Increasing Surface Sensitivity in Electron Mossbauer Spectroscopy

3 INCREASING SURFACE SENSITIVITY IN ELECTRON MOSSBAUER SPECTROSCOPY 

The first situation necessarily implies the deposition of pure Fe films to obtain a measurable signal and ultrahigh-vacuum (UHV) conditions to ensure film purity. Submonolayer resolution can be attained with iCEMS. This subject, and its application to the study of surfece and internee magnetism, has been reviewed in detail [II]. 

Inthe second situation,theuseof ICEMSwould notgivethedesired resultssincethe information depth extendsuptoabout 330 nm and an important contribution from the substrate would maskthe contribution from the outermost layer. This is even observed with relatively thin samples. For example. Fig. 22.2(a) shows the ICEMS spectrum recorded from a 5 nm thick iron 

In the rest of the chapter, we will restrict all our descriptions and discussions to Fe, which is the naost common Mossbauer isotope. 

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