By W G Frankenberg
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Extra info for Advances in Catalysis and Related Subjects, Volume 12
Redfield (46) has given a modified description of the saturation phenomena in solids which is in agreement with experimental observations. 2. Line Widths and Shapes A common source of the line width of the magnetic resonance abmrption of nuclei in solids is the distribution of local magnetic fields in the solid caused by the magnetic dipole moments of the nuclei. As shown in Fig. 4 the magnetic field produced by n magnetic dipole varies in both strength and direction at a fixed distance from the dipole.
This is also the value of A & if the delocalization energy is zero. , it seems that quite strong metallic-like surface bonds can be formed if the energy level of the valence electron on the foreign atom falls within the range of occupied levels in the crystal. We note that this disposition of the energy levels does not occur with hydrogen and the alkali metals. , and the hydrogen level is, of course, at -1 Ryd. Obviously, a very large positive delocalization energy would be involved in the formation of a metallic-like surface bond with this system.
30 T. B. GRIMLEY On the homopolar line between the A 6 and the CS regions, for example, the usual anionic chemisorption of the last section and the “unusual” cationic chemisorption of this section coalesce, and a homopolar bond is formed between the foreign atom and the lattice. One electron is lost from an impurity level for each foreign atom adsorbed, and this homopolar chemisorption is depletive. VI. Conclusion An attempt has been made to show how conventional molecular orbital theory can be applied to problem of chemisorption on solids.
Advances in Catalysis and Related Subjects, Volume 12 by W G Frankenberg