Spectroscopy which utilizes this effect bombards a material with photons with energies between 2 and 50 kilo-electron-volts, which allows for component analysis of thin surfaces as electrons can only a short distance.  
The probability with which an atom may emit a fluorescent line photon, rather than exhibit this effect, is the fluorescent yield.  Spectroscopy which utilizes this effect bombards a material with photons with energies between 2 and 50 kilo-electron-volts, which allows for component analysis of thin surfaces as electrons can only a short distance.  FTP, name this effect also known as autoionization, in which light causes the ejection of a K-shell electron, named for a French physicist.
The probability with which an atom may emit a fluorescent line photon, rather than exhibit this effect, is the fluorescent yield.  
Auger effect (accept early autoionization)