Abstract
Weak satellite lines were found in the optical excitation spectra of the Eu 3+ 7 F 0– 5 D 0 in Eu 3+ : Y 2O 3 crystals (undoped, Sc 3+ doped and Zr 4+ doped). Optical-RF double resonance of the ground state are reported for the main and satellite lines of undoped and Sc 3+ doped Eu 3+ : Y 2O 3. In the inhomogeneous broadening for both the main and satellite, the RF resonance corresponding to transition of I z=± 3 2 –± 1 2 increased with increasing the optical frequency with a rate of +10 kHz/GHz but RF resonance of I z=± 5 2 –± 3 2 did not dependent on the optical frequency. We could map site distribution on RF-optical axes and identify the site with three parameters (optical and two RF frequencies). Additional sites in Sc 3+-doped crystal were found in the site mapping.
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