Short time measurements of full-solid-angle Auger electron diffraction using a 180 degrees deflection toroidal analyzer

We have developed a 180 degrees deflection toroidal analyzer for photo- and Auger electron diffraction. Due to the simultaneous registration of the wi de range of polar angles in a given azimuth of the sample, measurements of photo- and Anger electron intensities over pi steradians can be performed r apidly by azimuthal rotation of the sample. In order to obtain the Auger el ectron diffraction data, it was necessary to measure the accurate energy di stribution on the detector. Thus, we have constructed a newly designed inpu t-lens-system, so that the energy resolution of the analyzer has been impro ved. Using this analyzer, some examples of full-solid-angle Auger electron diffraction (AED) patterns measured in short acquisition times were present ed. The AED patterns obtained were compared with theoretical ones calculate d by the multiple-scattering scheme. (C) 2001 Elsevier Science B.V. All rig hts reserved.