[en] The author describes an apparatus which allows to extend Conversion Electron Moessbauer Spectroscopy down to liquid helium temperature. The conversion electron detector operates under vacuum and makes use of a longitudinal field electron analyser. Moessbauer measurements at room temperature and 4.2 K made on thin films, 1000 A thick, of amorphous Fesub(x)Gesub(1-x) alloys are given. (Auth.)