Average Energy Loss per Ion Pair Formation by Photon and Electron Impact on Xenon between Threshold and 90 eV

The W value, defined as the average energy required to form an ion pair, has been measured for xenon for bombarding electrons in the energy range 0 to 50 eV and for photons of energy between 12 and 90 eV. The W values varied between 24 and 50 eV per ion pair for the incident electrons and between 12 and 32 eV per ion pair for the incident photons.