Line-shape broadening of an autoionizing state in helium at high XUV intensity

Aufleger, Lennart; Friebel, Patrick; Rupprecht, Patrick; Magunia, Alexander; Ding, Thomas; Rebholz, Marc; Hartmann, Maximilian; Ott, Christian; Pfeifer, Thomas

doi:10.1088/1367-2630/ac3b2e

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Line-shape broadening of an autoionizing state in helium at high XUV intensity

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

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

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

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

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

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

/persons/resource/persons135200

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

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

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

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https://iopscience.iop.org/article/10.1088/1367-2630/ac3b2e/pdf
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Citation

Aufleger, L., Friebel, P., Rupprecht, P., Magunia, A., Ding, T., Rebholz, M., et al. (2022). Line-shape broadening of an autoionizing state in helium at high XUV intensity. New Journal of Physics, 24: 013014. doi:10.1088/1367-2630/ac3b2e.

Cite as: https://hdl.handle.net/21.11116/0000-0009-E3D2-9

Abstract

We study the interaction of intense extreme ultraviolet (XUV) light with the 2s2p doubly excited state in helium. In addition to previously understood energy-level and phase shifts, high XUV intensities may lead to other absorption-line-shape distortions. Here, we report on experimental transient-absorption spectroscopy results on the 2s2p line-width modification in helium in intense stochastic XUV fields. A few-level-model simulation is realized to investigate the origins of this effect. We find that the line-shape broadening is connected to the strong coupling of the ground state to the 2s2p doubly excited state which is embedded in the ionization continuum. As the broadening takes place for intensities lower than for other strong-coupling processes, e.g. observed asymmetry changes of the absorption profile, this signature can be identified already in an intermediate intensity regime. These findings are in general relevant for resonant inner-shell transitions in nonlinear experiments with XUV and x-ray photon energies at high intensity.