Covalent mechanism of cooperative optical transitions in lanthanide exchange‐coupled pairs. Intensity calculations for double transitions in a M2L11 f1–f1 dimer

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Abstract
The covalent mechanism of cooperative optical transitions in exchange‐coupled pairs of lanthanide ions (which is closely related to the magnetic superexchange mechanism) is analyzed in detail for a simple M2L11 f1–f1 model dimer (two ML6 octahedra sharing one bridging ligand L). New effective electron transfer pathways in the M(A)–L–M(B) exchange system are considered and intensities of cooperative transitions from the (00) ground state to (ij) doubly‐excited states of the f1–f1 dimer are calculated including polarization effects.