Magnetic dipole transitions as standards for Judd–Ofelt parametrization in lanthanide spectra

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Abstract
It is shown that the sum of the intensities for magnetic dipole transitions between crystal‐field components of two free‐ion levels in lanthanide spectra is almost independent of the symmetry of the environment. A mean theoretical sum value of 18×10−7D2, 94×10−7D2, and 9×10−7D2 for, respectively, the 5D1←7F0, 5D0←7F1, and 5D2←7F1 dipole strengths has been found. Experimental values of the dipole strength for Eu3+ in different lattices support within reasonable limits the theoretically derived sum rule. We therefore propose to use these magnetic dipole transitions in the Eu3+ spectrum as standards for further Judd–Ofelt parametrization.