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Cluster and velocity effects on yields and kinetic energy distributions of Li+ desorbed from LiF.

MeV N+ and N2+ ions were used to induce Li+ desorption from LiF. The contributions due to elastic atomic collisions and electronic excitation processes to the sputtering yield could be unambiguously separated. In the case of N2+ ions, a Li+ yield enhancement, i.e., Y(N2+)>2Y(N+), was found only for the electronic process. The maximum sputtering yield was observed in a projectile velocity range where the projectile electronic energy loss still increases. These results are simultaneously explained using the radial distribution of the deposited energy rather than the electronic energy loss.