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Structure determination of PF3 adsorption on Cu(100) using X-ray standing waves
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Kariapper, M. S., Fisher, C. J., Woodruff, D. P., Chan, A. S. Y. and Jones, Robert G. (2008) Structure determination of PF3 adsorption on Cu(100) using X-ray standing waves. Surface Science, Vol.602 (No.2). pp. 650-659. doi:10.1016/j.susc.2007.11.025 ISSN 0039-6028.
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Official URL: http://dx.doi.org/10.1016/j.susc.2007.11.025
Abstract
The local structure of the Cu(100)c(4x2)-PF3 adsorption phase has been investigated through the use of normal-incidence X-ray standing waves (NIXSW), monitored by P 1s and F 1s photoemission, together with P K-edge near-edge X-ray absorption fine structure (NEXAFS). NEXAFS shows the molecule to be oriented with its C3v symmetry axis essentially perpendicular to the surface, while the P NIXSW data show the molecule to be adsorbed in atop sites 2.37±0.04 Å above the surface, this distance corresponding to the Cu-P nearest-neighbour distance in the absence of any surface relaxation. F NIXSW indicates a surprisingly small height difference of the P and F atoms above the surface 0.44±0.06 Å, compared with the value expected for an undistorted gas-phase geometry of 0.77 Å, implying significant increases in the F-P-F bond angles. In addition, however, the F NIXSW data indicate that the molecules have a well-defined azimuthal orientation with a molecular mirror plane aligned in a <011> substrate mirror plane, and with a small (5-10°) tilt of the molecule in this plane such that the two symmetrically-equivalent F atoms in each molecule are tilted down towards the surface.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | X-ray absorption near edge structure, Copper -- Absorption and adsorption, Phosphorus -- Absorption and adsorption, Chemisorption | ||||
Journal or Publication Title: | Surface Science | ||||
Publisher: | Elsevier BV | ||||
ISSN: | 0039-6028 | ||||
Official Date: | 15 January 2008 | ||||
Dates: |
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Volume: | Vol.602 | ||||
Number: | No.2 | ||||
Page Range: | pp. 650-659 | ||||
DOI: | 10.1016/j.susc.2007.11.025 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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