Adsorbates on Quasicrystals: Possibilities of short-range order investigation

Dr J.-T. Hoeft

(or: Adsorbates on Quasicrystals: Adsorption site determination with Photoelectron Diffraction)

The method of Photoelectron Diffraction has been developed over the past twenty years to a powerful tool for exploration of adsorption sites. In particular scanned-energy mode Photoelectron Diffraction (PhD) has been used to quantitatively determine a wide range of structures of adsorbates on ordinary, periodic crystals. The main features of PhD are the independence from long-range order and element-specificity coupled with the known evaluation procedures of quantitative LEED. The investigation of adsorbated atoms and molecules on aperiodic substrates now moves into perspective opening the big field of possible influences on the geometric and electronic structure of the substrates. This talk should illuminate the possibilities of successful application of PhD to adsorbates on quasicrystalline surfaces as well as its limits in

this field.