Multiple ionisation of rare gases by high-energy uranium ions

Abstract. Multiple ionisation cross sections u ( q) for the production of recoil ions in charge state q by 120 MeV U- ' U90+ impact have been measured for Ne, Ar and Kr targets using a recoil-ion-projectile-electron triple-coincidence technique. The data are compared with previously measured cross sections for U-ion impact in the projectile energy (E,) range from 1.4 to 420 MeV U-'. For low recoil-ion charge states a(q) decreases over the whole E, range somewhat more slowly than l /E, , whereas for higher recoil-ion charge states a(q) reaches a maximum at about 10-15 MeVu-'. The data are nicely described by parameter-free n-body Classical Trajectory Monte Carlo ( ~ C T M C) calculations. The calcu-lations indicate the importance of accounting for the Auger events in the description of the multiple ionisation process. Because of the smooth E, dependence of "(4) towards high E, , the development of a recoil-ion source using a primary U-ion beam in a storage ring for the production of high charge state recoil-ions appears to be feasible. 1.

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