Abstract
Electron spin echoes on tetragonally distorted non-Kramers Cr2+ ions in chromium doped BaF2 and SrCl2 single crystals have been observed. The superhyperfine interaction (shf) with the nearest halide ions has been studied using the electron spin echo envelope modulation (ESEEM) signal. For Cr2+ in BaF2 the nearest coordination shell consists of four equivalent fluorine ions in a plane perpendicular to the defect tetragonal axis, the Cr2+ ion being off-centre displaced towards the fluorine plane. The Cr2+ shf tensor for BaF2 has been determined. For SrCl2:Cr ESEEM signals associated to the shf interaction with nearest chloride ions were observed but the measurements did not allow us to give a definitive defect model in this case.
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