Abstract
1. In a solid solution in CCl4, with low concentrations of CFCl3, the second moment M2 of the19F NMR line varies with the square of the concentration. The dependence is in quantitative agreement with the hypothesis that isolated pairs of CFCl3 molecules exist in the solution, analogous to what was found previously in a CFCl3 crystal, and this enables us to estimate the contribution of the Cl nuclei to M2. 2. At low coverages, the dependence of the second moment of the19F NMR lines in adsorbed CFCl3 is explained by nonuniformity of the silica gel surface. 3. Upon freezing liquid CFCl3, a special solid phase is formed in the space between the silica gel grains, for which the form of the NMR line is considerably different from that for the ordinary CFCl3 crystal, and the melting point is lower than for the ordinary crystal.
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