The isothermal dissociation rate of CCH and CH on Ni(111) was measured by following, with HREEL spectroscopy, the intensity of the CH stretching peak as a function of time. By repeating the experiment at several different temperatures we obtained an activation energy of 8 ± 3 kcal/mol for the CCH dissociation reaction and of 12 ± 3 kcal/mol for the CH dissociation reaction. Pre-exponential factors were found to be 103±1 s−1 in both cases. Independent thermal desorption spectra show a feature at 470 K and a tail extending up to 600 K. which can be assigned to the CCH dissociation and the CH dissociation respectively. The two experiments are quantitatively consistent.
Dissociation of CH species on Ni(111): A HREELS study
MORGANTE, ALBERTO;MODESTI, SILVIO;
1989-01-01
Abstract
The isothermal dissociation rate of CCH and CH on Ni(111) was measured by following, with HREEL spectroscopy, the intensity of the CH stretching peak as a function of time. By repeating the experiment at several different temperatures we obtained an activation energy of 8 ± 3 kcal/mol for the CCH dissociation reaction and of 12 ± 3 kcal/mol for the CH dissociation reaction. Pre-exponential factors were found to be 103±1 s−1 in both cases. Independent thermal desorption spectra show a feature at 470 K and a tail extending up to 600 K. which can be assigned to the CCH dissociation and the CH dissociation respectively. The two experiments are quantitatively consistent.Pubblicazioni consigliate
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