Abstract
The isotope scrambling reaction of dihydrogen H 2 + D 2 → 2HD in the medium pressure range was investigated on a Ni(100) single crystal surface modified by sulfur. This reaction was completely suppressed by adding a 10 −6 part of dioxygen in the reactant, when the surface was covered by a hexagonal overlayer containing oxygen. The hexagonal overlayer reacted with hydrogen to form water. The lattice structure and thermal stability of this overlayer were examined by LEED, AES, TDS and a medium-pressure reaction cell.
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