Eur. Phys. J. B (2013) 86: 215
https://doi.org/10.1140/epjb/e2013-30586-5

Regular Article

Emission spectra of LH2 complex: full Hamiltonian model^*

¹ Department of Physics, Faculty of Science, University of Hradec Králové, Rokitanského 62, 50003 Hradec Králové, Czech Republic
² Institute of Mathematics and Quantitative Methods, Faculty of Economics and Administration, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic
³ Faculty of Education, University of Hradec Králové, Rokitanského 62, 50003 Hradec Králové, Czech Republic

^a e-mail: Pavel.Herman@uhk.cz

Received: 13 July 2012
Received in final form: 7 January 2013
Published online: 16 May 2013

Abstract

In the present contribution we study the absorption and steady-state fluorescence spectra for ring molecular system, which can model B850 ring of peripheral light-harvesting complex LH2 from purple bacterium Rhodopseudomonas acidophila (Rhodoblastus acidophilus). LH2 is a highly symmetric ring of nine pigment-protein subunits, each containing two transmembrane polypeptide helixes and three bacteriochlorophylls (BChl). The uncorrelated diagonal static disorder with Gaussian distribution (fluctuations of local excitation energies) simultaneously with the diagonal dynamic disorder (interaction with a bath) in Markovian approximation is used in our simulations. We compare calculated absorption and steady state fluorescence spectra obtained within the full Hamiltonian model of the B850 ring with our previous results calculated within the nearest neighbour approximation model and also with experimental data.