A new approach to the problem of electron-atom collision cross section measurements in the low-energy range

Momentum-transfer cross sections for He and Ar have been determined in the energy ranges 5×10-3-3 eV and 5×10-3-0.6 eV, respectively using a modified effective-range analysis of the shape of experimental ECR-absorption lines, registered in the afterglows. The following values have been obtained for the scattering length: 1.17±0.01a3 0 for He and 1.53±0.01a3 0 for Ar. © 1980.