Raman and infrared study of 100MeV swift Ag8+ heavy ion irradiation effects in CaSO4·2H2O single crystals

Abstract

a b s t r a c tThe modifications of calcium sulphate (CaSO 4 ·2H 2 O) 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 ( ) 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 3 (SO 4 2− ) mode. The decrease in Raman peaks intensity with ion fluence is attributed to degradation of 3 (SO 4 2− ) modes present on the surface of the sample.

Micro‐Raman investigation of nanosized zinc ferrite: effect of crystallite size and fluence of irradiation

“…The irradiation of the system generally leads to the following two effects: (1) restructuring of chemical species because of the energy deposited through electronic energy loss and (2) formation of ion‐induced defects leading to nonradiative recombination centres. In SHI irradiation events, these two processes occur simultaneously and compete with each other 31. The increase/decrease in the Raman peaks of the various modes may be attributed to the competition between these two effects 31, 32…”

“…In SHI irradiation events, these two processes occur simultaneously and compete with each other 31. The increase/decrease in the Raman peaks of the various modes may be attributed to the competition between these two effects 31, 32…”