The determination of absolute anion formation cross sections from electron beam scattering data

摘要

Using recent low energy electron scattering data for CC1_4 and SF_6,and accompanying theory illustrating the coupling of attachment and elastic scattering,absolute cross sections are derived for electron attachment to CC1_4 and SF_6 between impact energies,respectively,of 8-52 meV and 7-42 meV.Values of attachment cross sections are compared with those obtained by laser and threshold photoionization techniques,which include normalization to rate coefficient data.Excellent agreement with the latest CC1_4 data is obtained,with less precise agreement for SF_6,but still lying within experimental uncertainties.