Negative ions as a probe to study the relaxation of clusters and molecules as a function of the excitation energy

We have investigated the effect of the reaction window for the energy deposition in molecules or clusters with various projectiles (H+, F+, Cl+) in collision induced dissociation under energy control (CIDEC). The formation dynamics of scattered negative ions in such collision is discussed. We have measured the production rate of Cl- ions in Cl+ + C60 collisions at 18 keV to be 4%. This rate is compared to previous results obtained with Fq+ (q=1-3) projectile ions. The CIDEC method has been extended to neutral projectiles (F0) and we report on the choice of the projectile to control the amount of the energy deposited in the molecules or the clusters. Results on the excitation energy distributions of C60+ and C602+ are presented.

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