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Article Dans Une Revue Nature Communications Année : 2018

Acetylacetone photodynamics at a seeded free-electron laser

M. Sapunar
  • Fonction : Auteur
A. Ponzi
  • Fonction : Auteur
R. Richter
  • Fonction : Auteur
A. Kivimäki
  • Fonction : Auteur
O. Plekan
  • Fonction : Auteur
P. Finetti
  • Fonction : Auteur
C. Callegari
  • Fonction : Auteur
K. Prince
P. Decleva
  • Fonction : Auteur
J. Eland
  • Fonction : Auteur
N. Došlić
  • Fonction : Auteur

Résumé

The first steps in photochemical processes, such as photosynthesis or animal vision, involve changes in electronic and geometric structure on extremely short time scales. Time-resolved photoelectron spectroscopy is a natural way to measure such changes, but has been hindered hitherto by limitations of available pulsed light sources in the vacuum-ultraviolet and soft X-ray spectral region, which have insufficient resolution in time and energy simultaneously. The unique combination of intensity, energy resolution, and femtosecond pulse duration of the FERMI-seeded free-electron laser can now provide exceptionally detailed information on photoexcitation–deexcitation and fragmentation in pump-probe experiments on the 50-femtosecond time scale. For the prototypical system acetylacetone we report here electron spectra measured as a function of time delay with enough spectral and time resolution to follow several photoexcited species through well-characterized individual steps, interpreted using state-of-the-art static and dynamics calculations. These results open the way for investigations of photochemical processes in unprecedented detail.
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Dates et versions

hal-02335983 , version 1 (03-07-2024)

Identifiants

Citer

R. J Squibb, M. Sapunar, A. Ponzi, R. Richter, A. Kivimäki, et al.. Acetylacetone photodynamics at a seeded free-electron laser. Nature Communications, 2018, 9 (1), pp.63. ⟨10.1038/s41467-017-02478-0⟩. ⟨hal-02335983⟩
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