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Raman and infrared study of 100 MeV swift Ag heavy ion irradiation effects in CaSO4·2H2O single crystals
Authors:H. Nagabhushana   B.M. Nagabhushana   H.B. Premkumar   B.N. Lakshminarasappa   Fouran Singh  R.P.S. Chakradhar
Abstract:The modifications of calcium sulphate (CaSO4·2H2O) single crystals are investigated by means of Raman and Fourier transform infrared spectroscopy (FT-IR) using 100 MeV Ag8+ ions in the fluence range 1 × 1011 to 5 × 1013 ions/cm2. 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 × 1013 ions/cm2. It is observed that the absorption peaks at 1132–1156 cm−1 corresponds to ν3(SO42−) mode. The decrease in Raman peaks intensity with ion fluence is attributed to degradation of ν3(SO42−) modes present on the surface of the sample.
Keywords:Quasi crystals   Electron phonon interactions   Atom   Molecule   Ion impact
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