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A femtosecond X-ray/optical cross-correlator

  • Cornelius Gahl
  • Armin Azima
  • Martin Beye
  • Martin Deppe
  • Kristian Doebrich
  • Urs Hasslinger
  • Franz Hennies
  • Alexej Melnikov
  • Mitsuru Nagasono
  • Annette Pietzsch
  • Martin Wolf
  • Wilfried Wurth
  • Alexander Foehlisch
Publiceringsår: 2008
Språk: Engelska
Sidor: 165-169
Publikation/Tidskrift/Serie: Nature Photonics
Volym: 2
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: Nature Publishing Group


For a fundamental understanding of ultrafast dynamics in chemistry, biology and materials science it has been a long-standing dream to record a molecular movie in which both the atomic trajectories and the chemical states of every atom in matter are followed in real time(1). Free- electron lasers provide this perspective as they deliver brilliant femtosecond X-ray pulses spanning a wide photon energy range, which is necessary to gather element- specific and chemical- stateselective information with femtosecond time resolution. The key challenge lies in synchronizing the free- electron lasers with separate optical lasers. We exploit the peak brilliance of the free- electron laser in Hamburg(2,3) ( FLASH) and establish X- raypulseinduced transient changes of the optical reflectivity in GaAs as a powerful tool for X- ray/ optical cross- correlation. This constitutes a breakthrough in the path towards recording a molecular movie and - equally importantly - opens up the field of femtosecond X- ray- induced dynamics, only accessible with high- brilliance X- ray free- electron lasers.


  • Physical Sciences
  • Natural Sciences


  • ISSN: 1749-4885

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