near edge extended X-ray absorption fine structure (NEXAFS);
chemisorption;
copper;
zinc oxide;
carboxylic acid;
low index single crystal surfaces;
D O I:
10.1016/S0039-6028(00)01074-8
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The orientation of formic acid (HCOOH) on ZnO(000 (1) over bar)-O and the effect of co-adsorbed Cu have been studied using polarisation dependent C K-edge near edge X-ray absorption fine structure. Formate created by exposure of the substrate to 20 L of HCOOH at 110 K and heating to 340 K is tilted by 55 +/- 5 degrees with respect to the surface normal. Pre-absorbing Cu to create 2D islands covering about half the substrate results in an apparent tilt angle of 32 +/- 5 degrees with respect to the surface normal. Since this is dose to the magic angle, the apparent tilt could arise from a random orientation of the molecule, The origin of the apparent tilt is likely to be buckling of the Cu(110)-like islands. (C) 2001 Elsevier Science B.V. All rights reserved.
机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Lindsay, R
Gutiérrez-Sosa, A
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Gutiérrez-Sosa, A
Thornton, G
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Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, EnglandUniv Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Thornton, G
Ludviksson, A
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Ludviksson, A
Parker, S
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Parker, S
Campbell, CT
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
机构:
Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, EnglandUniv Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Thornton, G
Crook, S
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England
Crook, S
Chang, Z
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机构:Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England