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Sökning: WFRF:(Albertini Simon)

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1.
  • Laimer, Felix, et al. (författare)
  • Highly Charged Droplets of Superfluid Helium
  • 2019
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 123:16
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the production and study of stable, highly charged droplets of superfluid helium. Using a novel experimental setup we produce neutral beams of liquid helium nanodroplets containing millions of atoms or more that can be ionized by electron impact, mass-per-charge selected, and ionized a second time before being analyzed. Droplets containing up to 55 net positive charges are identified and the appearance sizes of multiply charge droplets are determined as a function of the charge state. We show that the droplets are stable on the millisecond timescale of the experiment and decay through the loss of small charged clusters, not through symmetric Coulomb explosions.
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2.
  • Martini, Paul, et al. (författare)
  • Splashing of Large Helium Nanodroplets upon Surface Collisions
  • 2021
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 127:26
  • Tidskriftsartikel (refereegranskat)abstract
    • In the present work we observe that helium nanodroplets colliding with surfaces can exhibit splashing in a way that is analogous to classical liquids. We use transmission electron microscopy and mass spectrometry to demonstrate that neutral and ionic dopants embedded in the droplets are efficiently backscattered in such events. High abundances of weakly bound He-tagged ions of both polarities indicate a gentle extraction mechanism of these ions from the droplets upon collision with a solid surface. This backscattering process is observed for dopant particles with masses up to 400 kilodaltons, indicating an unexpected mechanism that effectively lowers deposition rates of nanoparticles formed in helium droplets.
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