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          Institute: MPI für Kernphysik     Collection: Precision Spectroscopy and Ultracold Ensembles     Display Documents



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ID: 498526.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
Absolut- und Relativbestimmungen der Energien von 2p-1s-Übergängen in wasserstoff-, helium- sowie lithiumartigen Schwefel-, Argon- und Eisenionen
Authors:Kubicek, Katharina
Referees:Crespo López-Urrutia, José R.; Stöhlker, Thomas
Language:German
Date of Approval (YYYY-MM-DD):2010-07-07
Name of University:Ruprecht-Karls-Universität
Place of University:Heidelberg
Physical Description
(e.g. Total Number of Pages):
VI, 216 S. : Ill., graph. Darst.
Audience:Experts Only
Abstract / Description:Within this work, high-precision wavelength measurements were carried out without reference lines on the Lyman-$alpha_1$ transitions in S$^{15+}$ and Ar$^{17+}$, as well as the $1s2p 1^P_1 rightarrow 1s2 1^S_0$ („w“) transitions in S$^{14+}$ and Ar$^{16+}$ making use of a special technique of Bragg-angle determination in
combination with a flat crystal spectrometer. The wavelengths of the w line in Fe$^{24+}$ and dielectronic satellite lines in Fe$^{23+}$ and Fe$^{22+}$ were also measured with respect to the Lyman-$alpha$ lines in Fe$^{25+}$. The result for the resonance line in S$^{14+}$ of 2460.626(3) eV with a relative uncertainty of approx. 1.2 ppm is the most precise x-ray wavelength reported for highly charged ions to date, and allows to test recent predictions for QED two-electron and two-photon radiative corrections for He-like ions. The values obtained for the wavelengths of the lines in Fe$^{23+}$ reveal a significant discrepancy with predictions for the Li-like system with Z = 26. The excellent agreement with predictions for the hydrogen-like systems, which have very small theoretical uncertainties, demonstrates on one hand the reliability of our method. On the other hand, these measurements constitute the most accurate absolute test of those calculations. The already small sources of systematic uncertainty in previous experiments were nearly completely eliminated by using a setup in which the ion cloud appears as a point source.
Document Type:PhD-Thesis
Communicated by:vogt
Affiliations:MPI für Kernphysik/Group of J. Ullrich/Electron Beam Ion Trap ( J.R. Crespo Lopez-Urrutia)
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