title: Low-lying excited states of light-harvesting system II in purple bacteria.
abstract: The low-lying excited states of a B850 ring of Rhodospirillum (Rs.) molischianum are determined accurately by a semiempirical INDO/S method. Results obtained are found to fit extremely well with a Frenkel exciton model with long-range dipolar interactions, and the spatial size of the electron-hole pair is confirmed to fall predominantly within one bacteriochlorophyll with a small leakage to its nearest neighbors. More importantly, the nearest neighbor exciton coupling constants are found to be close to those evaluated directly from dimers, and thus, an existing discrepancy between calculated results of dimers and B850 rings has been resolved.
authors.affiliation: Department of Chemistry, University of Hong Kong, Hong Kong, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Man-Fai
authors.initials: MF
authors.lastname: Ng
authors.forename: GuanHua
authors.initials: G
authors.lastname: Chen
mesh_terms: D003198:Computer Simulation; D004735:Energy Transfer / Q000502:physiology*; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry* / Q000502:physiology / Q000528:radiation effects; D008954:Models, Biological; D008958:Models, Molecular; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000502:physiology / Q000528:radiation effects; D020560:Proteobacteria / Q000502:physiology*; D012246:Rhodospirillum / Q000502:physiology*
chemical_list: D045342:Light-Harvesting Protein Complexes; D045332:Photosystem II Protein Complex