Fluctuations of Bacteriochlorophyll’s Positions in B850 Ring from Photosynthetic Complex LH2

Interactions with environment have large impact on the properties of light–harvesting (LH) pigment– protein complexes. Some of these interactions could be modeled by different types of static disorder. Fluctuations of bacteriochlorophyll’s positions in B850 ring from LH2 complex of purple bacteria are investigated in present paper. The nearest neighbour approximation model of the ring is considered. Four modifications of such uncorrelated Gaussian static disorder type (fluctuations of radial positions of molecules on the ring, fluctuations of angular positions of molecules on the ring, fluctuations of molecular positions in perpendicular direction to the ring plane and fluctuations of molecular positions in arbitrary direction) are taking into account. The most important statistical properties of the nearest neighbour transfer integral distributions for different strengths of static disorder are calculated, discussed and compared. Keywords—LH2 complex, B850 ring, static disorder, Hamiltonian, transfer integral distributions