The document discusses the Auger process and Auger electron spectroscopy (AES) technique. It explains that the Auger process involves ejection of an inner shell electron by an incoming electron, followed by relaxation through emission of an Auger electron. AES can be used to identify elements on a sample surface through measurement of the kinetic energies of emitted Auger electrons. It also allows for elemental mapping, depth profiling, and quantification of elemental composition.