Probability density distribution energy spectrum

Energy spectrum probability density distribution function... 

Photoelectron spectroscopy provides a direct measure of the filled density of states of a solid. The kinetic energy distribution of the electrons that are emitted via the photoelectric effect when a sample is exposed to a monocluomatic ultraviolet (UV) or x-ray beam yields a photoelectron spectrum. Photoelectron spectroscopy not only provides the atomic composition, but also infonnation conceming the chemical enviromnent of the atoms in the near-surface region. Thus, it is probably the most popular and usefiil surface analysis teclmique. There are a number of fonus of photoelectron spectroscopy in conuuon use. 

An analysis of the electrons of CB prescribes their number as being evaluated from the density of electronic states g ( ), the analogue of Eq. (3.68), however multiplied by the probability that such a state to be occupied (according with Fermi distribution) and integrated after the energetic spectrum starting from the first energy of the conduction band... 

---