gamma-irradiated [(CH3)(4)N](2)SiF6 single crystal investigation by electron paramagnetic resonance technique

Abstract

In this study, gamma-irradiation damage centers in [(CH3)(4)N](2)SiF6 single crystal has been investigated by electron paramagnetic resonance spectroscopy (EPR) at room temperature. It has been found that gamma-irradiation produces the (CH3)<(N)overdot(+) radicals in this compound. The g factor and the hyperfine constant for H atoms, measured as 28.7 G, were found to be isotropic. The hyperfine coupling constant of the N nucleus, observed (CH3)(3)< (N)overdot >(+) hole radical in [(CH3)(4)N](2)SiF6 was found to be anisotropic with A(//) = 15 and A(perpendicular to) = 23 G, respectively. This means that each methyl groups rotate around the C-3 nu-axis and they also rotate around the C-3 nu-axis of (CH3)(3)<(N)over dot >(+) radical. These results were compared with the earlier studies in (CH3)(3)(N) over circle (+)radical and discussed. (c) 2006 Elsevier B.V. All rights reserved.