DIRECT-METHODS FOR ADSORBATE STRUCTURE DETERMINATION USING PHOTOELECTRON DIFFRACTION

We describe the application of two direct methods for the transformati on of scanned-energy mode photoelectron diffraction spectra which are capable of providing useful adsorption site identifications, and which form part of an integrated methodology for quantitative adsorbate str ucture determination. We draw some comparisons between the principles and proven success of this approach and that of 'photoelectron hologra phy'. Specific examples given include the adsorption sites of intact a nd partially reacted ammonia-derived species on Cu(110), the methoxy s pecies, CH3O-, on Ni(111), and the growth of Fe on Cu(111).