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We describe an experimental technique for associating the satellite lines ina rare earth optical spectrum caused by a defect with the rare earth ions incrystal sites around that defect. This method involves measuring the hyperfinesplitting caused by a magnetic dipole-dipole interaction between host ions anda magnetic defect. The method was applied to Ce3+:EuCl3.6H2O to assign 13 ofthe outermost 22 satellite lines to sites. The assignments show that theoptical shift of a satellite line is loosely dependent on the distance to thedopant. The interaction between host and dopant ions is purely dipole-dipole atdistances greater than 7 Angstroms, with an additional contribution, likelysuperexchange, at distances less than 7 Angstroms.

A method for assigning satellite lines to crystallographic sites in rare earth crystals