Measurements of double differential cross sections in electron impact ionization of helium and argon

Details Measurements of double differential cross sections in electron impact ionization of helium and argon Measurements of double differential cross sections in electron impact ionization of helium and argon

Jun 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971zphy..244..254e&link_type=abstract

Zeitschrift für Physik, Volume 244, Issue 3, pp.254-267

Physics

24

Scientific paper

Double differential cross sections (angular distributions and energy loss spectra) have been measured of electrons after ionizing electron collisions with helium at primary energies E 0 between 25 eV and about 260 eV and with argon at E 0=75, 150 and 200 eV. The spectra have been measured with an energy analyzing collector system of constant transmission. It was found that for high collision energies ( E 0≧ 80 eV) the outgoing electrons belong to one of the two energetically well separated groups, either the fast electrons, which are scattered mainly in forward direction or the slow electrons which are distributed isotropically into all angles. At low primary energies E 0 no separation into groups is possible. Several findings indicate the qualitative applicability of the binary collision model.

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