Swift heavy ion (SHI) beams have become an indispensable role in material processing and in the modification of the surface layer of solids. Recent advances in the region of very high-energy physics and progress in the experimental methods have produced some qualitative new results regarding modifications induced by high-energy ions. High-energy heavy ion irradiation is an age old field in materials science and technology. When a swift heavy ion irradiation passes through matter; it loses its energy mainly in two ways. The interaction of heavily charged ions with electrons of the target material through Coulomb forces, produce a track of ionization and highly kinetic electrons along the path of the primary ion due to inelastic collision. This is known as electronic energy loss or electronic stopping (S_e). Nuclear energy loss or nuclear stopping (S_n) dominates at low energies, which is caused by the elastic scattering from the screened nuclear potential of the target. Both S_n and S_e give rise to various modifications of the solids. In the regime of ion energies where electronic energy loss is dominant, several interesting features of modifications of solids have been observed in recent years.

Pure single crystals of Glycine Lithium sulphate (GLS) were irradiated at room temperature with 50 MeV Silver ions at fluences varying from 10¹⁰ to 10¹² ions/cm² from the 15 UD Pelletron facilities at Inter University Accelerator Centre (IUAC), New Delhi. The pristine as well as irradiated GLS crystals were characterized by photoluminescence at room temperature and UV-Vis absorption to study the radiation induced defects. Photoluminescence and UV-Vis absorption show the formation of defects due to heavy ion impact. The ion-induced changes in mechanical behaviour have also been studied using Vickers micro hardness technique. The effect of swift heavy ion beam on dielectric dispersion was studied in detail. The second harmonic generation efficiencies of the pure and irradiated crystals were presented in comparison with KDP, which shows a trifling increase in SHG efficiency upon irradiation. Surface morphology was analysed by scanning electron microscopy for pristine and irradiated GLS crystals. Fig.1 explains the hydrogen ion concentration Vs irradiation fluence. The results will be presented in detail.

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