Paramagnetic resonance of irradiated ferroelectric LiN2H5SO4

Abstract The electron spin resonance spectra of γ-ray damaged ferroelectric lithium hydrazinium sulphate (LiHzS) and deuterated LiHzS have been studied. A comparison of experimental and theoretical resonance patterns indicated that: (a) the principal impurity centers produced by γ-rays in LiHzS and deuterated LiHzS are 2 H 4 + and 2 D 4 + , respectively; (b) the unpaired electron spin densities on both nitrogens are nearly equal to each other, and the charge distribution has local cylindrical symmetry about both nitrogen nuclei; (c) the approximate values of the Isotropic and anisotropic nitrogen hyperfine coupling constants are A 1 = 14, A 2 = 12 and B 1 = 8, B 2 = 7 G, respectively.