Number of electrons active in slow collisions of O8+ and Ar8+ with C60
Laboratoire de Spectrométrie Ionique et Moléculaire, Université Lyon 1, Campus de la Doua, 69622 Villeurbanne Cedex, France
Revised: 28 February 2000
Published online: 15 October 2000
Electron multiplicity has been measured for collisions of O8+ and Ar8+ with C60 fullerene in coincidence with the number of electrons stabilized on the projectile. Measurements have been performed at the same velocity v=0.24 a.u. for both systems. The number of active electrons r is deduced from the number of stabilized electrons s and the number of ejected electrons n. The kinetic energy spectra of outgoing projectiles are different for collisions "outside"the C60 cage which show a narrow peak and collisions "inside"the C60 cage which show a broad shifted energy loss peak. The cross-sections for stabilization of s electrons have been measured versus r for each s value corresponding to peripheral collisions, i.e. for O8+ and for Ar8+. Their sum over s, the total cross-section , shows a similar behavior for Ar8+ and O8+ up to r=10. It gives a clear indication of identical multicapture processes for these two systems. The very different s number distribution is interpreted by the different relaxation modes of the multiply excited states of O and Ar.
PACS: 36.40.Qv – Stability and fragmentation of clusters / 34.70.+e – Charge transfer
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000