Thermophysical properties of argon gas from improved two-body interaction potential

A new ab initio interaction potential for the electronic ground state of the argon dimer has been developed. The new potential uses previously calculated accurate Born--Oppenheimer potential while significantly improving the description of relativistic effects by including the two-electron Darwin an...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Lang, Jakub, Przybytek, Michal, Lesiuk, Michal
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 09.04.2024
Subjects
Acoustic properties
Argon
Destabilization
Dimers
Electromagnetic interactions
Energy of dissociation
Free energy
Heat of formation
Mathematical analysis
Quantum electrodynamics
Relativistic effects
Thermal conductivity
Thermophysical properties
Transport properties
Vibrational states
Virial coefficients
Online AccessGet full text

Cover

More Information
Summary:A new ab initio interaction potential for the electronic ground state of the argon dimer has been developed. The new potential uses previously calculated accurate Born--Oppenheimer potential while significantly improving the description of relativistic effects by including the two-electron Darwin and orbit-orbit corrections. Moreover, retardation of the electromagnetic interactions is taken into account in the long-range part of the potential and leading-order quantum electrodynamics correction is calculated. Spectroscopic properties of the argon dimer such as positions of vibrational levels, bond-dissociation energy, and rotational and centrifugal-distortion constants are reported. We show that the inclusion of the two-electron relativistic terms results in a destabilization of the previously discovered weakly bound ninth vibrational state. Finally, thermophysical properties of the argon gas including pressure and acoustic virial coefficients, as well as transport properties -- viscosity and thermal conductivity -- are evaluated using the new potential. For the thermophysical properties, the obtained ab initio values are somewhat less accurate than the most recent experimental results. However, the opposite is true for the transport properties, where the theoretical results calculated in this work have significantly smaller uncertainties than the data derived from measurements.
ISSN:2331-8422