Direct atomic structure determination by scanned-energy photoelectron diffraction: Sb/GaAs(110)

Fourier transformation of experimental energy-dependent photoelectron diffr action (PED) data has been used to image independently the local structure of the two inequivalent adsorption sites of Sb at the GaAs(110)-p(1x1)Sb in terface. This approach is analogous to several recently developed direct me thods, even though it does not take into account the atomic scattering phas e shifts. Our results show that even this simple direct inversion is able t o provide the real-space images corresponding to the two inequivalent Sb ad atoms. The approximate structure obtained could be used as a starting point for a traditional 'trial and error' analysis, which refines and provides a n accurate surface structure. (C) 1999 Elsevier Science B.V. All rights res erved.