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Träfflista för sökning "WFRF:(Akre K) ;pers:(Schlarb H.);pers:(von der Linde D)"

Search: WFRF:(Akre K) > Schlarb H. > Von der Linde D

  • Result 1-3 of 3
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1.
  • Gaffney, K J, et al. (author)
  • Observation of structural anisotropy and the onset of liquidlike motion during the nonthermal melting of InSb
  • 2005
  • In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 95:12
  • Journal article (peer-reviewed)abstract
    • The melting dynamics of laser excited InSb have been studied with femtosecond x-ray diffraction. These measurements observe the delayed onset of diffusive atomic motion, signaling the appearance of liquidlike dynamics. They also demonstrate that the root-mean-squared displacement in the [111] direction increases faster than in the [110] direction after the first 500 fs. This structural anisotropy indicates that the initially generated fluid differs significantly from the equilibrium liquid.
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2.
  • Fritz, D. M., et al. (author)
  • Ultrafast bond softening in bismuth : Mapping a solid's interatomic potential with X-rays
  • 2007
  • In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 315:5812, s. 633-636
  • Journal article (peer-reviewed)abstract
    • Intense femtosecond laser excitation can produce transient states of matter that would otherwise be inaccessible to laboratory investigation. At high excitation densities, the interatomic forces that bind solids and determine many of their properties can be substantially altered. Here, we present the detailed mapping of the carrier density-dependent interatomic potential of bismuth approaching a solid-solid phase transition. Our experiments combine stroboscopic techniques that use a high-brightness linear electron accelerator-based x-ray source with pulse-by-pulse timing reconstruction for femtosecond resolution, allowing quantitative characterization of the interatomic potential energy surface of the highly excited solid.
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3.
  • Lindenberg, AM, et al. (author)
  • Atomic-scale visualization of inertial dynamics
  • 2005
  • In: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 308:5720, s. 392-395
  • Journal article (peer-reviewed)abstract
    • The motion of atoms on interatomic potential energy surfaces is fundamental to the dynamics of liquids and solids. An accelerator-based source of femtosecond x-ray pulses allowed us to follow directly atomic displacements on an optically modified energy landscape, leading eventually to the transition from crystalline solid to disordered liquid. We show that, to first order in time, the dynamics are inertial, and we place constraints on the shape and curvature of the transition-state potential energy surface. Our measurements point toward analogies between this nonequilibrium phase transition and the short-time dynamics intrinsic to equilibrium liquids.
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