Number of electrons active in slow collisions of \(\) and \(\) with \(\)
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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 versusr for each s value corresponding to peripheral collisions, i.e.s=1−4 for O8+ and s=1−7 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(8− r )+ and Ar(8− r )+.
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