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Metastable Induced Electron Spectroscopy (MIES)

(Kopie 2)

In the case of Metastable Induced Electron Spectroscopy (MIES) long-lasting excited rare gas atoms interact with the surface of a solid. During this interaction, electrons are emitted as a result of electron exchange processes (auger processes), which take place at a distance ranging from approx. 3-10 Å in front of the surface. The electrons carry information regarding the electronic structure of the outermost atomic layer of the surface. The method is therefore one of the most surface-sensitive measurement methods. Because the gas atoms only have thermal energy, the atoms do not penetrate into the surface and therefore no sputtering processes that could alter the surface occur. The main rare gas used is helium, with a potential energy of 19.8 eV, as a result of which the electronic structure in the area of the valence band is mapped.  MIES is very well suited, firstly for the study of reactions of gases, such as oxygen, with solid surfaces, and secondly for the adsorption of organic molecules on surfaces. As a result of the high surface sensitivity, conclusions can even be drawn regarding the orientation of molecules.

 

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