Christof Hättig, Helena Larsen,
Jeppe Olsen, Poul Jørgensen
Department of Chemistry, Århus University, DK-8000 Århus C, Denmark
Department of Physical Chemistry, Faculty of Chemistry, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
Istituto di Chimica Quantistica ed Energetica Moleculare del Consiglio Nazionale delle Ricerche, I-56126 Pisa, Italy
J. Chem. Phys. 111, 10108-10118 (1999).
(Received 21 July 1999; accepted 16 September 1999)
The dielectric, refractivity, Kerr and hyperpolarizability second virial coefficients for the helium and argon gases are evaluated in a wide range of temperatures using a semi-classical approach and the high quality frequency-dependent interaction induced electric polarizabilities and second hyperpolarizabilities of the previous paper. For helium and argon we obtain satisfactory agreement with most of the experimental data for the dielectric and the refractivity second virial coefficients. Our results confirm that the helium gas second Kerr virial coefficient is very small at temperatures beyond 70 K. For argon we obtain a very good agreement with a recent experimental determination at 632.8 nm, whereas we suggest that previous experimental results for 458 nm might be inaccurate. The ESHG results indicate a possible disagreement between a recent experimental determination and the semi-classical ansatz for the second hyperpolarizability virial coefficients.
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