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QUANTITATIVE STRUCTURAL STUDY OF AN NA-O COADSORPTION PHASE ON AL(111) USING X-RAY STANDING WAVES
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UNSPECIFIED (1995) QUANTITATIVE STRUCTURAL STUDY OF AN NA-O COADSORPTION PHASE ON AL(111) USING X-RAY STANDING WAVES. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 91 (20). pp. 3555-3561. ISSN 0956-5000.
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Abstract
Using normal-incidence X-ray standing wavefield absorption (NIXSW) including site triangulation via measurements at (111) and (($) over bar 111) reflections of both the O and Na X-ray absorption, we have investigated the local adsorption sites produced by O chemisorption onto a room-temperature-prepared Al(111)(root 3 x root 3)R30 degrees-Na surface. The structure of the pure alkali-metal phase has been shown previously, by SEXAFS and NIXSW, to involve Na substitution of top-layer Al atoms, and these sites are unchanged in the early stages of O chemisorption. The new NIXSW results indicate that in this stage the O atoms adsorb atop the Na atoms with an Na nu O spacing of ca. 2.05 Angstrom. This site provides a clear rationalisation for the results of Na and Al 2p core-fever spectroscopy which indicate that the dominant O bonding is to the Na atoms and not to the Al, as in O chemisorption on the clean Al(111) surface. An alternative interpretation of the NIXSW data based on adsorption to near-hcp hollow sites is difficult to reconcile with the very short Na nu O bond length associated with this site, and with the implied inequivalence of hcp and fee sites despite the local NavO bonding found in photoemission.
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: | JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | ||||
Publisher: | ROYAL SOC CHEMISTRY | ||||
ISSN: | 0956-5000 | ||||
Official Date: | 21 October 1995 | ||||
Dates: |
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Volume: | 91 | ||||
Number: | 20 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 3555-3561 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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