Hydrogen-graphite interaction: Experimental evidences of an adsorption barrier |
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Authors: | Aréou E Cartry G Layet J-M Angot T |
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Affiliation: | Laboratoire de Physique des Interactions Ioniques et Mole?culaires, UMR 6633 CNRS-Universite? de Provence, Centre de Saint-Je?ro^me, Case 241, Avenue de l'Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France. etienne.areou@etu.univ-provence.fr |
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Abstract: | The interaction of H atoms having relatively low average kinetic energy (~0.025 eV) with both perfectly clean and D-covered HOPG surfaces is investigated using high resolution electron energy loss spectroscopy. From this study we confirm, in a controlled fashion, the presence of the theoretically predicted adsorption barrier since no adsorption is detected for such H atoms on HOPG. Moreover, we demonstrate that the exposure of a D saturated HOPG surface to these H atoms results in the complete removal of adatoms, with no further adsorption despite the prediction of the adsorption barrier to vanish for H dimers in para configuration. Therefore, the recombinative abstraction mechanism which competes with the adsorption process is more efficient. |
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