Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.38: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
A local structure determination of Uracil on Cu(110) by energy scanned photoelectron diffraction — David Duncan1, •Werner Unterberger2, Tsenolo Lerotholi1, Dagmar Kreikemeyer-Lorenzo2, and Phil Woodruff1 — 1University of Warwick — 2Frtiz-Haber-Institut
While there is growing interest in investigations of biologically-related molecules on surfaces, very few such studies involve quantitative determination of the local adsorption geometries. The technique of photoelectron diffraction (PhD) is particularly well-suited to this problem because it allows one to determine the local adsorption site of the molecule's atoms. Here we report the results of a new study, namely of the nucleobase molecule uracil (a six-membered ring comprising CH.CH.CO.NH.CO.NH) on Cu(110). The results for uracil, as one might expect, are closely similar to those reported previously for thymine [1]. Analysis of the O 1s and N 1s PhD spectra shows that the molecular plane is essentially perpendicular to the surface, and the molecule bonds to the surface through the two O atoms and the deprotonated N atom that lies between them. All three of these bonding atoms occupy near-atop sites on the Cu(110) surface, with the molecular plane twisted 11+-5° off of the <1-10> plane.
[1] F. Allegretti, M. Polcik, D.P. Woodruff, Surf. Sci. 601 (2007) 3611