Electron impact excitation and radiometric applications

The radiometric qualities of electron impact induced line radiation are discussed with emphasis on the spectral range of the vacuum ultraviolet. This is done in connection with a measurement of radiation losses from a fusion plasma, and with an investigation of electron impact induced double ionization of the Ar M shell. The excitation of He by highly charged ions is given as a third application. An appendix summarizes absolute cross sections for electron impact induced line emission, suited for a radiometric transfer standard. (orig.)