Configurational Effects in the Adsorption of HD on ZnO
NATIONAL BUREAU OF STANDARDS WASHINGTONDC SURFACE SCIENCE DIV
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Hydrogen deuterate, HD adsorption on ZnO surfaces has been studied by infrared spectroscopy as a function of ZnO temperature. It is shown that at 300K, the configuration ZnH-OD is preferred, as expected on thermodynamic grounds. As the temperature is lowered, the configuration ZnD-0H becomes preferred on kinetic grounds. We demonstrate that configuration reversal on heating must proceed via HD desorption and subsequent re-adsorption. This behavior is consistent with a model in which the transition state for HD adsorption is characterized by nearly complete dissociation of the H-D bond.
- Atomic and Molecular Physics and Spectroscopy