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Fragmentation de la molécule C60 par impact d'ions légers étudiée en multicorrélation.Sections efficaces, spectroscopie d'électrons

Arnaud Rentenier 1
1 I²M - Interactions Ions-Matière (LCAR)
LCAR - Laboratoire Collisions Agrégats Réactivité
Abstract : A quantitative study of the C60 fullerene fragmentation in collision with light ions (Hn=1,2,3+, Heq=1,2+, in the velocity range 0,1 - 2,3 u.a.) is presented. The multicorrelation technique, developed between fragment ions and electrons with well defined energy, has enlightened some of the dependences and properties of fragmentation mechanisms (cross sections, electron spectroscopy, size distributions, kinetic energy of fragment ions, Campi's scatter plot, activation energies). The deposited energy hence appeared as an important parameter. Cross sections have been measured, for the first time, for all the collisionnal processes. Ionisation and capture only depends on the collision velocity. On the other hand, scaling laws with the deposited energy have been observed for the cross sections of multifragmentation, which depends on the collision energy and the nature of the projectile. The deposited energy has also been found as an essential parameter to understand the evolution of the charged fragment size distributions. The electron spectroscopy, achieved at an emission angle of 35°, showed spectra peaked at important energies (from 5 to 20 eV). The spectra shape depends on the collision velocity. A first theoretical analysis points out the link between the observed energy distribution and the presence of a centrifugal potential barrier. Finally, correlation experiments between produced ions and electron energy reveal that electron energy increases with internal energy.
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Submitted on : Wednesday, June 2, 2004 - 10:38:32 AM
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  • HAL Id : tel-00006179, version 1

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Arnaud Rentenier. Fragmentation de la molécule C60 par impact d'ions légers étudiée en multicorrélation.Sections efficaces, spectroscopie d'électrons. Physique Atomique [physics.atom-ph]. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00006179⟩

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