| Autor: |
J.T. Yates, W.H. Weinberg, Patricia A. Thiel |
| Rok vydání: |
1979 |
| Předmět: |
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| Zdroj: |
Surface Science. 84:427-439 |
| ISSN: |
0039-6028 |
| DOI: |
10.1016/0039-6028(79)90146-8 |
| Popis: |
The chemisorption of H2 on the (111) surface of Rh has been studied using thermal desorption mass spectrometry and low-energy electron diffraction. No evidence for the formation of an ordered hydrogen overlayer has been detected between 100 and 400 K. Hydrogen adsorbs dissociatively following Langmuir [(1 − θ)2] adsorption kinetics. Thermal desorption spectra at all coverages suggest that a mobile precursor is involved in the desorption step. In the limit of zero coverage, E(2)d = 18.6 kcal/mole and v(2)0 = 1.2 × 10−3 cm2. No differences in H2 and D2 desorption kinetics are observed, suggesting that zero-point energy effects do not play a major role in determining desorption rates. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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