Université Paul Sabatier - Bat. 3R1b4 - 118 route de Narbonne 31062 Toulouse Cedex 09, France

Accueil > Publications > Publications par année > Année 2004

Abstraction and insertion mechanisms in reactive collisions between H2+ or D2+ and O-

Integral cross-sections were measured for the associative ionisation and reactive ionisation in collisions of H2 + and D2 + with O- by means of a merged-beam set-up operating with keV beams. The magnitude of the reactive cross-sections is quite large (10-14 cm2 at 10 meV), and surpasses the associative ionisation by an order of magnitude. The observed ratio is discussed in terms of insertion and abstraction mechanisms that prevail in the case of atom-diatom inelastic collisions. These measurements may be relevant to the understanding of some astrophysical objects such as the comets, where the presence of the water cation was highlighted.

doi : 10.1140/epjd/e2004-00180-5

Voir en ligne : Eur. Phys. J. D 31, 469-75 (2004)