Abstract
BaF 2 and LaF 3 single crystals were irradiated with different ions from Ne to U having energies between 1.4 and 13.3 MeV/u and were subsequently analyzed with scanning force microscopy (SFM), optical spectroscopy and surface profilometry. Similar to numerous other ionic crystals, ion-induced hillocks were observed by SFM, the mean size on the nanometer scale depending on the electronic energy loss. BaF 2 shows optical color-center absorption spectra, which consist of broad bands ascribed to F-center aggregates, whereas LaF 3 does not exhibit any specific absorption bands. Depending on the beam parameters (energy, fluence, etc.), the irradiation of both crystals leads to more or less pronounced out-of-plane swelling. In order to study the thermal behaviour of ion-induced modifications, isochronal annealing has been performed. Both crystals show a decrease of the relative step height and the areal density of the hillocks with increasing temperature.
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