Abstract
We have studied defect creation in alkali halide crystals bombarded with energetic ions. Several kinds of defects are well known in such crystals but each type can be associated with different interaction processes between the incident ion and the target. All these defects may then be used as detectors of the particle-matter interactions. In the case of LiF bombarded with high energy ions (56 MeV alpha-particles and 28 MeV deuterons) the penetration depths are sufficient to obtain the defect profiles along the ion trajectory using an optical microspectrophotometric technique. So the F-center profiles in LiF give a view of Bragg's curve for the electronic stopping power. These F-center profiles have been systematically studied as a function of the incident ion doses between 10 10 and 10 14 ions/cm 2. The experimental results have allowed us to develop a model for F-center creation taking into account the non-homogeneous distribution of the energy deposition in the crystal. A model of the interaction core surrounding the ion path in which the energy is dissipated by a delta-ray mechanism has been used to calculate the spatial energy distribution. Knowing the F-center creation efficiency by a delta-ray mechanism it has been possible to simulate the F-center profiles. We found a rather good agreement between these calculated results and the experimental ones in the energy and dose ranges which have been studied.
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