Streuung von 25 keVElektronen an Gasen
Abstract
The differential cross section of neon, argon, krypton, and xenon for the elastic scattering and for the excitation of optical transitions has been measured. For neon and argon the elastic angular distribution can be described by the cross section calculated according to Wentzel and Lenz. For krypton and xenon there are considerable deviations from the WentzelLenz cross section. In these cases it is better to calculate the elastic differential cross section from Slater eigenfunctions, from ThomasFermiDirac or from HartreeFock electron density distribution. The differential cross sections for the excitation of optical transitions, so far as measured here, obey for ϑ< ϑ _{ c } the dipol approximation, i.e. for angles not to small the inverse square angular dependence is valid. ϑ _{ c } is higher for the heavier rare gases. The oscillator strengths for some transitions have been determined from the scattering measurements in satisfactory agreement with theoretical values.
 Publication:

Zeitschrift fur Physik
 Pub Date:
 April 1964
 DOI:
 10.1007/BF01375330
 Bibcode:
 1964ZPhy..177..138G