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Fragmentation Dynamics of Triatomic Molecules : Contribution of Geometry

Abstract : The dynamics of the fragmentation process, rather simple for diatomic molecules, becomes more interesting in the case of poly-atomic molecules due to the coupling between the additional internal degrees of freedom (bending, stretching...). In order to reveal the role of these contributions, we studied several bent triatomic molecules (NO2, H2O, D2O, HDO). Ion-impact induced fragmentation of molecule is a well adapted way to observe the momentum sharing among atoms in a molecule due to a short interaction time (10-18s). A first study of carbon dioxide CO2 fragmentation induced by collision with 8 MeV/u Ni24+ has shown that the fragmentation dynamics of molecular ion CO2q+ can be categorized as synchronous concerted fragmentation (q=3) or asynchronous concerted fragmentation (q=2), i.e. fragmentation through an intermediate asymmetric vibration mode. We have conducted experiments with NO2, D2O, H2O and HDO target molecules in order to test this behaviour in the more general case of molecules with a bond angle. In the case of NO22+, induced by 4.7Mev/u Ne8+, clear differences, compared to CO22+ fragmentation have been observed. In the case of HDO2+ fragmentation, the strong selectivity of bond cleavage has been confirmed and a new branching ratio (H++OD+)/(D++OH+)=5.7±0.1 measured.
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Contributor : Tomoko Muranaka <>
Submitted on : Tuesday, February 15, 2011 - 1:15:52 AM
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  • HAL Id : tel-00565897, version 1


Tomoko Muranaka. Fragmentation Dynamics of Triatomic Molecules : Contribution of Geometry. Atomic Physics [physics.atom-ph]. Université de Caen, 2007. English. ⟨tel-00565897⟩



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