Abstraction of D on Ag(1 0 0) and Ag(1 1 1) surfaces by gaseous H atoms: The role of electron–hole excitations in hot atom reactions and the transition to Eley–Rideal kinetics
作者： D. Kolovos-Vellianitis , J. Küppers
DOI: 10.1016/J.SUSC.2003.10.039
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摘要: Abstract H and D were adsorbed on Ag(1 0 0) Ag(1 1 1) surfaces characterized by thermal desorption spectroscopy. On hydrogen from surface sites at 150 K subsurface around 110 was observed. Similarly, of deuterium indicated bound D. only adsorption related near 160 monitored. Abstraction gaseous is affected reconstruction the HD kinetics exhibits a fluence (coverage) dependant cross-section. abstracted with strictly according to Eley–Rideal phenomenology. These features are close analogues those observed Cu(1 0 0) Cu(1 1 1) surfaces. A comparison abstraction various transition metals suggests that sticking hot atoms, reacting species surface, controlled electron–hole excitations. By this effect, in noble d-metals like Cu Ag small density states Fermi level probability for e–h excitation exhibit Due Ag–D bond energy attraction between incoming causes an increase cross-section low coverage, as recently predicted theory verified experiments graphite
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