کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5396535 | 1392291 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoelectron spectroscopy for probing surface reactions at the CO/K/Cu(1Â 1Â 5) interface
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Photoelectron spectroscopy for probing surface reactions at the CO/K/Cu(1Â 1Â 5) interface Photoelectron spectroscopy for probing surface reactions at the CO/K/Cu(1Â 1Â 5) interface](/preview/png/5396535.png)
چکیده انگلیسی
The adsorption of carbon monoxide on the potassium modified Cu(1Â 1Â 5) surface was investigated using photoelectron spectroscopy based on synchrotron radiation. From detailed analysis of the 1s core levels in combination with existing knowledge, the assignment of surface species is performed. It is demonstrated that in dependence of the alkali coverage, several adsorption states of CO are present on the interface at 135Â K. From the temperature dependence of the C 1s and O 1s profiles it is established that surface reactions based on CO dissociation start from 223Â K over an interface with a potassium coverage close to half a complete K overlayer. The role of potassium as a reordering environment of adsorbed CO, leading to molecule dissociation and disproportionation is proposed. It is observed that a higher density of potassium on the substrate surface blocks adsorption sites for incoming CO molecules and no dissociation takes place.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 182, Issue 3, December 2010, Pages 127-133
Journal: Journal of Electron Spectroscopy and Related Phenomena - Volume 182, Issue 3, December 2010, Pages 127-133
نویسندگان
P.J. Godowski, S.V. Hoffmann, J. Onsgaard,