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Proton beams of 7 MeV energy, produced by a linear accelerator, were used to irradiate LiF crystals and thin films thermally evaporated on glass substrates in the dose range from 103 to 4 × 106 Gy, inducing the formation of stable photoluminescent colour centres (mainly F2 and F3+), emitting in the visible spectral range. Using a conventional fluorescence microscope, the transversal proton beam intensity...
Proton beams of 3 and 7MeV energies, produced by a linear accelerator, were used to irradiate lithium fluoride crystals and thermally evaporated LiF thin films in the fluence range of 1011–1015protons/cm2. The irradiation induces the formation of stable colour centres, mainly the primary F centre and the aggregate F2 and F3+ defects. By optical pumping in the blue spectral region, the F2 and F3+ centres...
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