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

T. Tuna; M. Chabot; T. Pino; P. Désesquelles; A. Lepadellec; G. .Martinet; M. Barat; B. Lucas; F. Mezdari; L. Montagnon; N.T. Van-Oanh; L. Lavergne; A. Lachaize; Y. Carpentier; K. Béroff

HAL : hal-00268350, version 1

arXiv : 0803.4505

DOI : 10.1063/1.2884862

Fiche détaillée

Récupérer au format

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

(28/03/2008)

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

Domaine

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique

Physique/Physique/Agrégats Moléculaires et Atomiques

Liste des fichiers attachés à ce document :

PDF

tuna_2008.pdf

(475.8 KB)


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