Acetylacetone photodynamics at a seeded free-electron laser

R. J. Squibb, M. Sapunar, A. Ponzi, R. Richter, A. Kivimäki, O. Plekan, P. Finetti, N. Sisourat, V. Zhaunerchyk, T. Marchenko, L. Journel, R. Guillemin, R. Cucini, M. Coreno, C. Grazioli, M. Fraia, C. Callegari, K. C. Prince, P. Decleva, M. Simon, J. H. D. Eland, N. Došlić, R. Feifel and M. N. Piancastelli ()
Additional contact information
R. J. Squibb: University of Gothenburg
M. Sapunar: Institut Ruđer Bošković
A. Ponzi: Institut Ruđer Bošković
R. Richter: Elettra-Sincrotrone Trieste
A. Kivimäki: Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali
O. Plekan: Elettra-Sincrotrone Trieste
P. Finetti: Elettra-Sincrotrone Trieste
N. Sisourat: Laboratoire de Chimie Physique-Matière et Rayonnement
V. Zhaunerchyk: University of Gothenburg
T. Marchenko: Laboratoire de Chimie Physique-Matière et Rayonnement
L. Journel: Laboratoire de Chimie Physique-Matière et Rayonnement
R. Guillemin: Laboratoire de Chimie Physique-Matière et Rayonnement
R. Cucini: Elettra-Sincrotrone Trieste
M. Coreno: Elettra-Sincrotrone Trieste
C. Grazioli: Elettra-Sincrotrone Trieste
M. Fraia: Elettra-Sincrotrone Trieste
C. Callegari: Elettra-Sincrotrone Trieste
K. C. Prince: Elettra-Sincrotrone Trieste
P. Decleva: Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali
M. Simon: Laboratoire de Chimie Physique-Matière et Rayonnement
J. H. D. Eland: University of Gothenburg
N. Došlić: Institut Ruđer Bošković
R. Feifel: University of Gothenburg
M. N. Piancastelli: Laboratoire de Chimie Physique-Matière et Rayonnement

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-017-02478-0

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