This paper presents a theoretical study of the excitonic spectra of a hexagonal 2D lattice of trimers (the structure of bacteriorhodopsin – BR). Formalism of dielectric permittivity and of gyration tensor allows to calculate the components of both tensors near the frequency of electronic excitation of retinal with λ≈ 570 nm. The two cases of oblique and normal incidence of left- and right-circularly polarized electromagnetic waves have been considered. In accordance with the experimental data at oblique incidence a negative circular dichroism (CD) couplet appears connected with the chiral excitonic coupling. At perpendicular incidence a single CD band of Lorentz type is caused by the internal gyrotropy of the molecules.
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Research Article| February 26 2019
Excitonic model and circular dichroism spectrum of bacteriorhodopsin
I. J. Lalov;
AIP Conf. Proc. 2075, 170002 (2019)
I. J. Lalov, N. A. Kojouharova; Excitonic model and circular dichroism spectrum of bacteriorhodopsin. AIP Conf. Proc. 26 February 2019; 2075 (1): 170002. https://doi.org/10.1063/1.5091367
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