SAMOP 2023 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Collisions, Scattering and Correlation Phenomena

A 2.6: Vortrag

Montag, 6. März 2023, 12:15–12:30, F107

Hyperfine-induced effect on angular and polarization behaviors of the Kα₁ line following electron-impact excitation of He-like Tl⁷⁹⁺ ions — •Zhongwen Wu^1,2,3, Ziqiang Tian¹, Jun Jiang¹, Chenzhong Dong¹, and Stephan Fritzsche^2,3,4 — ¹Northwest Normal University, P. R. China — ²Helmholtz-Institut Jena, Germany — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany — ⁴Friedrich-Schiller-Universität Jena, Germany

For atoms or ions with nonzero nuclear spin, the hyperfine interaction of nuclear magnetic moment with those of bound electrons leads to splitting of their fine-structure levels and, thus, affects their excitation and decay properties. In this contribution, we studied angular and polarization behaviors of the Kα₁ line following electron-impact excitation of He-like spin-1/2 Tl⁷⁹⁺ ions using the multiconfigurational Dirac-Fock method and relativistic distorted-wave theory. Special attention was paid to the effect of the hyperfine interaction on the behaviors. It was found that the hyperfine-induced effect depends dominantly on impact electron energy. For low energies close to the excitation threshold, the hyperfine interaction contributes to making the Kα₁ line more anisotropic and polarized. In contrast, such an effect diminishes quickly with increasing energy and even vanishes at medium and high energies, which is rather different from the case of radiative electron capture. The present study is accessible at both electron-beam ion traps and ion storage rings and thus accurate angular or polarization measurements of the Kα₁ line at low energies are expected to probe the hyperfine interaction in highly charged few-electron ions.