Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5424581 | Surface Science | 2009 | 9 Pages |
Abstract
The adsorption of l-cysteine and l-methionine amino acids on a chiral Cu{5Â 3Â 1} surface was investigated with high resolution X-ray photoelectron spectroscopy (XPS) and carbon K-edge near edge X-ray absorption fine structure (NEXAFS) Spectroscopy using synchrotron radiation. XPS shows that at 300Â K l-cysteine adsorbs through two oxygen, a nitrogen and a sulfur atom, in a four point 'quadrangular footprint', whereas l-methionine adsorbs through only two oxygen and a nitrogen atom in a 'triangular footprint'. NEXAFS was used to clarify the adsorption geometry of both molecules, which suggests a binding orientation to the top layer and second layer atoms in two different orientations associated with adsorption sites on {1Â 1Â 0} and {3Â 1Â 1} microfacets of the Cu{5Â 3Â 1} surface.
Keywords
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
L. Thomsen, M.T. Wharmby, D.P. Riley, G. Held, M.J. Gladys,