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Coupled-subshell approximation for L-shell ionisation

The ionisation probability for target L subshells by light ion impact is calculated in the semiclassical approximation, including the couplings between the subshells during the collision. The inclusion of these couplings is found to modify the subshell occupation numbers only slightly for proton and alpha particle impact on heavy target atoms, but a marked effect is found for heavier projectiles. Numerical results for the systems He+Pt, Ne+Pt and Ne+Yb are presented.