Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 13: Hauptvortrag

O 13.1: Invited Talk

Tuesday, March 28, 2000, 10:15–11:00, H36

Chemical-state specificity in surface structure determination — •D. Phil Woodruff — Physics Department, University of Warwick, Coventry CV4 7AL, UK

In the pursuit of an understanding of complex surfaces, the problems 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 which involve detection of photoelectrons through the well-known chemical shifts; 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.