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Vibrational spectra of CO and CO2 adsorbed on potassium modified Fe(100)
1989 (engelsk)Inngår i: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 224, nr 1-3, s. 348-358Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

High resolution electron energy loss (EEL) spectra for CO adsorbed on potassium modified Fe(100) are presented. Five CO vibrational bands are clearly distinguishable. Two bands at or above 2000 cm-1 correspond to the *1- and *2-states on the clean surface. Two more bands, residing between 1450 and 1850 cm-1, reveal adsorption at potassium modified sites. The response of these bands to changes in potassium coverage and annealing temperature is highly predictable and similar to the situation on Fe(111) [1]. This suggests a local K: CO coordination. A fifth band is observed around 950 cm-1 and interpreted as CO adsorbed at potassium modified *3-sites, redshifted from 1200 cm-1 at unmofidied sites. The present results are complementary to a previous study of the same adsorption system utilizing photoemission spectroscopy and thermal desorption spectroscopy [2]. Finally, we present novel vibrational and thermal desorption (TDS) data for Fe(100)/K exposed to CO2 and point at similarities between intermediate states following CO and CO2 adsorption on different potassium promoted iron surfaces.

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1989. Vol. 224, nr 1-3, s. 348-358
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URN: urn:nbn:se:ltu:diva-11808DOI: 10.1016/0039-6028(89)90919-9Lokal ID: ad193aa0-386f-11dd-8721-000ea68e967bOAI: oai:DiVA.org:ltu-11808DiVA, id: diva2:984758
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Upprättat; 1989; 20080612 (ysko)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2017-11-24bibliografisk kontrollert

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