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Pentuple energy and angle differential cross sections for the electron-impact double ionization of helium

A previous time-dependent close-coupling method is modified and extended to calculate pentuple energy and angle differential cross sections for the electron-impact double ionization of helium. At an incident energy of 106 eV, we find reasonably good agreement between theory and scaled crossed-beam reaction microscope measurements for seven different cross sections. Integration of the differential cross sections over all energies and angles yields a total ionization cross section that is also in reasonable agreement with absolute crossed-beam measurements.