The adsorption of CO on Pd(100) studied by IR reflection absorption spectroscopy |
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| Affiliation: | 1. Mayo Clinic, Rochester, MN;2. Dana-Farber Cancer Institute, Boston, MA;1. Department of Physics, University of Shanghai for Science and Technology, Shanghai 200093, PR China;2. Department of Physics, University of Shanghai, Shanghai 200444, PR China;3. Department of Physics, Hangzhou Normal University, Hangzhou 310018, PR China;1. Department of Chemistry, Mannaniya College of Arts & Science, Pangode, Trivandrum 695608, India;2. Department of Chemistry, B.J.M. Govt. College, Chavara, Kollam 691583, India;1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;2. Leverhulme Centre for Innovative Catalysis, Department of Chemistry, University of Liverpool, Liverpool L69 3BX, UK;1. Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy, 93210 La Plaine Saint-Denis, France;2. Departamento de Física, Universidade Federal de Rondônia, Campus Ji-Paraná, Rondônia 76900-726, Brazil |
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| Abstract: | High resolution vibrational spectra of the C-O stretching region have been measured for the system CO/Pd(100) at temperatures between 80 and 340 K. LEED and flash desorption studies enabled the absolute coverage for each spectrum to be determined. The C-0 stretching frequency was found to shift linearly with coverage for the three adsorption temperatures 80, 200 and 300 K. At saturation coverage (θ ~ 0.8) the total shift is of the order of 100 cm−1. Experiments with 12CO /13CO mixtures showed that the contribution of vibrational coupling is ~ 35 cm−1 the rest being due to a static, partly chemical, lateral interaction. The apparent commensurate-incommensurate transition at θ = 0.5 has no significant influence on shift, width or intensity of the absorption band. |
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