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Träfflista för sökning "WFRF:(Strueder L.) srt2:(2013)"

Sökning: WFRF:(Strueder L.) > (2013)

  • Resultat 1-3 av 3
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1.
  • Pedersoli, E., et al. (författare)
  • Mesoscale morphology of airborne core-shell nanoparticle clusters : x-ray laser coherent diffraction imaging
  • 2013
  • Ingår i: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 46:16 SI, s. 164033-
  • Tidskriftsartikel (refereegranskat)abstract
    • Unraveling the complex morphology of functional materials like core-shell nanoparticles and its evolution in different environments is still a challenge. Only recently has the single-particle coherent diffraction imaging (CDI), enabled by the ultrabright femtosecond free-electron laser pulses, provided breakthroughs in understanding mesoscopic morphology of nanoparticulate matter. Here, we report the first CDI results for Co@SiO2 core-shell nanoparticles randomly clustered in large airborne aggregates, obtained using the x-ray free-electron laser at the Linac Coherent Light Source. Our experimental results compare favourably with simulated diffraction patterns for clustered Co@SiO2 nanoparticles with similar to 10 nm core diameter and similar to 30 nm shell outer diameter, which confirms the ability to resolve the mesoscale morphology of complex metastable structures. The findings in this first morphological study of core-shell nanomaterials are a solid base for future time-resolved studies of dynamic phenomena in complex nanoparticulate matter using x-ray lasers.
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2.
  • Loh, N. Duane, et al. (författare)
  • Sensing the wavefront of x-ray free-electron lasers using aerosol spheres
  • 2013
  • Ingår i: Optics Express. - 1094-4087. ; 21:10, s. 12385-12394
  • Tidskriftsartikel (refereegranskat)abstract
    • Characterizing intense, focused x-ray free electron laser (FEL) pulses is crucial for their use in diffractive imaging. We describe how the distribution of average phase tilts and intensities on hard x-ray pulses with peak intensities of 1021 W/m(2) can be retrieved from an ensemble of diffraction patterns produced by 70 nm-radius polystyrene spheres, in a manner that mimics wavefront sensors. Besides showing that an adaptive geometric correction may be necessary for diffraction data from randomly injected sample sources, our paper demonstrates the possibility of collecting statistics on structured pulses using only the diffraction patterns they generate and highlights the imperative to study its impact on single-particle diffractive imaging.
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3.
  • Park, Hyung Joo, et al. (författare)
  • Toward unsupervised single-shot diffractive imaging of heterogeneous particles using X-ray free-electron lasers
  • 2013
  • Ingår i: Optics Express. - 1094-4087. ; 21:23, s. 28729-28742
  • Tidskriftsartikel (refereegranskat)abstract
    • Single shot diffraction imaging experiments via X-ray free-electron lasers can generate as many as hundreds of thousands of diffraction patterns of scattering objects. Recovering the real space contrast of a scattering object from these patterns currently requires a reconstruction process with user guidance in a number of steps, introducing severe bottlenecks in data processing. We present a series of measures that replace user guidance with algorithms that reconstruct contrasts in an unsupervised fashion. We demonstrate the feasibility of automating the reconstruction process by generating hundreds of contrasts obtained from soot particle diffraction experiments.
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  • Resultat 1-3 av 3

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