Charge transfer effects on CO bond cleavage: CO and potassium on Fe(100)
In: Surface Science, Jg. 198 (1988), S. 315-330
Online
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Zugriff:
The effects of submonolayer coverages of potassium on CO chemisorption on the Fe(100) surface has been studied with TPD, XPS, and He I and He II UPS. Thermal desorption experiments show an increased capacity of the surface to hold dissociated CO and a lowering of the energy barrier to dissociation. The weakly bound molecular CO states (α1 and α2) showed increased activation energies for desorption with increasing potassium coverage. However, the more strongly bound π-CO state (α3) desorbs at a lower temperature with increasing potassium coverage. XPS data indicate that chemisorbed potassium on the clean Fe surface is bound in a semi-metallic state; not a fully ionic form. CO coadsorption partially oxidizes the chemisorbed potassium via a charge transfer mechanism. Potassium TPD data along with the K, C, O core level shifts demonstrate the formation of a KxO surface complex upon CO dissociation.
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Charge transfer effects on CO bond cleavage: CO and potassium on Fe(100)
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Autor/in / Beteiligte Person: | Dwyer, D.J. ; Cameron, S.D. |
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Zeitschrift: | Surface Science, Jg. 198 (1988), S. 315-330 |
Veröffentlichung: | Elsevier BV, 1988 |
Medientyp: | unknown |
ISSN: | 0039-6028 (print) |
DOI: | 10.1016/0039-6028(88)90371-8 |
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