Abstract
Angular and energy distributions of ejected electrons in the direct and resonance He(e, 2e)He+ reactions are studied. It is shown that the first Born approximation (FBA) can be used to described ejected electron characteristics at incident energies E0>or=500 eV and ejection energies Eb<or=40 eV. It is also shown that the anisotropy of ejected electrons and the predominance of higher-order multipole terms are due to the peculiarities of the angular distributions of double-differential cross sections under different kinematical conditions. Under the conditions of FBA validity the profiles of the overlapping 1P and 1D autoionization resonances (AIR) in the ejection spectra of the He(e, 2e)He+ reaction are investigated by using the resonance structure of the angular coefficients. The resonance structure of the angular coefficients might provide more detailed information on the profiles and interaction mechanism of the 1P and 1D AIR at different multipoles L. Calculations carried out in the concrete structure model are compared with the available experimental data and theoretical estimates.
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