Deexcitation dynamics of superhydrogenated polycyclic aromatic hydrocarbon cations after soft-x-ray absorption
Por:
Reitsma G., Boschman L., Deuzeman M.J., González-Magaña O., Hoekstra S., Cazaux S., Hoekstra R., Schlathölter T.
Publicada:
1 ene 2014
Categoría:
Physics and Astronomy (miscellaneous)
Resumen:
We have investigated the response of superhydrogenated gas-phase coronene cations upon soft x-ray absorption. Carbon (1s) transitions were resonantly excited at h?=285eV. The resulting core hole is then filled in an Auger decay process, with the excess energy being released in the form of an Auger electron. Predominantly highly excited dications are thus formed, which cool down by hydrogen emission. In superhydrogenated systems, the additional H atoms act as a buffer, quenching loss of native H atoms and molecular fragmentation. Dissociation and transition state energies for several H loss channels were computed by means of density functional theory. Using these energies as input into an Arrhenius-type cascade model, very good agreement with the experimental data is found. The results have important implications for the survival of polyaromatic hydrocarbons in the interstellar medium and reflect key aspects of graphene hydrogenation. © 2014 American Physical Society.
Filiaciones:
Reitsma G.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Boschman L.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700AV Groningen, Netherlands
Deuzeman M.J.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
González-Magaña O.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Hoekstra S.:
Van Swinderen Institute, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Cazaux S.:
Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700AV Groningen, Netherlands
Hoekstra R.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Schlathölter T.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
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