Abstract
The effect of potassium on the coadsorption of carbon monoxide and deuterium on Ni(100), with particular attention given to the low temperature Σ-CO and Σ-D 2 desorption states, has been studied by thermal desorption spectroscopy. Potassium shifts the Σ state peak temperatures to higher values and attenuates their intensities. The effects of potassium on the higher temperature carbon monoxide and deuterium desorption states are similar to the effects observed when one or the other is absorbed alone. A model is presented for the conversion of carbide to graphite on transition metal surfaces and for a possible role which potassium may play.
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