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• W2043720297 abstract "Properties of copper condensed on selected areas of a thermally cleaned tungsten surface have been studied by probe hole field emission microscopy. Interpretation of the φhkl−gq relationship observed on (211), (111) and (310) for adsorption at T > 300 K is based on hardsphere models of the plane surfaces upon which the first monolayer of copper raises φithkl, the second reduces it to a minimum value, and the third achieves gfsat on each plane. At T > 300 K the relatively low binding energy of copper on (110) prevents is population below ∼2gq as previously observed for lead, and the plateaux in the φ110−gq curves are thought to result from the difficulty of nucleating the first and second monolayers of copper on (110). Comparison of our observations with those made by LEED/Auger techniques emphasise significant differences between the substrates used, in that, on field emitters (110) is step-free and surrounded by a sink/ source of adatoms, while the LEED specimen is stepped but has no comparable local sink/ source. The initial changes in φ are ascribed to formation of an adsorbate-substrate dipole whose sign and magnitude is controlled by electron equilibration between the substrate metal and a broadened and partly-filled resonance level lying approximately 5.2 eV below the vacuum level. Measurement of the total energy distribution of electrons field emitted from (110) and (132) supports this picture which contrasts with that of Polanski and Sidorski who consider the dipole sign and strength to be controlled principally by adsite geometry. Low activation energies characterise surface transport which is controlled by one-plane processes, and in some cases transport across the probed area is controlled by processes of relatively high activation energy which take place outside the examined plane." @default.
• W2043720297 created "2016-06-24" @default.
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• W2043720297 date "1977-12-01" @default.
• W2043720297 modified "2023-09-24" @default.
• W2043720297 title "Adsorption of copper on single crystal planes of tungsten" @default.
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• W2043720297 doi "https://doi.org/10.1016/0039-6028(77)90168-6" @default.
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