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Journal Article

Structure determination of ammonia on Cu(110) — a low-symmetry adsorption site

MPS-Authors
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Hirschmugl,  C. J.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schindler,  Karl-Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schaff,  Oliver
Fritz Haber Institute, Max Planck Society;

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Fernandez,  V.
Fritz Haber Institute, Max Planck Society;

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Theobald,  Andreas
Fritz Haber Institute, Max Planck Society;

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Hofmann,  Philip
Fritz Haber Institute, Max Planck Society;

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Lindsay,  Robert
Fritz Haber Institute, Max Planck Society;

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Gießel,  Tatjana
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Baumgärtel,  Peter
Fritz Haber Institute, Max Planck Society;

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Bradshaw,  Alexander M.
Fritz Haber Institute, Max Planck Society;

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Citation

Booth, N., Davis, R., Toomes, R., Woodruff, D., Hirschmugl, C. J., Schindler, K.-M., et al. (1997). Structure determination of ammonia on Cu(110) — a low-symmetry adsorption site. Surface Science, 387(1-3), 152-159. doi:10.1016/S0039-6028(97)00280-X.


Cite as: https://hdl.handle.net/21.11116/0000-0008-7E8F-B
Abstract
The local adsorption structure of ammonia on Cu(110) has been determined in a quantitative fashion using N 1s scanned-energy mode photoelectron diffraction. While inversion of the photoelectron diffraction spectra using a direct method indicates that the adsorbed NH3 molecules are near to atop sites, a fuller multiple scattering analysis shows that the molecule is actually displaced 0.37 Å off the atop site in a 〈100〉 azimuth. The result is ascribed to adsorbate-adsorbate interactions (steric hindrance) similar to those found in (2 × 1)-CO (pmg) structures seen on several fcc (110) surfaces, although in the case of ammonia, it occurs at coverages well below saturation, implying that adsorbate-adsorbate attraction also occurs. These general conclusions are entirely consistent with those of a recent ESDIAD study of this system.