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Hydrogenated pyrene: Statistical single-carbon loss below the knockout threshold

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Abstract

An ongoing discussion revolves around the question of what effect hydrogenation has on carbon backbone fragmentation in polycyclic aromatic hydrocarbons (PAHs). In order to shed more light on this issue, we have measured absolute single carbon loss cross sections in collisions between native or hydrogenated pyrene cations (C16H+ 10+m , m = 0, 6, 16) and He as functions of center-of-mass energies down to 20 eV. Classical molecular dynamics (MD) simulations give further insight into energy transfer processes and also yield m-dependent threshold energies for prompt (femtoseconds) carbon knockout. Such fast, non-statistical fragmentation processes dominate CH x -loss for native pyrene (m = 0), while much slower statistical fragmentation processes contribute significantly to single-carbon loss for the hydrogenated molecules (m = 6 and m = 16). The latter is shown by measurements of large CH x -loss cross sections far below the MD knockout thresholds for C16H+ 16 and C16H+ 26.

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Authors and Affiliations

  1. Department of Physics, Stockholm University, Stockholm, 106 91, Sweden

    Michael Wolf, Linda Giacomozzi, Michael Gatchell, Nathalie de Ruette, Mark H. Stockett, Henning T. Schmidt, Henrik Cederquist & Henning Zettergren

  2. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus, Denmark

    Mark H. Stockett

Authors
  1. Michael Wolf
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  2. Linda Giacomozzi
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  3. Michael Gatchell
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  4. Nathalie de Ruette
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  5. Mark H. Stockett
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  6. Henning T. Schmidt
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  7. Henrik Cederquist
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  8. Henning Zettergren
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Correspondence to Michael Wolf.

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Wolf, M., Giacomozzi, L., Gatchell, M. et al. Hydrogenated pyrene: Statistical single-carbon loss below the knockout threshold. Eur. Phys. J. D 70, 85 (2016). https://doi.org/10.1140/epjd/e2016-60735-3

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  • DOI: https://doi.org/10.1140/epjd/e2016-60735-3

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