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    Surface Science Tuesday Sessions
       Session SS2-TuM

Paper SS2-TuM2
Water/MgO Interactions after High Temperature Annealing

Tuesday, October 30, 2001, 8:40 am, Room 122

Session: Water at Surfaces
Presenter: C.J. Hirschmugl, University of Wisconsin-Milwaukee
Authors: C.J. Hirschmugl, University of Wisconsin-Milwaukee
M. Harland, University of Wisconsin-Milwaukee
R. Plass, Sandia National Laboratories
K. Rewolinski, University of Wisconsin-Milwaukee
M. Gadjardziska-Josifovska, University of Wisconsin-Milwaukee
Correspondent: Click to Email
Infrared transmission measurements of MgO(100) and MgO(111) samples as a function of annealing (between 900-1500K) and exposure to air, reveal strikingly different absorption signatures. The measurements are taken 30 degrees from normal incidence to couple to vibrations of adsobates perpendicular and parallel to the surface. Previously, it has previously been surmised that MgO(111) samples annealed to 1500 K undergo a reconstruction at the surface, while MgO(100) does not undergo any similar reconstruction. Notably, the infrared absorption observed for both terminations of MgO(100) and (111) were similar. Samples annealed to 900 K show broad water absorption bands between 3400-3600 cm@super -1@, corresponding to a layer of hydrogen bonded water at the surface. However, this prominent feature disappeared for samples annealed to 1500 K, and a series of weak, sharper bands appeared over the same frequency range. An examination with D@sub 2@O will be used to identify the nature of the bands due to interaction between MgO and water.