EXPLORING THE HELIUM (E, 2E) DIFFERENTIAL CROSS-SECTION AT 64.6 EV WITH SYMMETRICAL SCATTERING ANGLES BUT NONSYMMETRICAL ENERGIES

Helium (e, 2e) measurements are presented for an incident energy of 64.6 eV over a wide range of scattering angles from the coplanar to the perpendicular plane geometry. These measurements were taken for symmetric scattering angles and a range of detection energies from symmetric energy sharing where each electron has an excess energy of 20 eV to asymmetric sharing where the electrons have energies of 5 eV and 35 eV. A deep minimum observed for an electron gun angle of 67.5-degrees was explored as a function of this energy sharing.