EELS—See Electron energy loss spectroscopy

ELS Electron Energy Loss Spectroscopy Monoenergetic electrons 5-50 eV are scattered off a surface the energy losses are measured. This gives information on the electronic excitations of the surface and adsorbed molecules (see HREELS). Sometimes called EELS. 

Experiments have also been started that use the inelastic light scattering and include the methods of coherent anti-Stokes Raman spectroscopy (CARS), as well as electron energy loss spectroscopy (EELS). The methods (see, for instance, (4)(5)) are based on the application of various physical processes, as can be seen from their names. Accordingly they complement one another and enable us to study the elementary excitations of a surface over a wide range of energies and wave vectors. 

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