Open AccessElectron-impact ionization of helium: A comprehensive experiment benchmarks theory
Author(s) -
Xueguang Ren,
Igor Bray,
Dmitry V. Fursa,
J. Colgan,
M. S. Pindzola,
Thomas Pflüger,
Arne Senftleben,
Shenyue Xu,
Alexander Dorn,
J. Ullrich
Publication year - 2011
Publication title -
physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics
Language(s) - English
Resource type - Journals
eISSN - 1094-1622
pISSN - 1050-2947
DOI - 10.1103/physreva.83.052711
Subject(s) - physics , helium , ionization , atomic physics , electron ionization , close coupling , electron , coupling (piping) , helium atom , differential (mechanical device) , nuclear physics , ion , quantum mechanics , mechanical engineering , engineering , thermodynamics
Single ionization of helium by 70.6-eV electron impact is studied in a comprehensive experiment covering a major part of the entire collision kinematics and the full 4π solid angle for the emitted electron. The absolutely normalized triple-differential experimental cross sections are compared with results from the convergent close-coupling (CCC) and the time-dependent close-coupling (TDCC) theories. Whereas excellent agreement with the TDCC prediction is only found for equal energy sharing, the CCC calculations are in excellent agreement with essentially all experimentally observed dynamical features, including the absolute magnitude of the cross sections