Spectroscopy as discussed so far has been for electromagnetic radiation interacting with solids. According to the last chapter a beam of charged particles will also interact with the electronic system of the solid and will thus be subjected to an energy loss. This means energy transfer between the beam and the systems will take place and similar absorption and scattering spectra can be expected as described for the Raman effect and for optical absorption. In fact, spectroscopy with electrons extends the possible range of excitations dramatically. The much larger momentum of the electrons as compared to photons for the same energy enables not only the energy of the excitations but also their momentum to be measured. In addition, transport measurements for electrons or holes across junctions between two materials are an excellent method to obtain information on electron and even phonon densities of states. The two most important experimental techniques in this field are electron energy loss spectroscopy (EELS) and tunneling spectroscopy.
KeywordsFermi Energy Tunneling Junction Schottky Diode Electron Energy Loss Spectroscopy Tunneling Process
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Additional Reading Electron Energy Loss
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