Abstract
The exchange of deuterium and hydrogen in ethylidyne and propylidyne on Pt(111) has been studied using temperature programmed desorption and secondary ion mass spectroscopy. Activation energies of near 7 kcal/mol characterize the initial rate of deuterium incorporation into both species. The exchange in ethylidyne is readily described by a sequential exchange model with equal exchange rates for each of the three deuterium atoms. In propylidyne, the situation is quite different in the following respects: (1) comparable incorporation rates require 100-fold higher D 2 pressures, and (2) incorporation rates are very nonuniform, some D being incorporated very rapidly and some H remaining unreacted even at very long D 2 exposures. Possible active exchange intermediates are discussed.
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