AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS1-TuA

Paper SS1-TuA6
Comprehensive Structural Analysis of H@sub 2@O/MgO(111) using DLD-LEED and IR Spectroscopy

Tuesday, November 4, 2003, 3:40 pm, Room 326

Session: Water at Interfaces II: Adsorbed Layers
Presenter: D.A. Human, University of Wisconsin-Milwaukee
Authors: D.A. Human, University of Wisconsin-Milwaukee
C.J. Hirschmugl, University of Wisconsin-Milwaukee
Correspondent: Click to Email
The polar MgO(111) surface is predicted to be charged, and may dissociate water molecules or reconstruct to minimize its energy. Structural analysis using a powerful combination of Low Energy Electron Diffraction (LEED) and UHV infrared spectroscopy provides new insights into this water/oxide interface. A pico-ampere LEED study reveals a @sr@3x@sr@3 R30° structure, and IR transmission spectroscopy suggests the presence of OH and H@sub 2@O species. To perform the LEED study, a new instrument incorporating a delay line detector has been constructed to rapidly collect high-quality digital LEED images with low total electron exposures, thus reducing incident beam effects. The characteristics of the new LEED instrument and the structure and species identification of monolayer and bilayer water coverages will be discussed.