AN APPARATUS FOR HIGH-RESOLUTION POSITRON-ANNIHILATION INDUCED AUGER-ELECTRON SPECTROSCOPY USING A TIME-OF-FLIGHT TECHNIQUE

An apparatus for high-resolution positron-annihilation induced Auger e lectron spectroscopy (PAES) has been constructed at the intense slow p ositron beam line of the Electrotechnical Laboratory. The system uses a short pulsed positron beam (similar to ns width) and the time-of-fli ght (TOF) method for the energy analysis of the Anger electrons. Ln or der to improve the energy resolution, an electrically isolated flight- tube is installed between a sample and a detector, and the electrons a re retarded by biasing the flight tube. This method makes it possible to measure high-resolution PAES spectra with high efficiency.