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Sökning: WFRF:(Sheppard B) > Lowney D.P.

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1.
  • Cavalieri, A L, et al. (författare)
  • Clocking femtosecond X rays.
  • 2005
  • Ingår i: Phys Rev Lett. - 0031-9007. ; 94:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse Source at the Stanford Linear-Accelerator Center we solved this problem by measuring the arrival time of each high energy electron bunch with electro-optic sampling. This measurement indirectly determined the arrival time of each x-ray pulse relative to an external pump laser pulse with a time resolution of better than 60 fs rms.
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2.
  • Gaffney, K J, et al. (författare)
  • Observation of structural anisotropy and the onset of liquidlike motion during the nonthermal melting of InSb
  • 2005
  • Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 95:12
  • Tidskriftsartikel (refereegranskat)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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