Abstract
Spectral content of luminescence from nominally pure LiF and α-Al2O3 generated with 1–3 MeV/amu heavy ions have been studied. It is shown that self-trapped exciton (STE) emission band in LiF overlaps with a band suggested as an emission of exciton-like state in vicinity of impurity atom or impurity-radiation defect complex. The intensity ratio in these bands depends on ionizing density and becomes constant at averaged electronic stopping powers of about 7–8 keV/nm. Ion beam induced luminescence of α-Al2O3 at damage dose >10−4 dpa results from in-center optical transitions in F and F+-centers. The observed suppression of neutral F-center emission with increasing of specific ion energy losses is associated with the change of charge state of defects and local stresses in ion track core.
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