Abstract
The modifications of calcium sulphate (CaSO 4·2H 2O) single crystals are investigated by means of Raman and Fourier transform infrared spectroscopy (FT-IR) using 100 MeV Ag 8+ ions in the fluence range 1 × 10 11 to 5 × 10 13 ions/cm 2. It is observed that the intensities of the Raman modes decrease with increase in ion fluence. We determined damage cross-section ( σ) for all the Raman active modes and found to be different for different Raman modes. Further, FT-IR studies have been carried out to confirm surface amorphisation for a fluence of 1 × 10 13 ions/cm 2. It is observed that the absorption peaks at 1132–1156 cm −1 corresponds to ν 3(SO 4 2−) mode. The decrease in Raman peaks intensity with ion fluence is attributed to degradation of ν 3(SO 4 2−) modes present on the surface of the sample.
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