Tuning the Stoichiometry of Surface Oxide Phases by Step Morphology: Ag(511) versus Ag(210)

L. Savio, C. Giallombardo, L. Vattuone, A. Kokalj, and M. Rocca
Phys. Rev. Lett. 101, 266103 – Published 24 December 2008
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Abstract

We show by vibrational and photoemission spectroscopy and by ab initio calculations that in ultrahigh vacuum oxygen adsorption at stepped Ag surfaces causes the formation of surface oxide phases with different stoichiometry, depending on the morphology of the steps involved in the nucleation process. On Ag(511), characterized by close-packed steps and (100) terraces, subsurface O occupies tetrahedral interstitials and an Ag2O-like phase forms; on Ag(210), showing open step edges, subsurface oxygen ends up off center in octahedral sites and an AgO-like structure nucleates.

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  • Received 5 June 2007

DOI:https://doi.org/10.1103/PhysRevLett.101.266103

©2008 American Physical Society

Authors & Affiliations

L. Savio1,2,*, C. Giallombardo1,3, L. Vattuone1,3, A. Kokalj4, and M. Rocca1,2

  • 1Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
  • 2IMEM/CNR, Via Dodecaneso 33, 16146 Genova, Italy
  • 3CNISM Genova, Via Dodecaneso 33, 16146 Genova, Italy
  • 4Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia

  • *Corresponding author. savio@fisica.unige.it

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Issue

Vol. 101, Iss. 26 — 31 December 2008

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