4.3 Article

A new benchmark of soft X-ray transition energies of Ne, CO2, and SF6: paving a pathway towards ppm accuracy

Journal

EUROPEAN PHYSICAL JOURNAL D
Volume 76, Issue 3, Pages -

Publisher

SPRINGER
DOI: 10.1140/epjd/s10053-022-00355-0

Keywords

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Funding

  1. Max-Planck-Gesellschaft (MPG) [05K13SJ2]
  2. Bundesministerium fur Bildung und Forschung (BMBF) [05K13SJ2]
  3. Lawrence Livermore National Laboratory (LLNL) Visiting Scientist and Professional Program [VA007036, VA007589]
  4. MPG
  5. National Research Foundation of Korea [NRF-2016R1A5A1013277]
  6. U. S. Department of Energy [DE-AC52-07NA27344]
  7. NASA [80GSFC21M0002]
  8. NASA's Astrophysics Program
  9. NASA Space Technology Research Fellowship
  10. ERASMUS+ traineeship program

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Accurate knowledge of transition energies is crucial for the correct interpretation of high-resolution X-ray spectra. In this study, we investigated the K-shell features of Ne, CO2, and SF6 gases by measuring their photo ion-yield spectra and comparing them to ab initio calculations. Our results showed good agreement with previous measurements for CO2, but large discrepancies for Ne and SF6, potentially due to systematic effects. Combining absolute and relative calibration techniques could further improve the accuracy of these measurements.
A key requirement for the correct interpretation of high-resolution X-ray spectra is that transition energies are known with high accuracy and precision. We investigate the K-shell features of Ne, CO2, and SF6 gases, by measuring their photo ion-yield spectra at the BESSY II synchrotron facility simultaneously with the 1s-np fluorescence emission of He-like ions produced in the Polar-X EBIT. Accurate ab initio calculations of transitions in these ions provide the basis of the calibration. While the CO2 result agrees well with previous measurements, the SF6 spectrum appears shifted by similar to 0.5eV, about twice the uncertainty of the earlier results. Our result for Ne shows a large departure from earlier results, but may suffer from larger systematic effects than our other measurements. The molecular spectra agree well with our results of time-dependent density functional theory. We find that the statistical uncertainty allows calibrations in the desired range of 1-10 meV, however, systematic contributions still limit the uncertainty to similar to 40-100 meV, mainly due to the temporal stability of the monochromator energy scale. Combining our absolute calibration technique with a relative energy calibration technique such as photoelectron energy spectroscopy will be necessary to realize its full potential of achieving uncertainties as low as 1-10 meV.

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