https://doi.org/10.1007/s100530170226
Multi-ionization cross-sections of small ionic carbon clusters by particle impact as a tool to investigate their shapes
1
Institut de Physique Nucléaire, Université Paris-Sud, 91406 Orsay Cedex, France
2
Groupe de Physique des solides (UMR 7588 du CNRS) , Université Paris 6/7, Paris Cedex 05, France
3
Laboratoire de Physique des Gaz et des Plasmas (UMR 8578 du CNRS) , Université Paris-Sud, 91405 Orsay Cedex,
France
4
Laboratoire CAR/IRSAMC (UMR 5589 du CNRS) , Université Paul Sabatier, 31062 Toulouse Cedex, France
5
Laboratoire de Physique Quantique/IRSAMC (UMR 5626 du CNRS) , Université Paul Sabatier, 31062 Toulouse
Cedex, France
Corresponding author: a Wohrer@gps.jussieu.fr
Received:
1
December
2000
Published online: 15 April 2001
Single, double and triple ionization cross-sections of C
clusters in
collisions with helium atoms at intermediate velocity (2.6 a.u.) have been
measured (
). The relative multi-ionization cross-sections (double
over single and triple over single) are first increasing with n, then
decreasing when going from n=4 to n=5. We show, on the basis of an
independent atom and electron collisional treatment, that this effect is
attributable to a change in the cluster shape. The role of the cluster
compactness on relative multi-ionization cross-sections is pointed out here
for the first time.
PACS: 34.50.Fa – Electronic excitation and ionization of atoms (including beam-foil excitation and ionization) / 34.50.Gb – Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 34.10.+x – General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.) / 36.40.Mr – Spectroscopy and geometrical structure of custers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
