https://doi.org/10.1140/epjd/e2004-00180-5
Abstraction and insertion mechanisms in reactive collisions of H2+ and D2+ with O-
1
Unité FYAM, Département de Physique, Université
Catholique de Louvain, Chemin du cyclotron 2, 1348
Louvain-La-Neuve, Belgium
2
LCAR UMR 5589, Université Paul
Sabatier-Toulouse III, 118 route de Narbonne, bâtiment IIIR1b4, 31062
Toulouse Cedex 4, France
Corresponding author: a urbain@fyam.ucl.ac.be
Received:
31
March
2004
Revised:
4
October
2004
Published online:
6
December
2004
Integral cross-sections were measured for the associative
ionisation and reactive ionisation in collisions of H
and
D 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.
PACS: 82.30.Nr – Association, addition, insertion, cluster formation / 31.10.+z – Theory of electronic structure, electronic transitions, and chemical binding / 95.30.Ft – Molecular and chemical processes and interactions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
