Abstract

We have measured the widths and energies of the 1s2s2p 2 P 1/2,3/2 → 1s 2 2s 2 S 1/2 transitions in lithiumlike sulfur and argon, as well as the energies of the forbidden 1s2s2p 4 P 5/2 → 1s 2 2s 2 S 1/2 M2 transition in both elements. All measurements were performed with a double-flat crystal spectrometer without the use of any reference line. The transition energy measurements have accuracies ranging from 2.3 ppm to 6.4 ppm depending on the element and line intensity. The widths and the intensity ratios of the 1s2s2p 2 P 1/2,3/2 → 1s 2 2s 2 S 1/2 lines have also been measured. These are the first reference-free measurements of transitions in core-excited lithiumlike ions, and have an accuracy comparable to the best relative measurements. We have also performed multi-configuration Dirac-Fock calculations of the widths, energies and intensity ratios. Extensive comparison between existing experimental results and theory is performed, and Bayesian techniques employed to extract the energy of the 1s 2p 2 4 P 1/2 → 1s 2 2p 2 P 1/2 transition in sulfur and identify contaminant transitions.

Highlights

  • Since the beginning of the spectroscopy of highly charged ions (HCIs), continuous improvement has been made in the accuracy of the measured transition energies across a broad range of elements

  • Measurements in HCIs have extended the tests of the fundamental theory of the interaction between light and matter in bound systems, known as bound-state quantum

  • II we briefly describe the experimental setup used in this work and provide a detailed description of the analysis method, which allows us to obtain the energies and widths with their uncertainties

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Summary

Introduction

Since the beginning of the spectroscopy of highly charged ions (HCIs), continuous improvement has been made in the accuracy of the measured transition energies across a broad range of elements. Others fundamental quantities like the Landé g factor in H-like ions such as carbon [5,6,7,8], oxygen [9], or silicon (28Si13+) [10,11] and in Li-like ions (28Si11+) [12] and the hyperfine structure have been measured to provide tests of BSQED [1]. These advances in HCI spectroscopy have provided important data for the diagnostics of astrophysical, laboratory, and fusion plasmas

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