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n addition to photoelectrons, Auger electrons can result during XPS measurements. a) Based on tabulated binding energies estimate the kinetic energy of Cu L3M2M2 Auger
n addition to photoelectrons, Auger electrons can result during XPS measurements. a) Based on tabulated binding energies estimate the kinetic energy of Cu L3M2M2 Auger electrons emitted via the three processes. b) In reality, it is not completely accurate to use the tabulated binding energies (which are for neutral atoms). Why not? Which energy (or energies) are incorrect? Does the calculation in (d) under- or over-estimate the Auger electron kinetic energy? c) An Auger electron of a certain type (e.g. KL1L2 in Au ) will exhibit the same kinetic energy regardless of how it was induced (such as by a lab XPS X-rays @1.5 keV, a hard X-ray beamline @10 keV, or a high-energy electron beam). Why is this true? And why are Auger peaks usually plotted on a Kinetic Energy scale, rather than a Binding Energy scale used for overall XPS spectra? d) Which element(s) will not exhibit the Auger electron emission phenomenon, and why? e) Consider the NaKLL Auger spectrum of NaCl shown below. After Auger emission, three possible final Na electronic configurations are: 2s02p6,2s12p5,&2s22p4. Draw arrows drawn on orbital energy schematics to show the transitions resulting in each different Auger electron type. Assign each to the peaks labeled A,B,C on the diagram. Notate each using Auger notation (KxLyLz)
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