Abstract
The direct ESR absorption between the singlet ground and triplet excited states of the spin-gap systems is investigated. Such an absorption, which is forbidden by the conservation of the total spin quantum number in the ordinary Heisenberg-Hamiltonian, is caused by the Dzyaloshinskii–Moriya interaction. We show the selection rule in the presence of the interaction, using the exact diagonalization of the finite cluster of the quasi-one-dimensional bond-alternating spin system. The selection rule is also modified into a suitable form for the investigation of the recent experimental result for CuGeO 3.
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