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SYLA: Symposium Laboratory Astrophysics
SYLA 2: Laboratory Astrophysics
SYLA 2.5: Hauptvortrag
Montag, 14. März 2022, 18:00–18:30, Audimax
Exploring the Femtosecond Dynamics of Polycyclic Aromatic Hydrocarbons Using XUV FEL Pulses — •Jason Lee1,2, Denis Tikhonov1,3, Bastian Manschwetus1, and Melanie Schnell1,3 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany. — 2The Chemistry Research Laboratory, University of Oxford, Oxford, United Kingdom. — 3Institute of Physical Chemistry, Christian-Albrechts-Universität zu Kiel, Kiel, Germany.
Satellite infrared measurements show signatures of aromatic vibrations in practically every corner of the universe, attributed to polycyclic aromatic hydrocarbons (PAHs) in the interstellar medium (ISM). These PAHs account for up to 20% of carbon in space and have long been proposed as carriers of the Diffuse Interstellar Bands and Unidentified Infrared Bands.
Given their abundance, PAHs have been the subject of laboratory experiments for many decades, exploring their interaction with a wide range of photon energies. Our experiments utilise XUV pulses at 30.3 nm (40.9 eV) from the Free-Electron-Laser FLASH at DESY, Hamburg to replicate some of the harsh radiation of the ISM. The femtosecond laser pulses allow us to investigate the ultrafast relaxation and fragmentation of PAHs. Combining the ion time-of-flight data, ion imaging data and electron imaging data provides a detailed insight into the various molecular processes occurring after the initial photoionisation.