Abstract
A single-crystal ENDOR study of S2–, Se2– and SSe– defects in NaCl is presented. ENDOR signals corresponding with interactions with the nearest neighbouring Na+ ions are found. For each interaction, the superhyperfine (SHF) and nuclear quadrupole coupling tensors are determined. These ENDOR results can be explained only by assuming a monovacancy model, i.e. the S2–, Se2– or SSe– ion replaces a single Cl– ion on a lattice site. Analysis of the ENDOR data also reveals that the nearest neighbouring Na+ ions are displaced with respect to their lattice position. The size of the defect ions suggests that they will be incorporated into the NaCl lattice under great strain.
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