Abstract
Room temperature EPR spectra of (NH4)2SO4 doped K2SO4 monocrystals irradiated with x-rays show the presence of NH3 + radicals. The EPR parameters areg ‖=2.0037 andg ⊥ = 2.0068;14NA XX=13.75;A YY=24.5;A ZZ=25.5 gauss;1HA XX=A YY=22 andA ZZ=25 gauss. From the14N and1H coupling constants it has been inferred that at room temperature the planar NH3 + radical undergoes rotation about theC 3 axis which corroborates with the equivalence of the protons, but the radical itself is in an asymmetric crystal field environment. The 77K spectra indicate a considerable reduction in the motion of the radical with the free motion almost completely stopped.
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