Adsorption and dissociation of water on LaB6(100) investigated by surface vibrational spectroscopy |
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| Authors: | Thomas Yorisaki Aashani Tillekaratne Yuan Ren Yukihiro Moriya Chuhei Oshima Shigeki Otani Michael Trenary |
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| Institution: | 1. Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA;2. Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;3. Kagami Memorial Laboratory for Material Science and Technology, Waseda University, 2-8-26, Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan;4. National Institute for Material Science, 1-1 Namiki, Tsukuba-shi, Ibaraki 305-0044, Japan |
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| Abstract: | The chemisorption of water (H2O and D2O) on a LaB6(100) surface was studied with reflection absorption infrared spectroscopy (RAIRS) and high resolution electron energy loss spectroscopy (HREELS). The clean surface was exposed to H2O and D2O at temperatures from 90 K to room temperature, and spectra were acquired after heating to temperatures as high as 1200 K. It was found that water molecularly adsorbs on the surface at 90 K as a monomer at low coverages and as amorphous solid water at higher coverages. Water adsorbs dissociatively at room temperature to produce surface hydroxyl species as indicated by OH/OD stretch peaks at 3676/2701 cm?1. Room temperature adsorption also reveals low frequency loss features in HREEL spectra near 300 cm?1 that are quite similar to results obtained following the dissociative adsorption of O2. In the latter case, the loss features were attributed to the La O stretch of O atoms bridge-bonded between two La atoms. In the case of dissociative adsorption of H2O, the low frequency loss features could be due to either the LaO vibrations of adsorbed O or of adsorbed OH. |
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