Abstract
Thermal desorption spectroscopy (TDS) has been used to study the coadsorption system, carbon monoxide and potassium, dosed at 120 K on a Ni(100) surface. Two CO desorption states are induced by predosed K. The lower temperature state, attributed to molecular desorption, shifts to higher temperatures with increasing K precoverage and to lower temperatures with increasing CO exposure. The intensity of the high temperature state, attributed to associative desorption of adsorbed C and O atoms, increases linearly with K coverage. Potassium desorption occurs simultaneously. Models involving long-range (indirect) K effects on adsorbed CO are supported.
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