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An engery‐resolved electron stimulated desorption (ESD) study of oxygen‐exposed Ag (110)
Author(s) -
Corallo Gregory R.,
Hoflund Gar B.,
Outlaw Ronald A.
Publication year - 1988
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740120303
Subject(s) - desorption , oxygen , chemistry , hydrogen , activation energy , analytical chemistry (journal) , adsorption , environmental chemistry , organic chemistry
Energy‐resolved ESD data obtained from Ag(110) after exposure to oxygen at room temperature are presented. The oxygen is found to desorb predominantly as a hydroxyl species. The surface hydrogen apparently originates from the bulk silver and is only removed slowly over many sample anneals. OH + desorbs with an energy of 4.7 eV, and H + desorbs with an energy of 3.0 eV. The results suggest that oxygen adsorbs at two or more different bonding sites on this surface. OH + desorbs by ESD from the most prevalent of these sites, and O + desorbs from another site which seems to fill first upon oxygen exposure. The primary beam energy is an important ESD variable since exciting the Ag 3d core levels results in a substantial reduction in the OH + desorption yield.