XUV excitation followed by ultrafast non-adiabatic relaxation in PAH molecules as a femto-astrochemistry experiment
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 f...
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| Hauptverfasser: | , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
13 August 2015
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| In: |
Nature Communications
Year: 2015, Jahrgang: 6 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms8909 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1038/ncomms8909 Verlag, lizenzpflichtig, Volltext: https://www.nature.com/articles/ncomms8909 
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| Verfasserangaben: | 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. Vrakking & F. Lépine |
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| 520 | |a 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. | ||
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