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Emergence of pseudoresonance in high-intensity resonant inelastic x-ray scattering

Son, Sang Kil ; Kjellsson, L. LU ; Såthe, C. LU and Rubensson, J.-E. (2025) In Physical Review A 112(5).
Abstract
We report resonant inelastic x-ray scattering (RIXS) spectra of neon atoms interacting with intense x-ray pulses generated using an x-ray free-electron laser (XFEL). We find that an unexpected peak emerges near the Ka line of Ne, which does not coincide with any physical resonances of neon ions. We perform theoretical calculations based on a quantum-state-resolved rate-equation approach with x-ray-induced processes including possible resonant excitations. Our dynamics simulations demonstrate that a sequence of multiple resonant photoabsorption events are involved and the interplay of those multiple resonances in combination with the relatively large spectral bandwidth of XFEL radiation leads to the emergent resonance-like structure at a... (More)
We report resonant inelastic x-ray scattering (RIXS) spectra of neon atoms interacting with intense x-ray pulses generated using an x-ray free-electron laser (XFEL). We find that an unexpected peak emerges near the Ka line of Ne, which does not coincide with any physical resonances of neon ions. We perform theoretical calculations based on a quantum-state-resolved rate-equation approach with x-ray-induced processes including possible resonant excitations. Our dynamics simulations demonstrate that a sequence of multiple resonant photoabsorption events are involved and the interplay of those multiple resonances in combination with the relatively large spectral bandwidth of XFEL radiation leads to the emergent resonance-like structure at a position where no resonances exist. Our finding offers critical guidance for future applications of high-intensity RIXS at XFEL facilities. © (2025), (Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.), All Rights Reserved. (Less)
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Contribution to journal
publication status
published
subject
keywords
Electrons, Equations of state, Excited states, Free electron lasers, Neon, Quantum theory, High intensity, Neon atoms, Neon ions, Quantum state, Rate equation approach, Resonant inelastic x-ray scattering, Theoretical calculations, X ray pulse, X-ray free electron lasers, X-ray scattering spectra, X ray scattering
in
Physical Review A
volume
112
issue
5
article number
L051101
publisher
American Physical Society
external identifiers
  • scopus:105027140457
ISSN
2469-9926
DOI
10.1103/drmh-vmgk
language
English
LU publication?
yes
id
e578efa3-56c1-461b-824f-a4a3e3bec613
date added to LUP
2026-03-23 15:58:56
date last changed
2026-03-23 15:59:14
@article{e578efa3-56c1-461b-824f-a4a3e3bec613,
  abstract     = {{We report resonant inelastic x-ray scattering (RIXS) spectra of neon atoms interacting with intense x-ray pulses generated using an x-ray free-electron laser (XFEL). We find that an unexpected peak emerges near the Ka line of Ne, which does not coincide with any physical resonances of neon ions. We perform theoretical calculations based on a quantum-state-resolved rate-equation approach with x-ray-induced processes including possible resonant excitations. Our dynamics simulations demonstrate that a sequence of multiple resonant photoabsorption events are involved and the interplay of those multiple resonances in combination with the relatively large spectral bandwidth of XFEL radiation leads to the emergent resonance-like structure at a position where no resonances exist. Our finding offers critical guidance for future applications of high-intensity RIXS at XFEL facilities. © (2025), (Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.), All Rights Reserved.}},
  author       = {{Son, Sang Kil and Kjellsson, L. and Såthe, C. and Rubensson, J.-E.}},
  issn         = {{2469-9926}},
  keywords     = {{Electrons; Equations of state; Excited states; Free electron lasers; Neon; Quantum theory; High intensity; Neon atoms; Neon ions; Quantum state; Rate equation approach; Resonant inelastic x-ray scattering; Theoretical calculations; X ray pulse; X-ray free electron lasers; X-ray scattering spectra; X ray scattering}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review A}},
  title        = {{Emergence of pseudoresonance in high-intensity resonant inelastic x-ray scattering}},
  url          = {{http://dx.doi.org/10.1103/drmh-vmgk}},
  doi          = {{10.1103/drmh-vmgk}},
  volume       = {{112}},
  year         = {{2025}},
}