Observation of an unusually low CO stretching frequency: CO chemisorption on a Mo(100) surface
1985; Elsevier BV; Volume: 121; Issue: 4-5 Linguagem: Inglês
10.1016/0009-2614(85)87214-6
ISSN1873-4448
AutoresFrancisco Zaera, E. B. Kollin, John L. Gland,
Tópico(s)Catalysis and Oxidation Reactions
ResumoAn unusual CO chemisorption state has been identified on the Mo(100) surface using high-resolution electron energy loss spectroscopy. X-ray photoemission spectroscopy, and thermal desorption spectroscopy. This state, which exists at low coverages and temperatures below 230 K, is characterized by two CO stretching frequencies at 1065 and 1235 cm−1, the lowest reported for any CO chemisorption system to date. We propose a bent adsorption geometry for this unique CO state that is the precursor for molecular dissociation on the Mo(100) surface beginning at 230 K. At higher coverages additional CO molecules bond perpendicularly to the metal surface with stretching frequencies near 2100 cm−1.
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