By W G Frankenberg
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Extra resources for Advances in Catalysis and Related Subjects, Volume 15
E. 5 0 C I -5 ^ - v I -4 Log,,(pressure x time) in mrn Hg-min Fra. 9. Cuwes 1 and 2: Peak voltage for beam from nickel lattice versus log,, exposure (small anneal). Curve 3: Work function versus log,, exposure (small anneal). ] maximum and a subsequent rapid decrease. Although it is impossible to determine the exact exposure at which ‘p begins to decrease, this decrease occurs a t exposures too small for the formation of the oxide, as revealed by curve 3, Fig. 9. The results of more precise observations over a small range of exposure, in the region just preceding oxide formation are shown in Fig.
At 50 ev, the first monolayer contributes more than 75y0. Although gases have a lower atomic number than silver, and hence a lower scattering power, it is possible, nevertheless, to measure easily the diffraction pattern characteristic of a single gas monolayer (except hydrogen) on the surface of a solid if the gas atoms occupy a lattice somewhat different from that of the solid, as is usually the case ( 5 ) . If the gas atoms in the surface monolayer occupy the same lattice as that of the supporting crystal, it is possible to detect the presence of the gas atoms if the distance between the surface monolayer and the supporting atomic plane differs from that between two adjacent atomic planes (in the supporting solid) having the same Miller indices.
Although it is impossible to determine the exact exposure at which ‘p begins to decrease, this decrease occurs a t exposures too small for the formation of the oxide, as revealed by curve 3, Fig. 9. The results of more precise observations over a small range of exposure, in the region just preceding oxide formation are shown in Fig. 10. It is seen that ‘p is decreasing in the exposure range of the intense single-spaced, simple-square structure which just precedes the formation of the oxide structure.