Istituto dei materiali per l'elettronica ed il magnetismo     
Savio L., Giallombardo C., Vattuone L., Kokalj A., Rocca M. Oxygen interaction at Ag(511): from chemisorption to the initial stages of oxide formation. In: Journal of Physics-Condensed Matter, vol. 20 article n. 224006. SPECIAL SECTION CONTAINING PAPERS FROM THE PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON VIBRATIONS AT SURFACES (VAS 12) (ERICE, 20-26 JULY 2007). IOP, 2008.
We report here on a combined experimental and computational investigation of oxygen interaction with Ag(511), a vicinal surface of Ag(100) characterized by a high density of close-packed steps. The different adsorbed species, either molecular or dissociated, and their reactivity towards CO are characterized by vibrational and photoemission spectroscopy, while the possible adsorption sites are determined by density functional theory calculations. The initial phases of Ag2O nucleation are also observed; the role of step geometry in the oxide formation process is discussed in comparison with previous results for Ag(210).
URL: http://www.iop.org/EJ/abstract/0953-8984/20/22/224006/
DOI: 10.1088/0953-8984/20/22/224006
Subject Adsorption, oxygen, vibrational spectroscopy, defects

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