Phys. Rev. Lett. 84, 5904–5907 (2000)Cluster and Velocity Effects on Yields and Kinetic Energy Distributions of Li+ Desorbed from LiFReceived 30 August 1999; published in the issue dated 19 June 2000 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5904
DOI:
10.1103/PhysRevLett.84.5904
PACS:
79.20.Rf, 61.80.Lj
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