Chemical-state specificity in surface structure determination |
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Authors: | DP Woodruff |
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Institution: | (1) Physics Department, University of Warwick, Coventry CV4 7AL, UK (Fax: +44-24/7669-2016, E-mail: D.P.Woodruff@Warwick.ac.uk), UK |
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Abstract: | In the pursuit of an understanding of complex surfaces, the problem of obtaining quantitative structural information about
local adsorbate geometry is especially difficult. Conventional diffraction methods rely on long-range order of the adsorbed
species, rarely present in complex coadsorption systems. Elementally specific local structural probes can help, but ultimately
one also requires chemical-state specificity. This can be achieved in structural methods that involve detection of photoelectrons
through the well-known ‘chemical shifts’ in core-level photoelectron binding energies; specific methods of this type are scanned-energy
mode photoelectron diffraction (PhD) and normal-incidence X-ray standing waves (NISXW). Recent examples of chemical-shift
PhD and NIXSW applications to complex coadsorption systems and to larger molecular adsorbates demonstrate this potential.
Received: 28 April 2000 / Accepted: 6 June 2000 / Published online: 7 March 2001 |
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Keywords: | PACS: 68 35 Bs 61 10 -i 82 65 -i |
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