The Exciton Spectrum of Polyglycine and Polyalanine

The importance of strong intermonomer interactions in building up the exciton is also reflected in the substantial delocalization of the excitonic wave function. Detailed results show that charge-transfer excitations for a distance of 4-5 residues contribute significantly to the calculated binding energy of the exciton, Eq. The Frenkel exciton (n = 0) 

TABLE 8.3. Singlet and Triplet Exciton Bands, E(K and the Corresponding Oscillator Strengths, /, Obtained for the a-Helical Polypeptide Backbone (energies in eV after Suha  

For comparison, the approximately calculated value of/for the corresponding monomer transition is also shown. 

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