PHOTOELECTRON HOLOGRAPHY STUDIES OF BI ON SI(111)

Photoelectron holography is applied to Bi atoms adsorbed on Si(111) fo r a determination of the three-dimensional atomic structure. Instead o f measuring the absolute intensity as a function of photon energy as i s traditionally done, a differential measurement is carried out to yie ld the logarithmic derivative of the intensity. This leads to intensit y self-normalization, and significantly improves the accuracy. The res ulting images show a well-resolved trimer structure for the adsorption geometry. (C) 1998 published by Elsevier Science B.V. All rights rese rved.