Abstract
This report presents measurements on ion-irradiated single-crystals of lithium fluoride (LiF) by means of scanning force microscopy (SFM), complementing studies performed with optical spectroscopy, small-angle X-ray scattering, and surface profilometry. Freshly cleaved crystals were irradiated at room temperature with Au-, Bi- and U-ions (kinetic energies up to 11.4 MeV/u) at the linear accelerator UNILAC, and with 1.4 MeV/u Ni-, Sn-, Xe- and Au-ions at the high-charge injector HLI, both operated at GSI. Continuing previous SFM studies of small hillocks induced by single-ion impact, the hillock diameters vs. energy loss were reexamined with special regard to systematic errors arising from the finite sensor tip radius. Furthermore, on LiF (100) surfaces irradiated at grazing incidence, SFM images show linear latent tracks exhibiting a pearl chain of hillock-like protruding zones. They are reminiscent of the sequences of etch pits found by SFM after etching a LiF surface exposed by cleavage parallel to the ion trajectories.
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