The thermal diffusion factor of Ar-CO2 mixtures: new measurements and comparison with quantum calculations

New measurements for the thermal diffusion factor and for the diffusion coe fficient derived from it are reported for the Ar-CO2 gaseous mixture at dif ferent temperatures and for various concentrations of the CO2 molecule. Sev eral of the interaction potentials between the partners which have been sug gested in the literature;Ire examined, and quantum dynamics calculations ar e carried out to compare their performances using the infinite order sudden dynamic decoupling scheme. The present results are compared with other exp eriments and show clearly that, although one of the empirical potentials tu rns out to be the: most realistic for describing such properties, a unique form of a multiproperty-tested potential energy surface for this system is still lacking.