Effects of the radiative recombination on the intensity and polarization of the Ly-α emission of hydrogen-like ions
The intensity ratio of the Ly-α1(2p3/2→1s1/2) to Ly-α2(2p1/2→1s1/2) photon emission is analyzed for hydrogen-like Fe25+ ions if their excitation arises in a plasma not only from the electron impact but also due to the radiative recombination (RR) of initially bare Fe26+ ions. Under such conditions,...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
26 May 2010
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| In: |
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
Year: 2010, Volume: 268, Issue: 23, Pages: 3509-3516 |
| ISSN: | 1872-9584 |
| DOI: | 10.1016/j.nimb.2010.08.013 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.nimb.2010.08.013 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0168583X10007317 
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| Author Notes: | L. Bettadj, M.K. Inal, A. Surzhykov, S. Fritzsche |
| Summary: | The intensity ratio of the Ly-α1(2p3/2→1s1/2) to Ly-α2(2p1/2→1s1/2) photon emission is analyzed for hydrogen-like Fe25+ ions if their excitation arises in a plasma not only from the electron impact but also due to the radiative recombination (RR) of initially bare Fe26+ ions. Under such conditions, the intensity ratio and the (degree of) linear polarization of the Ly-α1 line are explored for collisions with an electron beam over a wide range of kinetic energies up to 50keV. Apart from the direct population of the 2p1/2,3/2 levels via the RR of bare ions, the contributions from radiative cascades and higher multipoles are taken into account by applying a fully relativistic theory for the motion of the electrons and the electron-photon coupling. Our calculations show an overall small effect of the RR upon the degree of the Ly-α1 polarization as well as the Ly-α1/Ly-α2 intensity ratio under usual plasma conditions. However, the effects from the RR of initially bare ions may become significant at electron beam energies ∼7-10keV, for plasma conditions far away from ionization equilibrium with a relatively large proportion of bare Fe ions, as it may be realized in electron-beam ion trap experiments. |
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| Item Description: | Gesehen am 30.01.2023 |
| Physical Description: | Online Resource |
| ISSN: | 1872-9584 |
| DOI: | 10.1016/j.nimb.2010.08.013 |