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X and Q-band endor study of the Fe+ (I) center in chlorinated SrCl2 single crystals

Abstract Previous Electron Paramagnetic Resonance (EPR) studies have shown that Fe2+ doped SrCl2 crystals grown in a chlorine atmosphere exhibit new trapped electron Fe+ centers after irradiation with X or γ-rays at 77 K. Two types of such centers, called Fe+ (I) and Fe+ (II), both exhibiting axial ⟨001⟩ symmetry, have been identified. We present here the results of an Electron Nuclear Double Resonance (ENDOR) study in X and Q-band on the Fe+ (I) center, which has been found to be thermally stable up to 700K. The superhyperfine and quadrupole interactions of the paramagnetic Fe+ ion with the nearest Cl− ions have been determined from the ENDOR angular dependence data. The results strongly suggest that the Fe+ (I) center consists of a Fe+ ion in the center of a cube of eight Cl− ions, compressed along an ⟨001⟩ direction.