum. The quality of the interatomic potential function was tested by comparison of the calculated spectrum with experimental ones and those derived from other potentials of the literature. In a following paper the new interatomic potential is used to determine selected thermophysical properties of argon by means of quantum-statistical mechanics and the corresponding kinetic theory considering two-body and three-body interactions.
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Not applicable (or unknown)
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