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Adsorption geometry of CN on Cu(1 1 1) and Cu(1 1 1)/O

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Polcik,  Martin
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kittel,  Martin
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Hoeft,  Jon Tobias
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Terborg,  Ralf
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Polcik, M., Kittel, M., Hoeft, J. T., Terborg, R., Toomes, R. L., & Woodruff, D. P. (2004). Adsorption geometry of CN on Cu(1 1 1) and Cu(1 1 1)/O. Surface Science, 563(1-3), 159-168. doi:10.1016/j.susc.2004.06.167.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0B86-E
Abstract
The adsorption geometry of CN on Cu(1 1 1), both with and without predosing with oxygen, has been investigated using N K-edge near-edge X-ray absorption fine structure (NEXAFS) and C 1s and N 1s scanned-energy mode photoelectron diffraction (PhD). The NEXAFS shows clearly that adsorbed onto clean Cu(1 1 1) the C–N axis is closely parallel to the surface, but in the presence of coadsorbed oxygen the average orientation has the axis tilted by 25° away from the surface; this confirms a much earlier report of an oxygen-induced reorientation of CN on this surface based on vibrational spectroscopy. The PhD data show very weak modulations which are rather insensitive to the emission geometry, clearly implying a high degree of disorder or a local adsorption site well-removed from any position of high point group symmetry. The best-fit structure corresponds to the CN lying slightly displaced from the three-fold coordinated hollow sites but with the C and N atoms having single Cu atom nearest neighbours at distances of 1.98 ± 0.05 and 2.00 ± 0.05 Å respectively.