Abstract
Aluminum exhibits a large barrier of perhaps 1 eV to hydrogen dissociation. We have investigated the possibility of changing this barrie by various modifications of the aluminum surface. Pre-adsorbed oxygen does not alter the barrier significantly, potassium increases the barrier to some extent, whereas the evaporation of molybdenum atoms onto the aluminum surface generates sites with negligible barrier height to dissociation. In addition, we have observed changes in the sticking coefficients for atomic hydrogen on the modified aluminum surfaces: pre-adsorbed oxygen, for example, significantly reduces sticking.
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