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Article Dans Une Revue International Journal of Mass Spectrometry Année : 2015

Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons

Michael Gatchell
Henning Schmidt
Henning Zettergren

Résumé

We have observed significant differences in the fragmentation patterns of isomeric Polycyclic Aromatic Hydrocarbon (PAH) cations following collisions with helium atoms at center-of-mass energies around 100 eV. This is in contrast to the situation at other collision energies or in photo-absorption experiments where isomeric effects are very weak and where the lowest-energy dissociation channels (H- and C2H2-loss) dominate in statistical fragmentation processes. In the 100 eV range, non-statistical fragmentation also competes and is uniquely linked to losses of single carbon atoms (CHx-losses). We find that such CHx-losses are correlated with the ionic ground state energy within a given group of isomers. We present results for three C16H10+, four C18H12+ and five C20H12+ isomers colliding with He.
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hal-01233614 , version 1 (23-05-2024)

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Mark Stockett, Michael Gatchell, Nathalie de Ruette, Linda Giacomozzi, Tao Chen, et al.. Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons. International Journal of Mass Spectrometry, 2015, 392, pp.58-62. ⟨10.1016/j.ijms.2015.09.005⟩. ⟨hal-01233614⟩
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