By W G Frankenberg
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Extra resources for Advances in Catalysis and Related Subjects, Volume 8
V,12). 2. Nonpolar van der Waals’ Forces on Conducting Surfaces The adsorption by nonpolar van der Waals’ forces on metal surfaces demands a separate treatment. Many attempts have been made t o consider the metal as an ideally polarizable structure. As Margenau and Pollard (31) pointed out, there is a serious objection against such a use of the so-called “image” picture. The inducing fields of the continually changing dipoles in a nonpolar molecule change so rapidly that the conduction electrons in the metal are incapable of following their movements.
Eley assumes th at the difference between pe-1 and pe-o will not be so large as t o disturb the calculation seriously. The calculation of the terms of Eq. /mole. The result is fantastically good in this example and it cannot be expected t o fit so closely in other cases. I n Table I1 we have given some calculated and observed values for D ( M - H ) for different metals M , as calculated by Eley; the observed value for Cu, however, has been obtained from more recent data (67). /Mole Metal D(M D(M - H) calc.
V,8,a) as the difference between level A (the atom) and the minimum E of curve DEF. The difference in energy between levels D and E is given mainly by Eq. (16), Sec. V,3, and is modified by contributions from van der Wads’ forces, polarization forces, and repulsive forces. /mole. /mole symbolizes the heat of adsorption of the atom in the form of where (QJi an ion. The heat of desorption is also given by the same difference between levels E and A and is, consequently, equal to the heat of adsorption; Qsd..