The Practical Way Experimental Low-Energy Electron Mossbauer Spectroscopy

4 THE PRACTICAL WAY EXPERIMENTAL LOW-ENERGY ELECTRON MOSSBAUER SPECTROSCOPY 

There are several v/ays to record a low-energy electron Mossbauer spectrum. Initial attempts used electrostatic energy analyzers to filter the electrons of the desired energy. This is indeed possible but it is rather costly and presents experimental difficulties. A more simple approach is to use a channeltron as electron detector and to apply a positive bias between the cone entrance of the channeltron and the sample. The detection efficiency of channeltrons for electrons with energies lower than 100 eV is small. They present a much higher detection efficiency for electrons with energies in 

Typical curve of channeltron detection efficiency with electron energy. 

ILEEMS spectra recorded at different bias voltages from a 5nm thick Fe film that is oxidized at the surface. 

Transmission, iCEMS, and iLEEMS spectra recorded from a sampie of acicuiar 7-Fe203 nanoparticies supported on a Be substrate. 

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