Importance of non-first-order effects in the (e,3e) double ionization of helium
(2003) Physical review. A, Atomic, molecular, and optical physics — Vol. 67, n° 1 (2003)
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- Angular distributions of the two ejected electrons resulting from the double ionization of helium by electron impact have been measured by means of a multicoincidence multiangle (e,3e) spectrometer at an incident energy of about 0.6 keV and equal outgoing energies E-b=E-c=11 eV. We identify various regimes of kinematical parameters where substantial differences are found with respect to the first-Born convergent close-coupling calculations: an angular shift of the position of the main lobe and the presence of additional lobes. These differences are attributed to high-order contributions in the projectile-target interaction. This conclusion is supported by recent (e,3e) calculations performed within the second-Born approximation.
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Citations
Lahmam-Bennani, A., Duguet, A., Dal Cappello, C., Nebdi, H., & Piraux, B. (2003). Importance of non-first-order effects in the (e,3e) double ionization of helium. Physical review. A, Atomic, molecular, and optical physics, 67(1). https://doi.org/10.1103/PhysRevA.67.010701 (Original work published 2003)