Hyperfine Interactions 58 (1990) 2519-2524

On the performance of UHV-ICEMS experiments

Zs. Kajcsos, Ch. Sauer, W. Zinn, R. Kurz, W. Meyer and M. A. C. Ligtenberg

Integral Conversion Electron Mössbauer Spectroscopy (ICEMS) when aimed at 
the study of clean surfaces in UHV often lead to unfavourable measuring 
geometry and consequently to long recording times. Possible means of 
shortening of the measuring times are analyzed. It is shown that criteria 
for experimental preferences may be distinctly different for different 
sample structures and for different kinds of electron detectors.
The experimental performance of a channeltron and a low-noise 
scintillation counter for UHV-ICEMS application is determined on base of 
measurements on different samples. It is demonstrated that for such 
experiments the channeltron provides the higher performance due to the 
substantial contribution of low energy (50-100 ev) electrons to the 
Mössbauer spectra.