STRUCTURAL STUDIES OF MOLECULAR ADSORPTION AT SURFACES USING SCANNED-ENERGY MODE PHOTOELECTRON DIFFRACTION

D.P. Woodruff
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D.P. Woodruff: Physics Department, University of Warwick, Coventry CV4 7AL, UK

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 457-464

Abstract: A short review is presented of the use of scanned-energy mode photoelectron diffraction for the quantitative determination of the local adsorption structure of molecular species on wellcharacterised metal surfaces. Some of the results [notably for NO and CO adsorption on Ni(111)] highlight the importance of such true quantitative methods relative to "fingerprinting" via vibrational spectroscopy which is shown to have led to incorrect local adsorption site assignments. The use of direct methods for approximate site identification, and chemical-shift photoelectron diffraction for studies of more complex coadsorption structures is described with the aid of specific applications to molecular fragmentation and geometrical reaction path determination. The prognosis for further development and application is discussed.

Date: 1994
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DOI: 10.1142/S0218625X94000436

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