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| HAL : hal-00268350, version 1 |
| arXiv : 0803.4505 |
| DOI : 10.1063/1.2884862 |
| Fiche détaillée |  Récupérer au format |
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| The Journal of Chemical Physics 128 (2008) 124312 |
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| Fragmentation branching ratios of highly excited hydrocarbon molecules CnH and their cations CnH+ (n<5) |
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| T. Tuna 1M. Chabot 1 |
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| (28/03/2008) |
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| We have measured fragmentation branching ratios of neutral CnH and CnH+ cations produced in high velocity (4.5 a.u) collisions between incident CnH+ cations and helium atoms. Electron capture gives rise to excited neutral species CnH and electronic excitation to excited cations CnH+. Thanks to a dedicated set-up, based on coincident detection of all fragments, the dissociation of the neutral and cationic parents were recorded separately and in a complete way. For the fragmentation of CnH, the H-loss channel is found to be dominant, as already observed by other authors. By contrast, the H-loss and C-loss channels equally dominate the two-fragment break up of CnH+ species. For these cations, we provide the first fragmentation data (n > 2). Results are also discussed in the context of astrochemistry. |
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| 1 : | Institut de Physique Nucléaire d'Orsay (IPNO) |
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CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud |
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| 2 : | Laboratoire de Photophysique Moléculaire (PPM) |
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CNRS : UPR3361 – Université Paris XI - Paris Sud |
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| 3 : | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM) |
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CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud |
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| 4 : | Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes |
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Université Paul Sabatier [UPS] - Toulouse III |
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| 5 : | Laboratoire des collisions atomiques et moléculaires (LCAM) |
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CNRS : UMR8625 – Université Paris XI - Paris Sud |
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| 6 : | Institut des Nanosciences de Paris (INSP) |
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CNRS : UMR7588 – Université Pierre et Marie Curie [UPMC] - Paris VI |
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| 7 : | Laboratoire de Chimie Physique D'Orsay (LCPO) |
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CNRS : UMR8000 – Université Paris XI - Paris Sud |
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| Domaine | : | Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique Physique/Physique/Agrégats Moléculaires et Atomiques |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00268350, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00268350 | |
| oai:hal.archives-ouvertes.fr:hal-00268350 | |
| Contributeur : Karine Wohrer-Béroff | |
| Soumis le : Lundi 31 Mars 2008, 17:56:19 | |
| Dernière modification le : Jeudi 3 Avril 2008, 15:44:37 | |
