ENERGY GAIN IN COLLISIONS OF HIGHLY-CHARGED IONS WITH C-60

We have extended the recently developed dynamical classical over-barri er model for charge transfer in soft ion-cluster collisions in order t o simulate the projectile kinetic energy gain of 3.3q-keV Arq+ ions in large-impact-parameter collisions with neutral C-60 targets. Our semi classical theory allows for the direct calculation of the energy defec t Q and of the projectile kinetic-energy gain in two different ways: e ither as difference of electronic binding energies before and after th e collision or by integration of the dynamically varying force between the collision partners along the trajectory. A comparison between the two ways provides an intrinsic test of the model calculations. A comp arison with recent experimental data shows good agreement in the main features of the projectile energy gain spectra and facilitates their i nterpretation in terms of the number of transferred electrons and proj ectile shells into which electrons are captured. [S1050-2947(97)04512- 5].