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Optical absorption and thermoluminescence studies in 100 MeV swift heavy ion irradiated CaF2 crystals |
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| Authors: | C. Pandurangappa B.N. LakshminarasappaFouran Singh K.R. Nagabhushana |
| Affiliation: | a Department of Physics, RNS Institute of Technology, Channasandra, Bangalore 560 061, India b Department of Physics, Jnanabharathi Campus, Bangalore University, Bangalore 560 056, India c Inter University Accelerator Centre, P.O. Box No. 10502, New Delhi 110 067, India d Department of Physics, PES Institute of Technology, Banashankari, Bangalore 560 085, India |
| Abstract: | Pure and Ytterbium (Yb) doped Calcium fluoride (CaF2) single crystals were irradiated with 100 MeV Ni7+ ions for fluences in the range 5 × 1011-2.5 × 1013 ions cm−2. The irradiated crystals were characterized by Optical absorption (OA) and Thermoluminescence (TL) techniques. The OA spectra of ion irradiated pure CaF2 crystals showed a broad absorption with peak at ∼556 nm and a weak one at ∼220 nm, whereas the Yb doped crystals showed two strong absorption bands at ∼300 and 550 nm. From the study of OA spectra, the defect centers responsible for the absorption were identified. TL measurements of Ni7+ ion irradiated pure CaF2 samples indicated a strong TL glow with peak at ∼510 K. However, the Yb doped crystals showed two TL glows at ∼406 and 496 K. The OA and TL intensity were found to increase with increase of ion fluence upto 1 × 1013 ions cm−2 and thereafter it decreased with further increase of fluence. The results obtained are discussed in detail. |
| Keywords: | Optical absorption Ion fluence Thermoluminescence TL intensity Color centers |
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