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For magnetic dipole transitions, it seems well-known examples are Eu3+ doped phosphors, for example, Eu3+:Y2O3 and Eu3+ chelates. The $^5D_0 \rightarrow ^7F_1$ transition is magnetic dipole allowed, which is competitive to the $^5D_0 \rightarrow ^7F_2$ electric dipole transition, as shown in the following figure. This is a kind of examples that almost ...
Observation of a pure electric quadrupole mechanism for a solid-state electronic transition A pure electric quadrupole electronic transition was observed for single crystals of $\ce{Cs2UO3Cl4}$. In the conclusion, the authors wrote: Finally we wish to comment on the possible occurrence of other examples of this mechanism. The relative magnitude of the ...