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By W G Frankenberg

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The total expression should, therefore, be written as where D and E are, like C, constants depending on the nature of the atoms. The contribution by the second term of this equation may amount t o from 15 t o 30% of the first term, and in some cases this contribution may be even higher than that of the first term. In numerical calculations of adsorption energies, however, expression (7) is mostly used. It is assumed that the two last terms of Eq. (11) are counterbalanced by the contribution of the repulsion forces (see Sec.

4, and minimum E is higher than in Fig. 4. , by the difference between the ionization energy of the sodium atom and the electron affinity of the tungsten metal. As level E is still appreciably lower than level B [condition (31)], the atom will adsorb in an ionic form; the real change in potential energy connected with the mutual approach of the sodium atom and the tungsten surface being given by the line ASEF. If, by heating, the adsorbed ion is desorbed, line E S A will be followed and the ion desorbs in atomic form while drawing a n electron from the metal 42 J.

For the heat of adsorption of the atom, and D, denotes the dissociation energy of the molecule. [Compare D(H - H) in Eq. ] Calculated values of (Q,), can be easily derived from calculated values of Q. and the known values of D,. Trapnell (68) gives a survey of calculated and observed values of (&), for various gases on various metals. , the heat of adsorption on a bare surface. 9. Potential curves relating to the dissociative chemisorption of a molecule M (H2) on a metal Me without an activation energy, have to be compared with the calculated ones.

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