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Quantitative structural study of the coadsorption of CO and K on Ni(111) using photoelectron diffraction
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UNSPECIFIED (1997) Quantitative structural study of the coadsorption of CO and K on Ni(111) using photoelectron diffraction. Surface Science, 393 (1-3). pp. 12-23. ISSN 0039-6028.
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Abstract
Scanned energy mode photoelectron diffraction measurements from the K 2p, O 1s and C 1s states of a Ni(111)(2 x 2)-K/nCO (n approximate to 2) coadsorption structure have been coupled with multiple scattering simulations to determine the local adsorption structure. This structure is compared with the structure of the Ni(111)c(4 x 2)-CO phase obtained from a similar analysis of C 1s and O 1s photoelectron diffraction data (which extends earlier work based on the C 1s signal alone), and of the structure of the Ni(111)(2x2)-K phase based on a previously-published analysis of K 2p and K 2s photoelectron diffraction. In the CO coadsorption phase the K atoms retain the atop site of the (2 x 2)-K phase but with a K-Ni bondlength increased by 0.15+/-0.05 Angstrom, and with the outermost Ni layer contraction of the (2 x 2)-K phase replaced by an outer layer expansion. The CO molecules occupy both types of hollow site on the surface with a C-Ni outermost layer spacing of approximately 1.30 Angstrom, but the inferred C-O bondlength shows no statistically significant change from its value in the absence of coadsorbed K. (C) 1997 Elsevier Science B.V.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | Surface Science | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0039-6028 | ||||
Official Date: | 10 December 1997 | ||||
Dates: |
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Volume: | 393 | ||||
Number: | 1-3 | ||||
Number of Pages: | 12 | ||||
Page Range: | pp. 12-23 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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