Double ionization of helium by 2-keV electrons in equal- and unequal-energy configurations

D. M. MITNIK; G. GASANEO; M. J. AMBROSIO; L. U. ANCARANI; A. DORN

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Lugar: New York; Año: 2016 vol. 93 p. 327051 - 3270511

1050-2947

We present theoretical and experimental fully differential cross sections, in coplanar scattering geometry, forthe double ionization of helium by electron impacting at 2 keV. The observed structures for both equal and unequalsharing of the excess energy are analyzed. Although the incident energy could, in principle, be regarded as highenough for the applicability of the first Born approximation in the projectile-target interaction, the experimentalcross sections, measured with a COLTRIMS apparatus, show that further orders? effects can be appreciated. Thetheoretical cross sections are calculated with the generalized Sturmian functions method, whic