AVS 52nd International Symposium
    Surface Science Monday Sessions
       Session SS2-MoA

Paper SS2-MoA1
Reconstrutions of the Polar Oxide Surface MgO(111)

Monday, October 31, 2005, 2:00 pm, Room 203

Session: Oxide Surfaces Structure and Reactivity
Presenter: S.E. Chamberlain, University of Wisconsin-Milwaukee
Authors: S.E. Chamberlain, University of Wisconsin-Milwaukee
D.A. Human, University of Wisconsin-Milwaukee
X.F. Hu, University of Wisconsin-Milwaukee
H.C. Poon, University of Wisconsin-Milwaukee
D.K. Saldin, University of Wisconsin-Milwaukee
C.J. Hirschmugl, University of Wisconsin-Milwaukee
Correspondent: Click to Email
Structures of polar oxide surfaces have been of great interest with several models proposed to compensate the "polar surface instability problem," including 1.) adsorption of foreign species, e.g., hydroxylated surface, 2.) surface faceting, 3.) metallization.@footnote 1@ MgO(111), the polar surface of a prototypical rocksalt structure, has been shown to maintain a 1x1 structure when annealed to low temperatures, and reconstruct when heated to higher temperatures,@footnote 2@ and thus represents an ideal system for detailed structural analysis. Detailed surface structures for the 1x1 and (@sr@3 x @sr@3)R30 ° reconstructions will be presented, which have recently been obtained with a novel, low-current LEED system. In good agreement with recent photoelectron diffraction and electronic structure calculations,@footnote 3@ the MgO(111)1x1 surface is mostly terminated with adsorbed OH groups mixed with a small percentage of O terminated patches with significant relaxation, and suggests that the hydroxylated surface is the compensation method of choice for MgO(111) 1x1. Results from the (@sr@3 x @sr@3)R30° reconstruction will be compared with several structures proposed in the literature.@footnote 2,4@ @FootnoteText@ @footnote 1@ C. Noguera, J. Phys.: Condens. Matter 12, R367 (2000)@footnote 2@ R. Plass, K. Egan, C. Collazo-Davila, D. Grozea, E. Landree, L. D. Marks, M. Gajdardziska-Josifovska, Phys. Rev. Lett. 81 (1998) 4891.@footnote 3@ V. K. Lazarov, R. Plass, H-C. Poon, D. K. Saldin, M. Weinert, S. A. Chambers, and M. Gajdardziska-Josifovska Phys. Rev. B 71, 115434 (2005)@footnote 4@ Subramanian A, Marks LD, Warschkow O, Ellis DE, Phys. Rev. Lett. 92 (2004)200411.