Abstract
Electron-ion coincidence experimental data obtained following argon photoionization are reported. Slow photoelectrons were measured in coincidence with and ions, and the angular distribution parameter was obtained. The measured beta parameter for the -photoelectron coincidence measurements shows a significant deviation from the expected value. With the support of a quantum mechanical theory of post-collision interaction (PCI) which goes beyond the standard model, we attribute this deviation to angular-momentum exchange due to the interaction of the photoelectron with the Auger electron, while the role of the residual ion is negligible. The main mechanism of angular-momentum transfer and its effect on the asymmetry parameter near the photoionization threshold are considered.
- Received 5 December 2018
DOI:https://doi.org/10.1103/PhysRevA.99.063409
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