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Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2015

Failure of hydrogenation in protecting polycyclic aromatic hydrocarbons from fragmentation

Résumé

A recent study of soft x-ray absorption in native and hydrogenated coronene cations, C_24H_12+m^+ m=0–7, led to the conclusion that additional hydrogen atoms protect (interstellar) polycyclic aromatic hydrocarbon (PAH) molecules from fragmentation [Reitsma et al., Phys. Rev. Lett. 113, 053002 (2014)]. The present experiment with collisions between fast (30–200 eV) He atoms and pyrene (C_16H_10+m^+, m=0, 6, and 16) and simulations without reference to the excitation method suggests the opposite. We find that the absolute carbon-backbone fragmentation cross section does not decrease but increases with the degree of hydrogenation for pyrene molecules.

Dates et versions

hal-01236904 , version 1 (02-12-2015)

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M. Gatchell, M. H. Stockett, N. de Ruette, T. Chen, L. Giacomozzi, et al.. Failure of hydrogenation in protecting polycyclic aromatic hydrocarbons from fragmentation. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2015, 92 (5), pp.050702(R). ⟨10.1103/PhysRevA.92.050702⟩. ⟨hal-01236904⟩
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