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An EPR study has been performed on X-irradiated potassium ammonium sulphate, KNH 4 SO 4 (PAS), single crystals in the temperature range -120 o C to 150 o C. The samples were characterized by powder XRD. Three types of NH 3+ have been identified, along with SO 3- . While the first centre, (NH 3+ ) I is characterized with...
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