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Acetylacetone photodynamics at a seeded freeelectron laser

Squibb, R. J.; Sapunar, Marin; Ponzi, A.; Richter, R.; Kivimäki, A.; Plekan, O.; Finetti, P.; Sisourat, N.; Zhaunerchyk, V.; Marchenko, T.; Journel, L.; Guillemin, R.; Cucini, R.; Coreno, M.; Grazioli, C.; Di Fraia, M.; Callegari, C.; Prince, K. C.; Decleva, P.; Simon, M.; Eland, J. H. D.; Došlić, Nađa; Feifel, R.; Piancastelli, M. N. (2018) Acetylacetone photodynamics at a seeded freeelectron laser. Nature Communications, 9 (1). ISSN 2041-1723

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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 Xray 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.

Item Type: Article
Uncontrolled Keywords: Acetylacetone ; photodynamics ; seeded free electron laser
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Physical Chemistry
Depositing User: Nađa Došlić
Date Deposited: 18 Jul 2018 11:22
DOI: 10.1038/s41467-017-02478-0

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