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Träfflista för sökning "WFRF:(Rudawski Piotr) srt2:(2020)"

Sökning: WFRF:(Rudawski Piotr) > (2020)

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1.
  • Maclot, Sylvain, et al. (författare)
  • Dissociation dynamics of the diamondoid adamantane upon photoionization by XUV femtosecond pulses
  • 2020
  • Ingår i: Scientific Reports. - : Nature Research. - 2045-2322. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • This work presents a photodissociation study of the diamondoid adamantane using extreme ultraviolet femtosecond pulses. The fragmentation dynamics of the dication is unraveled by the use of advanced ion and electron spectroscopy giving access to the dissociation channels as well as their energetics. To get insight into the fragmentation dynamics, we use a theoretical approach combining potential energy surface determination, statistical fragmentation methods and molecular dynamics simulations. We demonstrate that the dissociation dynamics of adamantane dications takes place in a two-step process: barrierless cage opening followed by Coulomb repulsion-driven fragmentation.
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2.
  • Malm, Erik, et al. (författare)
  • Singleshot polychromatic coherent diffractive imaging with a high-order harmonic source
  • 2020
  • Ingår i: Optics Express. - 1094-4087. ; 28:1, s. 394-404
  • Tidskriftsartikel (refereegranskat)abstract
    • Singleshot polychromatic coherent diffractive imaging is performed with a high-intensity high-order harmonic generation source. The coherence properties are analyzed and several reconstructions show the shot-to-shot fluctuations of the incident beam wavefront. The method is based on a multi-step approach. First, the spectrum is extracted from double-slit diffraction data. The spectrum is used as input to extract the monochromatic sample diffraction pattern, then phase retrieval is performed on the quasi-monochromatic data to obtain the sample's exit surface wave. Reconstructions based on guided error reduction (ER) and alternating direction method of multipliers (ADMM) are compared. ADMM allows additional penalty terms to be included in the cost functional to promote sparsity within the reconstruction.
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