Abstract
A recently designed refractometer employing the phenomenon of total internal reflection is used to measure the refractive indices of the condensed phases of the rare gases argon, krypton and xenon in the temperature ranges 35-90K, 60-117K and 30-178K, respectively. The values obtained for argon and xenon are in good agreement with those obtained by the method of minimum deviation, but values for krypton obtained by the two methods differ by more than the combined experimental error. This difference does not appear to be due to impurities. Experimental values of the refractive indices have been used to compute values of the Lorentz-Lorenz function for comparison with predictions arising from the theoretical models of C.J.F. Bottcher and of H. Block and S.M. Walker and to obtain revised values of the parameters for the theoretical treatment of S. Doniach and R. Huggins. The effect of vacancy concentration on density and hence on the Lorentz-Lorenz function is discussed.
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