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Photoelectron-Auger-electron angular-momentum transfer in core-ionized Ar: Beyond the standard post-collision-interaction model
Sorbonne Univ, Lab Chim Phys Matiere & Rayonnement, CNRS, UMR 7614, F-75005 Paris, France.
Peter Great St Petersburg Polytech Univ, Dept Expt Phys, St Petersburg 195251, Russia.
St Petersburg State Marine Tech Univ, Dept Phys, St Petersburg 190121, Russia.
Sorbonne Univ, Lab Chim Phys Matiere & Rayonnement, CNRS, UMR 7614, F-75005 Paris, France.
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2019 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 99, no 6, article id 063409Article in journal (Refereed) Published
Abstract [en]

Electron-ion coincidence experimental data obtained following argon 1s photoionization are reported. Slow photoelectrons were measured in coincidence with Ar+ and Ar2+ ions, and the beta angular distribution parameter was obtained. The measured beta parameter for the Ar2+-photoelectron coincidence measurements shows a significant deviation from the beta = 2 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 beta near the photoionization threshold are considered.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 6, article id 063409
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Fusion, Plasma and Space Physics Atom and Molecular Physics and Optics
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URN: urn:nbn:se:uu:diva-390207DOI: 10.1103/PhysRevA.99.063409ISI: 000471941800002OAI: oai:DiVA.org:uu-390207DiVA, id: diva2:1341524
Available from: 2019-08-09 Created: 2019-08-09 Last updated: 2019-08-09Bibliographically approved

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Piancastelli, Maria Novella

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Physical Review A: covering atomic, molecular, and optical physics and quantum information
Fusion, Plasma and Space PhysicsAtom and Molecular Physics and Optics

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