Abstract
The dissociation kinetic of NO on Rh(110) has been studied for temperatures ranging from 198 to 240 K and NO coverages ⩽ 0.3 ML. Auger lineshape analysis has been used to measure the amount of undissociated NO, θ NO, as a function of time, t, at a given reaction temperature. The constructed θ NO( t plots for different reaction temperatures showed that the initial dissociation rate obeys first-order kinetics with E a = 4.9 ± 0.4 kcal mol and v = 1 × 10 2.5 ± 0.5 s −1. The compositional and structural changes at various reaction temperatures, determined by parallel LEED and TPD measurements, were considered to explain the surprisingly low kinetic parameters we obtained.
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