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XUV excitation followed by ultrafast non-adiabatic relaxation in PAH molecules as a femto-astrochemistry experiment

Author

Listed:
  • A. Marciniak

    (Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306)

  • V. Despré

    (Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306)

  • T. Barillot

    (Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306)

  • A. Rouzée

    (Max-Born-Institut)

  • M.C.E. Galbraith

    (Max-Born-Institut)

  • J. Klei

    (Max-Born-Institut)

  • C.-H. Yang

    (Max-Born-Institut)

  • C.T.L. Smeenk

    (Max-Born-Institut)

  • V. Loriot

    (Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306)

  • S. Nagaprasad Reddy

    (School of Chemistry, University of Hyderabad)

  • A.G.G.M. Tielens

    (Leiden Observatory, Leiden University)

  • S. Mahapatra

    (School of Chemistry, University of Hyderabad)

  • A. I. Kuleff

    (Theoretische Chemie, PCI, Universität Heidelberg)

  • M.J.J. Vrakking

    (Max-Born-Institut)

  • F. Lépine

    (Institut Lumière Matière, Université Lyon 1, CNRS, UMR 5306)

Abstract

Highly excited molecular species are at play in the chemistry of interstellar media and are involved in the creation of radiation damage in a biological tissue. Recently developed ultrashort extreme ultraviolet light sources offer the high excitation energies and ultrafast time-resolution required for probing the dynamics of highly excited molecular states on femtosecond (fs) (1 fs=10−15s) and even attosecond (as) (1 as=10−18 s) timescales. Here we show that polycyclic aromatic hydrocarbons (PAHs) undergo ultrafast relaxation on a few tens of femtoseconds timescales, involving an interplay between the electronic and vibrational degrees of freedom. Our work reveals a general property of excited radical PAHs that can help to elucidate the assignment of diffuse interstellar absorption bands in astrochemistry, and provides a benchmark for the manner in which coupled electronic and nuclear dynamics determines reaction pathways in large molecules following extreme ultraviolet excitation.

Suggested Citation

  • A. Marciniak & V. Despré & T. Barillot & A. Rouzée & M.C.E. Galbraith & J. Klei & C.-H. Yang & C.T.L. Smeenk & V. Loriot & S. Nagaprasad Reddy & A.G.G.M. Tielens & S. Mahapatra & A. I. Kuleff & M.J.J., 2015. "XUV excitation followed by ultrafast non-adiabatic relaxation in PAH molecules as a femto-astrochemistry experiment," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8909
    DOI: 10.1038/ncomms8909
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    Cited by:

    1. J. W. L. Lee & D. S. Tikhonov & P. Chopra & S. Maclot & A. L. Steber & S. Gruet & F. Allum & R. Boll & X. Cheng & S. Düsterer & B. Erk & D. Garg & L. He & D. Heathcote & M. Johny & M. M. Kazemi & H. K, 2021. "Time-resolved relaxation and fragmentation of polycyclic aromatic hydrocarbons investigated in the ultrafast XUV-IR regime," Nature Communications, Nature, vol. 12(1), pages 1-11, December.

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