HEAVY-ION-INDUCED MULTIPLE IONIZATION IN GOLD

The L X-ray spectra of Au in collision with carbon and oxygen projecti les in the energy range of 0.25 to 0.75 MeV amu-1 have been measured. From the energy shifts and the yield-ratio shifts of the L1, L(alpha), L(eta) and L(gamma1) lines relative to those for the 3.5 MeV proton b ombardment, the experimental values for the multiple ionisation probab ilities p(M4,5) and p(N4) as a function of the projectile energy have been determined. The results show that the geometrical model of Sulik et al. provide a much better description of the heavy ion data than th e first-order theory of McGuire and Richard.