Isotopic thermal diffusion factors for chlorobenzene and bromobenzene were measured in a 45 cm liquid phase thermal diffusion column. The data, combined with results obtained earlier for deuterium and13C substituted benzenes, were interpreted in terms of differences in molecular masses and moments of inertia. The results for five isotopic pairs were represented within experimental accuracy by agr;T=1.973 (m1minus;m2)/(m1+m2)+0.973 (I1minus;I2)/(I1+I2), where agr;Tis the thermal diffusion factor,m1andm2are the molecular masses, andI1andI2are second moments.
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