Exchange interactions in a trigonal chromium(III) pair

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Abstract
The singly excited 2 E pair states in Cs3Cr2Br9 exhibit fine structure which has been analysed by absorption, MCD and transverse Zeeman spectroscopy and the theory given in part I (reference [1]). The corresponding transitions in Cs3Cr2Cl9 overlap with the 4 T 2 band and are weak and broad. Both singleion and exchange-induced transition electric dipoles are important in the pair transitions. There is evidence for the breakdown of the Landé interval rule for the exchange-split excited pair levels. The non-vanishing intensity observed in one ΔS = 2 pair transition requires the inclusion of anisotropic exchange terms in the pair hamiltonian. MCD and Zeeman spectroscopy give, in many cases, a precise identification of the spinor pair states.