Absolute measurement of the relativistic magnetic dipole transition in He-like sulfur

Jorge Machado, Nancy Paul, Gabrielle Soum-Sidikov, Louis Duval, Stéphane Macé, Robert Loetzsch, Martino Trassinelli, Paul Indelicato

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We have made an absolute, reference-free measurement of the 1s2sS13→1s2S01 relativistic magnetic dipole transition in He-like sulfur. The highly charged sulfur ions were provided by an electron-cyclotron resonance ion source, and the x rays were analyzed with a high-precision double-crystal spectrometer. A transition energy of 2430.3685(97) eV was obtained and is compared to most advanced bound-state quantum electrodynamics calculations, providing an important test of two-electron QED effects and precision atomic structure methods in medium-Z species. Thanks to the extremely narrow natural linewidth of this transition and to the large dispersion of the spectrometer at this energy, a complementary study is also performed to evaluate the impact of different silicon crystal atomic form-factor models in the transition-energy analysis. We find no significant dependence on the model used to determine the transition energy.
Original languageEnglish
Article number032821
JournalPhysical Review A
Issue number3
Publication statusPublished - Mar 2023


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