Photoionization of two electrons in helium
- 1 December 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (11) , R6980-R6982
- https://doi.org/10.1103/physreva.44.r6980
Abstract
Cross sections for ionization of two electrons in helium by high-energy photons have been evaluated using many-body perturbation theory. All lowest-order amplitudes [from the effects of shakeoff, ground-state correlation, and the absorption of a photon by one electron, which then hits another electron (two-step 1)] are included. At a photon energy of 2.8 keV our calculated ratio of double- to single-ionzation cross sections is 1.6%, in agreement with a very recently observed value of 1.6±0.3%.Keywords
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