Kerr virial coefficient, polarizability

In the expressions (184) and (184b) the second, temperature-dependent term defines the Born effect due to superposition of the two non-linear processes of second-order distortion and reorientation of permanent dipole moments in the electric field. Buckingham et al. determined nonlinear polarizabflities If and c for numerous molecules by Kerr effect measurements in gases as a function of temperature and pressure. It is here convenient to use the virial expansion of the molar Kerr constant, when the first and second virial coefficients Ak and Bk result immediately from equations (177), (178), and (184). Meeten et al. determined nonlinear molecular polarizabilities by measuring K in liquids as a function of temperature. 

Fernandez et al calculated the frequency dependent interaction-induced second hyperpolarizability of two argon atoms. Subsequently, they evaluated the dielectric, the refractivity, the Kerr and the hyperpolarizability second virial coefficients. They obtained the interaction-induced mean and the anisotropy of the dipole polarizability and the mean second hyperpolarizability of Ai2 in the range of internuclear separations defined by 5 < R/ao < 30 at the CCSD level of theory, keeping the ten innermost MO frozen. They tested several basis sets at the experimental bond length of the argon dimer. Their final choice for the calculations was a d-aug-cc-pVTZ-33211 basis. 

Measurements. The anisotropy of the pair polarizability has been determined from three types of measurements depolarized CILS spectra, pressure dependent depolarization ratios, and second virial Kerr coefficients. 

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