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Search: WFRF:(Loh M) > Engineering and Technology

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1.
  • Laksmono, Hartawan, et al. (author)
  • Anomalous Behavior of the Homogeneous Ice Nucleation Rate in No-Man's Land
  • 2015
  • In: The Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 6:14, s. 2826-2832
  • Journal article (peer-reviewed)abstract
    • We present an analysis of ice nucleation kinetics from near-ambient pressure water as temperature decreases below the homogeneous limit T-H by cooling micrometer-sized droplets (microdroplets) evaporatively at 10(3)-10(4) K/s and probing the structure ultrafast using femtosecond pulses from the Linac Coherent Light Source (LCLS) free-electron X-ray laser. Below 232 K, we observed a slower nucleation rate increase with decreasing temperature than anticipated from previous measurements, which we suggest is due to the rapid decrease in water's diffusivity. This is consistent with earlier findings that microdroplets do not crystallize at <227 K, but vitrify at cooling rates of 10(6)-10(7) K/s. We also hypothesize that the slower increase in the nucleation rate is connected with the proposed fragile-to-strong transition anomaly in water.
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2.
  • Sala, S., et al. (author)
  • Ptychographic imaging for the characterization of X-ray free-electron laser beams
  • 2017
  • In: X-RAY MICROSCOPY CONFERENCE 2016 (XRM 2016). - : IOP Publishing.
  • Conference paper (peer-reviewed)abstract
    • We present some preliminary results from a study aimed at the characterization of the wavefront of X-ray free electron laser (XFEL) beams in the same operation conditions as for single particle imaging (or flash X-ray imaging) experiments. The varying illumination produced by wavefront fluctuations between several pulses leads to a partially coherent average beam which can be decomposed into several coherent modes using ptychographic reconstruction algorithms. Such a decomposition can give insight into pulse-to-pulse variations of the wavefront. We discuss data collected at the Linac Coherent Light Source (LCLS) and FERMI.
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