Abstract
The kinetics of the conversion of ethylene to ethylidyne at the surface of Rh{111} has been studied using laser-induced desorption. Ethylene is desorbed intact into the gas phase when the surface is rapidly (∼ 10 10 K s -1) heated by a laser pulse, which provides a quantitative means of following the slow thermal conversion of ethylene to ethylidyne at the surface. This conversion was found to occur in the temperature range 170–240 K. Temperature-jump isothermal studies of the process were performed, and the results show coverage-dependent kinetics with product inhibition of the reaction due to an activation energy barrier which increases strongly with the amount of product formed.
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