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

By W G Frankenberg

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By W G Frankenberg

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The 1st NATO technological know-how discussion board used to be held in Biarritz in September 1990. This Taormina convention is the second one in a sequence that we want to be an extended one and that i think that it has equalled the good fortune of its predecessor. In establishing those conferences the NATO technological know-how Committee desired to assemble top specialists to study fields of sturdy current curiosity.

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J . Chem. Phys. 27, 1099 (1957). 30. , and Hulm, J. , J. Chem. Phys. 27, 1363 (1957). 31. , and Tompkins, F. , Trans. 56, 540 (1960). 32. , Trans. Paraday Soc. 59, 437 (1963). 33. L. , J . Chem. Phya. 14, 441 (1946). 34. Hickmott, T. , J . Phys. Chem. Solids 5 , 47 (1958). 35. Becker, J. , Becker, E. , and Brandes, R. , J. Appl. Phys. 32, 411 (1961). 36. Ehrlich, C . , in “Structure and Propertios of Thin Films” (C. A. Neugebauer, J. B. Newkirk, and D. A. ), p. 423. Wiley, New York, 1959). 37.

It is of considerable interest to learn if the surface structure of a cleaved crystal is similar to that of one cleaned by ion bombardment and annealing. An experiment of this type was first performed by Haneman (21) who made observations on the (0001) face of bismuth telluride. The results for the surfaces prepared by the two methods were 42 H. E. BARNSWORTH in agreement. However, as noted above, no deviations from the normal structure were observed for this crystal face. Hence a more significant experiment has been performed by comparing (111) surfaces of germanium prepared by the two methods (15, 23).

An experiment of this type was first performed by Haneman (21) who made observations on the (0001) face of bismuth telluride. The results for the surfaces prepared by the two methods were 42 H. E. BARNSWORTH in agreement. However, as noted above, no deviations from the normal structure were observed for this crystal face. Hence a more significant experiment has been performed by comparing (111) surfaces of germanium prepared by the two methods (15, 23). Although fractional order beams were observed for the cleaved ( 1 11) surface, there were appreciable differences in the intensity distributions for the two surfaces.

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