Optical absorption spectra and monomer interaction in polymers. Investigation of exciton coupling in DNA hairpins

Details Optical absorption spectra and monomer interaction in polymers. Investigation of exciton coupling in DNA hairpins Optical absorption spectra and monomer interaction in polymers. Investigation of exciton coupling in DNA hairpins

2008-06-30

arxiv.org/abs/0806.4943v1

Physics

Chemical Physics

Submitted to Journal of Chemical Physics

Scientific paper

10.1063/1.2977727

We investigate the effect of exciton coupling on the optical absorption spectrum of polymer molecules under conditions of strong inhomogeneous broadening. We demonstrate that the dependence of the maximum in the rescaled absorption spectrum on the number of monomers is determined by the average monomer excitation energies and their resonant coupling and insensitive to the inhomogeneous broadening. Thus the absorption spectrum can be used to determine optical interactions between monomers. The results are applied to the absorption spectra of poly-A poly-T DNA hairpins and used to interpret the dependence of the absorption spectrum on the number of monomers. We also discuss exciton localization in these hairpins.

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