Fragmentation branching ratios of highly excited hydrocarbon molecules CnH and their cations CnH+ (n<5)

Abstract : 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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T. Tuna, M. Chabot, T. Pino, P. Désesquelles, A. Lepadellec, et al.. Fragmentation branching ratios of highly excited hydrocarbon molecules CnH and their cations CnH+ (n<5). The Journal of Chemical Physics, American Institute of Physics, 2008, 128, pp.124312. <10.1063/1.2884862>. <hal-00268350>

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