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| − | The MS shall be described by singly excited electronic states which may constitute Frenkel-like excitons. Those are the correct excitations if wave function overlap and thus electron exchange between different molecules are of minor effect. The related standard Hamiltonian reads
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| − | <math>\label{h-fx}
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| − | H_{\rm FX} = \sum_{m} E_m \ket{\phi_m}\bra{\phi_m}
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| − | + \sum_{m \neq n} J_{m n} \ket{\phi_m}\bra{\phi_n} \; .</math>
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| − | It includes the molecular excitation energies (site energies) <math>E_{m}</math> where <math>m</math> labels the individual molecule and the EET (excitonic) coupling <math>J_{m n}</math>.
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