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High-Precision Determination of Oxygen-Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen

MPS-Authors
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Kühn,  Steffen
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Micke,  P.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Shah,  Chintan
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Pfeifer,  T.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Crespo López Urrutia,  J. R.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Bernitt,  S.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Fulltext (public)

2003.13838.pdf
(Preprint), 3MB

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Citation

Leutenegger, M. A., Kühn, S., Micke, P., Steinbrügge, R., Stierhof, J., Shah, C., et al. (2020). High-Precision Determination of Oxygen-Kα Transition Energy Excludes Incongruent Motion of Interstellar Oxygen. Physical Review Letters, 125(24): 243001. doi:10.1103/PhysRevLett.125.243001.


Cite as: http://hdl.handle.net/21.11116/0000-0007-8E54-B
Abstract
We demonstrate a widely applicable technique to absolutely calibrate the energy scale of x-ray spectra with experimentally well-known and accurately calculable transitions of highly charged ions, allowing us to measure the K-shell Rydberg spectrum of molecular O$_2$ with 8 meV uncertainty. We reveal a systematic $\sim$450 meV shift from previous literature values, and settle an extraordinary discrepancy between astrophysical and laboratory measurements of neutral atomic oxygen, the latter being calibrated against the aforementioned O$_2$ literature values. Because of the widespread use of such, now deprecated, references, our method impacts on many branches of x-ray absorption spectroscopy. Moreover, it potentially reduces absolute uncertainties there to below the meV level.