G. Ramesh Kumar

Growth and PhysioChemical Properties of Second-Order Nonlinear Optical L-Threonine Single Crystals

The present aim of the paper is to grow and to study the various properties of L-threonine amino acid single crystal in various aspects. Crystal growth of L-threonine single crystals has been carried out with the help of crystallization kinetics. pH and deuteration effects on the properties of the grown crystals have been studied and the results presented in a lucid manner. The various second-order NLO parameters were evaluated using anharmonic oscillator model. Particle and ion irradiation effects on structural, optical, and surface properties of the crystals have also been studied in detail.

Spectral, electrical and thermal properties of electron-irradiated L-threonine single crystals

Electrons of energy 6 MeV have been irradiated on L-threonine single crystals. Crystals irradiated at various electron fluences were subjected to various techniques such as Fourier transform infrared spectroscopy, dielectric and Kurtz–Perry powder second harmonic generation analyses. Differential scanning calorimetry measurement has also been carried out to test the thermal stability of the irradiated samples. The results have been discussed in detail.

Swift ion irradiation effects on L-threonine amino acid single crystals

Single crystals of L-threonine were subjected to 50 MeV Li3+ ion irradiation at various ion fluences. Radiation induced changes in the structural, electrical, thermal and optical properties of the crystals have been studied in detail. The ion fluence dependence on these properties has also been discussed. Surface modifications in the crystals have been explored through atomic force microscopy. It has also been observed that the powder second-harmonic generation efficiency of irradiated L-threonine varies with the ion fluence studied.