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Search: WFRF:(Cardoch Sebastian) > (2023)

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1.
  • Trost, Fabian, et al. (author)
  • Imaging via Correlation of X-Ray Fluorescence Photons
  • 2023
  • In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 130:17
  • Journal article (peer-reviewed)abstract
    • We demonstrate that x-ray fluorescence emission, which cannot maintain a stationary interference pattern, can be used to obtain images of structures by recording photon-photon correlations in the manner of the stellar intensity interferometry of Hanbury Brown and Twiss. This is achieved utilizing femtosecondduration pulses of a hard x-ray free-electron laser to generate the emission in exposures comparable to the coherence time of the fluorescence. Iterative phasing of the photon correlation map generated a model-free real-space image of the structure of the emitters. Since fluorescence can dominate coherent scattering, this may enable imaging uncrystallised macromolecules.
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2.
  • Cardoch, Sebastian, et al. (author)
  • Decreasing ultrafast x-ray pulse durations with saturable absorption and resonant transitions
  • 2023
  • In: Physical review. E. - : American Physical Society. - 2470-0045 .- 2470-0053. ; 107:1
  • Journal article (peer-reviewed)abstract
    • Saturable absorption is a nonlinear effect where a material's ability to absorb light is frustrated due to a high influx of photons and the creation of electron vacancies. Experimentally induced saturable absorption in copper revealed a reduction in the temporal duration of transmitted x-ray laser pulses, but a detailed account of changes in opacity and emergence of resonances is still missing. In this computational work, we employ nonlocal thermodynamic equilibrium plasma simulations to study the interaction of femtosecond x rays and copper. Following the onset of frustrated absorption, we find that a K–M resonant transition occurring at highly charged states turns copper opaque again. The changes in absorption generate a transient transparent window responsible for the shortened transmission signal. We also propose using fluorescence induced by the incident beam as an alternative source to achieve shorter x-ray pulses. Intense femtosecond x rays are valuable to probe the structure and dynamics of biological samples or to reach extreme states of matter. Shortened pulses could be relevant for emerging imaging techniques.
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