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Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions

Abstract : The interaction of multiply charged ions (He(2+), O(3+), and Xe(20+)) with gas-phase pericondensed polycyclic aromatic hydrocarbon (PAH) molecules of coronene (C(24)H(12)) and pyrene (C(16)H(10)) is studied for low-velocity collisions (v <= 0.6 a.u.). The mass spectrometric analysis shows that singly and up to quadruply charged intact molecules are important reaction products. The relative experimental yields are compared with the results of a simple classical over-the-barrier model. For higher molecular charge states, the experimental yields decrease much more strongly than the model predictions due to the instabilities of the multiply charged PAH molecules. Even-odd oscillations with the number of carbon atoms, n, in the intensity distributions of the C(n)H(x)(+) fragments indicate a linear chain structure of the fragments similar to those observed for ion-C(60) collisions. The latter oscillations are known to be due to dissociation energy differences between even-and odd-n C(n)-chain molecules. For PAH molecules, the average numbers of H atoms attached to the C(n)H(x) chains are larger for even-n reflecting acetylenic bond systems.
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https://hal.archives-ouvertes.fr/hal-01215266
Contributor : Patrick Rousseau Connect in order to contact the contributor
Submitted on : Tuesday, October 13, 2015 - 5:50:17 PM
Last modification on : Tuesday, October 4, 2022 - 4:00:27 PM

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A. Ławicki, A. I. S. Holm, Patrick Rousseau, M. Capron, R. Maisonny, et al.. Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions. Physical Review A : Atomic, molecular, and optical physics, 2011, 83 (2), pp.022704. ⟨10.1103/PhysRevA.83.022704⟩. ⟨hal-01215266⟩

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