Angle-resolved linear polarization of characteristic lines following innershell photoionization of atoms

Z. W. Wu; W. Liu; S. Fritzsche

doi:10.1140/epjd/s10053-024-00859-x

2024 Impact factor 1.5

Atomic, Molecular, Optical and Plasma Physics

Atomic Spectra and Oscillator Strengths (ASOS14)

Eur. Phys. J. D (2024) 78: 69
https://doi.org/10.1140/epjd/s10053-024-00859-x

Regular Article - Atomic Physics

Angle-resolved linear polarization of characteristic lines following innershell $2 p_{3 / 2}$ $2p_{3/2}$ photoionization of atoms

Z. W. Wu¹^,2^,3^a, W. Liu¹ and S. Fritzsche²^,3^,4

¹ Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, 730070, Lanzhou, People’s Republic of China
² Helmholtz-Institut Jena, Fröbelstieg 3, 07743, Jena, Germany
³ GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291, Darmstadt, Germany
⁴ Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany

^a zhongwen.wu@nwnu.edu.cn

Received: 27 January 2024
Accepted: 6 May 2024
Published online: 3 June 2024

Abstract

In this paper, we aim to investigate angle-resolved linear polarization of the $L α_{1} (3 d_{5 / 2} \to 2 p_{3 / 2})$ $L\alpha _{1} \, (3d_{5/2} \!\rightarrow \! 2p_{3/2})$ , $L α_{2} (3 d_{3 / 2} \to 2 p_{3 / 2})$ $L\alpha _{2} \, (3d_{3/2} \!\rightarrow \! 2p_{3/2})$ , and $L ℓ (3 s_{1 / 2} \to 2 p_{3 / 2})$ $L\ell \, (3s_{1/2} \!\rightarrow \! 2p_{3/2})$ characteristic lines following innershell $2 p_{3 / 2}$ $2p_{3/2}$ photoionization of selected neutral atoms with closed subshells by unpolarized or linearly polarized ionizing light within the framework of the density-matrix theory. To this aim, a relativistic single-configuration Dirac–Hartree–Fock approximation and the electric dipole approximation of the radiation fields are used to calculate the $2 p_{3 / 2}$ $2p_{3/2}$ photoionization amplitudes of those atoms, the alignment parameter of the photoionized $2 p_{3 / 2}^{- 1}$ $2p^{-1}_{3/2}$ hole state, and thus the angle-resolved linear polarization of the characteristic lines. It is found that the angle-resolved linear polarization of the $L α_{1, 2}$ $L\alpha _{1, \, 2}$ and $L ℓ$ $L\ell$ lines behaves very differently for different polarization cases of the ionizing light under consideration. In addition, at given ionizing photon energies the $L α_{1}$ $L\alpha _{1}$ line is found to be the least linearly polarized for all different ionizing polarization cases, whereas the linear polarization of both the $L α_{2}$ $L\alpha _{2}$ and $L ℓ$ $L\ell$ lines is much stronger and, actually, rather close to each other despite always having opposite polarization signs. As the nuclear charge and the ionizing photon energy increase, moreover, each of these lines becomes more and more linearly polarized, respectively.

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