Read X-ray photoelectron spectroscopy of oxygen adsorbates on Al(111): Theory experiment - Universitat de Barcelona; Bagus, Paul S.; Parmigiani, Fulvio; Polzonetti, G.; Illas i Riera, Francesc; Brundle, C. R. | ePub Online

American Institute of Physics 2012-05-07T22:11:54Z Genre/Form: info:eu-repo/semantics/article Material Type: Internet resource Document Type: Internet Resource, Archival Material All Authors / Contributors: Universitat de Barcelona; Bagus, Paul S.; Parmigiani, Fulvio; Polzonetti, G.; Illas i Riera, Francesc; Brundle, C. R. OCLC Number: 795577021 Language Note: English Abstract: We present the result of polar angle resolved x¿ray photoemission spectroscopy on Al(111)/O and cluster calculations of the O(1s) binding energy (BE) for various model situations. In the experimental data two O(1s) peaks are observed, separated by 1.3 eV. The angular behavior (depth¿resolution) could indicate that the lower BE peak is associated with an O atom under the surface, and the higher BE peak with an O atom above the surface. Equally, it could indicate oxygen islands on the surface where the perimeter atoms have a higher O(1s) BE than the interior atoms. The cluster calculations show that the former interpretation cannot be correct, since an O ads below the surface has a higher calculated O(1s) BE than one above. Cluster calculations simulating oxygen islands are, however, consistent with the experimental data.