Abstract
The dissociation of fast ionic hydrogen clusters H[sub [ital n]][sup +] by collision with helium atoms has been studied for various incident cluster masses ([ital n]=5,7,...,31) at 60 keV/amu energy. Absolute dissociation cross sections have been measured. No shell effect is observed. As expected, the cluster dissociation cross section increases with [ital n] but exhibits a quasilinear dependence in contrast with the [ital n][sup 2/3] dependence previously observed [M. Chevallier [ital et] [ital al]., Z. Phys. D 2, 87 (1986)] with argon atoms in the same velocity range.
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