Advances in Catalysis and Related Subjects, Volume 15 by W G Frankenberg

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This rate of decrease with increasing exposure is approximately the same for an ion-bombarded surface which has been well annealed as for one which has received a small anneal. However, the diffraction patterns from the gas-lattice structures on the surface with the small anneal are much more intense than those from the gas-lattice structures on the well-annealed surface because of the different defect densities in the two cases. If the extinction of the pattern from nickel were caused by the presence of the gas-lattice structures, one should expect a greater rate of extinction for the surface having a small anneal.

Metals. I n the interactions of gases, and particularly oxygen, with metal surfaces, one or more of the above three processes may be observed in order of increasing exposures (pressure x time). I n the initial process of adsorption, the gas, if diatomic, may remain on the surface in the form of (1) one or more layers in an amorphous molecular form, (2) a monolayer or less in which dissociated atoms occupy a two-dimensional lattice with the same atomic arrangement and spacing as those of the adsorbate or (3) with some larger spacing which is a simple multiple of this spacing.

Curve 2 : Typical beam, in the (001) azimuth a t about 58 volts, from the clean nickel lattice. Multiply the ordinate scale by 6. Curve 3 : Typical beam, in the (1TO) azimuth at about 17 volts, from a double-spaced, face-centered lattice. Curve 4 : Typical beam, in the (001) azimuth at about 27 volts, from a single-spaced, simple-square lattice. Multiply the ordinate scale by 2 . 10) azimuth at about 22 volts, from a nickel oxide lattice. ] 60 R. E. 5 0 C I -5 ^ - v I -4 Log,,(pressure x time) in mrn Hg-min Fra.

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