A well-established problem in surface structure determination is the experimental difficulty in distinguishing a uniformly incommensurate structure from a domain wall structure. Surface extended x-ray absorption fine structure (SEXAFS), as a local structural probe, should provide an unambiguous means of making the distinction. We have studied chlorine adsorbed on Ag{110} by SEXAFS at several coverages. The Cl-Ag nearest-neighbor distance, 2.56 ± 0.04 A, is found to be substantially shorter than on the {111} and {100} faces, and is independent of coverage. At heta = 0.75 an incommensurate phase is formed. A multishell analysis (up to 5.6 A) allowed a complete structural determination and has, for the first time, confirmed our expectation. The CI-Cl spacing unambiguously favors a domain wall structure. Structural models have been tested by laser simulation experiments, and by kinematic analysis of the low-energy electron diffraction data.

Holmes, D.J., Panagiotides, N., Dus, R., Lamble, G.M., Barnes, C.J., Della Valle, F., et al. (1987). Discrimination between domain wall and uniformly incommensurate structures by surface extendex x-ray absorption fine structure: Absorption of chlorine on Ag{100}. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY. A. VACUUM, SURFACES, AND FILMS, 5(4), 703-707 [10.1116/1.574388].

Discrimination between domain wall and uniformly incommensurate structures by surface extendex x-ray absorption fine structure: Absorption of chlorine on Ag{100}

Della Valle, Federico;
1987-01-01

Abstract

A well-established problem in surface structure determination is the experimental difficulty in distinguishing a uniformly incommensurate structure from a domain wall structure. Surface extended x-ray absorption fine structure (SEXAFS), as a local structural probe, should provide an unambiguous means of making the distinction. We have studied chlorine adsorbed on Ag{110} by SEXAFS at several coverages. The Cl-Ag nearest-neighbor distance, 2.56 ± 0.04 A, is found to be substantially shorter than on the {111} and {100} faces, and is independent of coverage. At heta = 0.75 an incommensurate phase is formed. A multishell analysis (up to 5.6 A) allowed a complete structural determination and has, for the first time, confirmed our expectation. The CI-Cl spacing unambiguously favors a domain wall structure. Structural models have been tested by laser simulation experiments, and by kinematic analysis of the low-energy electron diffraction data.
1987
Holmes, D.J., Panagiotides, N., Dus, R., Lamble, G.M., Barnes, C.J., Della Valle, F., et al. (1987). Discrimination between domain wall and uniformly incommensurate structures by surface extendex x-ray absorption fine structure: Absorption of chlorine on Ag{100}. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY. A. VACUUM, SURFACES, AND FILMS, 5(4), 703-707 [10.1116/1.574388].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1035056