Channeltron detecting system for conversion electron Moessbauer spectroscopy at high temperatures

A vacuum apparatus suitable for measurements of conversion electron Moessbauer spectra at temperatures up to 1200 K is presented. The apparatus allows CEMS measurements and in situ heat treatment of the samples under ultra-high vacuum conditions. The detecting system is based on the channel electron multiplier used in a closed-to-sample geometry. A special technique of suppressing the background due to thermally activated electrons and ions is described. Examples of measurements with a metallic iron foil above the Curie point and with crystals implanted with 57Fe ions are given. (orig.)