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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 (He2+, O3+, and Xe20+) with gas-phase pericondensed polycyclic aromatic hydrocarbon (PAH) molecules of coronene (C24H12) and pyrene (C16H10) 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 CnHx+ fragments indicate a linear chain structure of the fragments similar to those observed for ion-C60 collisions. The latter oscillations are known to be due to dissociation energy differences between even- and odd-n Cn-chain molecules. For PAH molecules, the average numbers of H atoms attached to the CnHx chains are larger for even-n reflecting acetylenic bond systems.
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https://hal.archives-ouvertes.fr/hal-00566307
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Submitted on : Tuesday, February 15, 2011 - 8:53:24 PM
Last modification on : Tuesday, October 4, 2022 - 4:00:27 PM

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  • HAL Id : hal-00566307, version 1

Citation

Arkadiusz Lawicki, A. I. S. Holm, Patrick Rousseau, Michaël Capron, Rémy 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, pp.022704. ⟨hal-00566307⟩

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