High-Precision Transition Energy Measurements of Neonlike Fe XVII Ions
arxiv(2024)
摘要
We improve eight-fold the energy accuracy of the strongest soft X-ray
transitions of Fe XVII ions by resonantly exciting them in an electron beam ion
trap with a monochromatic beam at the P04 beamline of the PETRA III synchrotron
facility. By simultaneously tracking instantaneous photon-energy fluctuations
with a high-resolution photoelectron spectrometer, we minimize systematic
uncertainties down to velocity-equivalent +/- 5 km/s in their rest energies,
substantially improving our knowledge of this key astrophysical ion. Our
large-scale configuration-interaction computations include more than four
million configurations and agree with the experiment at a level without
precedent for a ten-electron system. Thereby, theoretical uncertainties for
interelectronic correlations become far smaller than those of quantum
electrodynamics (QED) corrections. The present QED benchmark strengthens our
trust in future calculations of many other complex atomic ions of interest to
astrophysics, plasma physics, and for the development of optical clocks with
highly charged ions.
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