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The results of isotopic substitution in the adsorption of H2, D2, CH4, and CD4 on a graphitized carbon black observed by Constabaris, Sams, and Halsey are explained in terms of two competing effects: the quantum statistical mass effect on the vibrational energy levels normal to the surface and the quantum mechanical effect of isotopic substitution on the dispersion energy.
Yaris et al. (Wed,) studied this question.