The electron-spin-resonance spectrum of Cr ions in NaCl is examined. After x irradiation, a spectrum is identified belonging to ions of Cr⁺(3d⁵) in sites of cubic symmetry. The g value, fine structure, and hyperfine splitting are determined, and compared with the corresponding values in the case of NaF. In addition, the unirradiated crystals yield a spectrum attributed to Cr²⁺(3d⁴) ions in noncubic sites of several types.
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B. Welber (1965) studied this question.
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