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Optical and EUV spectroscopy of highly charged ions near the 4f–5s level crossing

Bekker, Hendrik

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In recent years, various highly charged ions (HCI) with optical transitions have been proposed for metrology and searches of a possible variation of the fine-structure constant α. Optical transitions in HCI are uncommon due to the scaling of energy levels with atomic number Z^2 . At the 4f–5s level crossing, three configurations are nearly degenerate, and thus many optical transitions can exist. The complex many-electron couplings reduce the accuracy of current calculations. Moreover, experimental data to benchmark the predictions is lacking. Spectra in the optical and extreme-ultraviolet (EUV) range of several ion species near the 4f–5s level crossing were measured at the Heidelberg electron beam ion trap. A collisional-radiative model was employed for the interpretation of the EUV data, resulting in the first identification of the long sought-after 5s–5p transitions in Pm-like Re^14+ , Os^15+ , Ir^16+ , and Pt^17+. The characteristic line shapes of optical transitions in Ir17+ were studied, with the aim of identifying transitions with a high sensitivity to α-variation. Previously suggested candidates could be excluded and new candidates were proposed. This data provides a stringent benchmark for state-of-the-art precision atomic theory.

Document type: Dissertation
Supervisor: Crespo López-Urrutia, PD Dr. José R.
Date of thesis defense: 18 May 2016
Date Deposited: 01 Jun 2016 07:42
Date: 2016
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Physics
DDC-classification: 500 Natural sciences and mathematics
530 Physics
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