TY - JOUR
T1 - Triple coincidence (e,γ2e) experiment for simultaneous electron impact ionization excitation of helium
AU - Sakhelashvili, G.
AU - Dorn, A.
AU - Höhr, C.
AU - Ullrich, J.
AU - Kheifets, A. S.
AU - Lower, J.
AU - Bartschat, K.
PY - 2005/7/15
Y1 - 2005/7/15
N2 - Simultaneous ionization and excitation of helium atoms by 500 eV electron impact is observed by a triple coincidence of an ionized slow electron, the recoiling He+ ion, and the radiated vacuum ultraviolet photon (λ≤30.4nm). Kinematically complete differential cross sections are presented for the He+(2p)2P final ionic state, demonstrating the feasibility of a quantum mechanically complete experiment. The experimental data are compared to predictions from state-of-the-art numerical calculations. For large momentum transfers, a first-order treatment of the projectile-target interaction can reproduce the experimental angular dependence, but a second-order treatment is required to obtain consistent magnitudes.
AB - Simultaneous ionization and excitation of helium atoms by 500 eV electron impact is observed by a triple coincidence of an ionized slow electron, the recoiling He+ ion, and the radiated vacuum ultraviolet photon (λ≤30.4nm). Kinematically complete differential cross sections are presented for the He+(2p)2P final ionic state, demonstrating the feasibility of a quantum mechanically complete experiment. The experimental data are compared to predictions from state-of-the-art numerical calculations. For large momentum transfers, a first-order treatment of the projectile-target interaction can reproduce the experimental angular dependence, but a second-order treatment is required to obtain consistent magnitudes.
UR - http://www.scopus.com/inward/record.url?scp=27144456111&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.95.033201
DO - 10.1103/PhysRevLett.95.033201
M3 - Article
SN - 0031-9007
VL - 95
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 033201
ER -