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The Journal of Chemical Physics 128 (2008) 124312
Fragmentation branching ratios of highly excited hydrocarbon molecules CnH and their cations CnH+ (n<5)
T. Tuna1, M. Chabot1, T. Pino2, P. Désesquelles3, A. Lepadellec4, G. .Martinet1, M. Barat5, B. Lucas5, F. Mezdari6, L. Montagnon4, N.T. Van-Oanh7, L. Lavergne1, A. Lachaize1, Y. Carpentier2, K. Béroff5

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  PPM - Laboratoire de Photophysique Moléculaire
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes
5 :  LCAM - Laboratoire des collisions atomiques et moléculaires
6 :  INSP - Institut des Nanosciences de Paris
7 :  LCPO - Laboratoire de Chimie Physique D'Orsay
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique

Physique/Physique/Agrégats Moléculaires et Atomiques
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