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Preprint PUBDB-2024-05030
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Ultrafast dynamics of fluorene initiated by highly intense laser fields

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2024

[10.26434/chemrxiv-2023-18w5m-v3]  GO

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Abstract: We present an investigation of the ultrafast dynamics of the polycyclic aromatic hydrocarbon fluorene initiated by an intense femtosecond near- infrared laser pulse (810 nm) and probed by a weak visible pulse (405 nm). Using a multichannel detection scheme (mass spectra, electron and ion velocity-map imaging), we provide a full disentanglement of the complex dynamics of the vibronically excited parent molecule, its excited ionic states, and fragments. We observed various channels resulting from the strong-field ionization regime. In particular, we observed the formation of the unstable tetracation of fluorene, above-threshold ionization features in the photoelectron spectra, and evidence of ubiquitous secondary fragmentation. We produced a global fit of all observed time-dependent photoelectron and photoion channels. This global fit includes four parent ions extracted from the mass spectra, 15 kinetic-energy-resolved ionic fragments extracted from ion velocity map imaging, and five photoelectron channels obtained from electron velocity map imaging. The fit allowed for the extraction of 60 lifetimes of various metastable photoinduced intermediates.

Contributing Institute(s):
  1. Spectroscopy of molecular processes (FS-SMP)
  2. CFEL-CMI (FS-CFEL-CMI)
  3. Strukturdynamik Chemischer Systeme (FS-SCS)
  4. Experimentebetreuung FLASH (FS-FL)
  5. Laser Forschung und Entwicklung (FS-LA)
Research Program(s):
  1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
  2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
  3. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
  4. ASTROROT - Unraveling interstellar chemistry with broadband microwave spectroscopy and next-generation telescope arrays (638027) (638027)
  5. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)
  6. FS-Proposal: F-20170540 (F-20170540) (F-20170540)
  7. FS-Proposal: F-20211752 (F-20211752) (F-20211752)
Experiment(s):
  1. FLASH Beamline BL1 (FLASH)

Appears in the scientific report 2024
Database coverage:
Creative Commons Attribution CC BY 4.0 ; OpenAccess ; Published
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Private Collections > >DESY > >FS > FS-CFEL-CMI
Private Collections > >DESY > >FS > FS-SMP
Private Collections > >DESY > >FS > FS-SCS
Private Collections > >DESY > >FS > FS-LA
Private Collections > >DESY > >FS > FS-FL
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Ultrafast dynamics of polycyclic aromatic hydrocarbons initiated by highly intense laser fields
Physical chemistry, chemical physics 26(30), 20261-20272 () [10.1039/D3CP05063G]  GO Embargoed OpenAccess  Download fulltext Files BibTeX | EndNote: XML, Text | RIS

 Record created 2024-07-10, last modified 2025-07-23
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