PRESENTATION OF THE POSSIBILITIES OF ULTR AVACUUM SURFACE DIFFRACTIONON THE BEAMLINES OF THE EUROPEAN SYNCHROTRON-RADIATION FACILITY

After a brief introduction to the matter of X-rays diffraction at surf aces and interfaces we present in this paper an original and new equip ment recently built at the ESRF (European Synchrotron Radiation Facili ty) on beamline D32(CRG-IF i.e. Collaborating Reseach Group - Interfac e). This goniometer is equipped with an ultrahigh vacuum chamber, a sa mple transfer and an introduction system. It allows one to study the g rowth via grazing incidence X rays diffraction of in situ prepared sur faces and interfaces. Without giving all technical details we also dis cuss the improvement we have made on this apparatus in regard to previ ous ones. First results are also presented.