COLL 275 |
| Takahiro Kondo, Michel Malick Thiam, Hiroyuki S. Kato, and Maki Kawai. Surface Chemistry Laboratory, RIKEN, Institute of Chemical and Physical Research, 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan |
| The initial growth of water crystal to form a bilayer and multilayers on Ru(0001) has been studied by the infrared reflection absorption spectroscopy (IRAS) and the temperature programmed desorption (TPD). A characteristic vibrational spectrum for adsorbed D2O is observed in the lower coverage region (0.07-0.36BL) on Ru(0001) at 25K, where D2O should be isolated on the surface and relatively strongly bonded with substrate causing the suppression of diffusion. With the increase of D2O coverage, the hydrogen bond network is formed on the surface, resulting in the reduction of the bond strength between D2O and substrate. Free OD stretch mode has never been observed up to about 1BL coverage, clearly indicating that the hydrogen in water islands is not oriented towards vacuum. It is also found that even a small amount of dissociated D2O fragments (lower than 10%) in the bilayer on Ru(0001) disturb the bond strength between D2O and the substrate. |
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Vibrational Analyses of Dry and Wet Surfaces
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |