Advances in Catalysis and Related Subjects, Volume 12 - download pdf or read online

By W G Frankenberg

ISBN-10: 0080565166

ISBN-13: 9780080565163

ISBN-10: 0120078120

ISBN-13: 9780120078127

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Extra info for Advances in Catalysis and Related Subjects, Volume 12

Example text

The chemisorption is therefore depletive because the surface coverage depends on the concentration of impurity levels in the solid. The semiconductivity is, of course, reduced. We assume that the interaction problem is between the orbital on the foreign atom and the conduction band of the solid. The usual picture is then found in the A 6 and A 6 C X regions of Fig. 7, provided that the 6 level lies below the impurity levels. An electron is lost from an impurity level for each foreign atom adsorbed, and if the 6 level is anionic, the foreign atom is converted to an anion on the surface.

C. METALLIC-LIKE BONDS If the interaction parameters fall in the forbidden region, no localized states are formed by the interaction between the foreign atom and the crystal. It does not follow, however, that strong binding of the foreign atom to the crystal is impossible. Binding can result simply because of a general lowering of the energies of the electrons in the system due to the altered boundary condition at the free surface caused by the presence of the foreign atom. All the electrons in the system contribute something to the surface bond, and since this situation is characteristic of the binding in the metals, such surface bonds are conveniently referred to a9 metallic-like.

And Stone, F. , Proc. Roy. Soc. 8197, 294 (1949). 16. O’Bryan, H. , and Skinner, H. W. , Proc. Roy. 8178, 229 (1940). Magnetic Resonance Techniques in Catalytic Research D. E. O’REILLY Gulf Research & Developmat Company, Pittsburgh, Pennsylvania Page 1. lntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 A. Nuclear Magnetic Resonance (NMR). . . . . . . . . . . . . . . . . 32 B. Electron Paramagnetic Resonance (EPR) . . . . .

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Advances in Catalysis and Related Subjects, Volume 12 by W G Frankenberg


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