Time-resolved relaxation and fragmentation of polycyclic aromatic hydrocarbons investigated in the ultrafast XUV-IR regime

Autor: Lee, JWL, Tikhonov, DS, Chopra, P, Maclot, S, Steber, AL, Gruet, S, Allum, F, Boll, R, Cheng, X, Düsterer, S, Erk, B, Garg, D, He, L, Heathcote, D, Johny, M, Kazemi, MM, Köckert, H, Lahl, J, Lemmens, AK, Loru, D, Mason, R, Müller, E, Mullins, T, Olshin, P, Passow, C, Peschel, J, Ramm, D, Rompotis, D, Schirmel, N, Trippel, S, Wiese, J, Ziaee, F, Bari, S, Burt, M, Vallance, C, Brouard, M, Küpper, J, Rijs, AM, Rolles, D, Techert, S, Eng-Johnsson, P, Manschwetus, B, Schnell, M
Přispěvatelé: BioAnalytical Chemistry, AIMMS
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
Nature Communications, 12:6107, 1-11. Nature Publishing Group
Nature Communications
Lee, J W L, Tikhonov, D S, Chopra, P, Maclot, S, Steber, A L, Gruet, S, Allum, F, Boll, R, Cheng, X, Düsterer, S, Erk, B, Garg, D, He, L, Heathcote, D, Johny, M, Kazemi, M M, Köckert, H, Lahl, J, Lemmens, A K, Loru, D, Mason, R, Müller, E, Mullins, T, Olshin, P, Passow, C, Peschel, J, Ramm, D, Rompotis, D, Schirmel, N, Trippel, S, Wiese, J, Ziaee, F, Bari, S, Burt, M, Küpper, J, Rijs, A M, Rolles, D, Techert, S, Eng-Johnsson, P, Brouard, M, Vallance, C, Manschwetus, B & Schnell, M 2021, ' Time-resolved relaxation and fragmentation of polycyclic aromatic hydrocarbons investigated in the ultrafast XUV-IR regime ', Nature Communications, vol. 12, 6107, pp. 1-11 . https://doi.org/10.1038/s41467-021-26193-z
Nature Communications 12(1), 6107 (1-11) (2021). doi:10.1038/s41467-021-26193-z
ISSN: 2041-1723
DOI: 10.1038/s41467-021-26193-z
Popis: Nature Communications 12(1), 6107 (1-11) (2021). doi:10.1038/s41467-021-26193-z
Polycyclic aromatic hydrocarbons (PAHs) play an important role in interstellar chemistry and are subject to high energy photons that can induce excitation, ionization, and fragmentation. Previous studies have demonstrated electronic relaxation of parent PAH monocations over 10���100 femtoseconds as a result of beyond-Born-Oppenheimer coupling between the electronic and nuclear dynamics. Here, we investigate three PAH molecules: fluorene, phenanthrene, and pyrene, using ultrafast XUV and IR laser pulses. Simultaneous measurements of the ion yields, ion momenta, and electron momenta as a function of laser pulse delay allow a detailed insight into the various molecular processes. We report relaxation times for the electronically excited PAH*, PAH$^+$* and PAH$^{2+}$* states, and show the time-dependent conversion between fragmentation pathways. Additionally, using recoil-frame covariance analysis between ion images, we demonstrate that the dissociation of the PAH$^{2+}$ ions favors reaction pathways involving two-body breakup and/or loss of neutral fragments totaling an even number of carbon atoms.
Published by Nature Publishing Group UK, [London]
Databáze: OpenAIRE
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