Semiclassical calculations of charge exchange and excitation in Na+-Li and Li+-Na collisions using atomic-orbital expansions

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Charge transfer and excitation cross sections are calculated for Na++Li to or from Na+Li+ collisions. Large bases consisting of travelling atomic orbitals on both centres are employed for a range of projectile velocities 0.1<or= nu <or=1.4 (au). For low velocities ( nu <0.25) good agreement is found with the recent molecular-orbital calculations of Allan and Hanssen (1985). For velocities lying beyond 0.25 the authors predict lower cross sections, partly because a common translational factor was used in the molecular-orbital calculations. The authors also find good qualitative agreement with the experimental data of Daley and Perel (1969), which shows the oscillatory structure to be present in the velocity dependence of the charge transfer.