紫色光合细菌LH1和LH2的激子能级结构(I)——理论与模型

Excitonic Level Structure of LH1 and LH2 of Purple Photosynthetic Bacteria (I)——Theory and Model

为了理解紫色光合细菌LH1和LH2的可能的光谱性质,解析地研究了二聚物环状链的激子能级结构.在叶绿素分子间偶极子-偶极子相互作用的近似下,利用偶极子间的相互作用能量和指向参数,解析地给出了激子能级、带宽和两个Davydov子能带间的带宽.提出的模型包括了系统中色素分子间所有的相互作用.

The excitonic level structure of a ringlike chain of dimers is discussed analytically to understand the possible spectral properties of LH1 and LH2 of purple photosynthetic bacteria. Under the approximation of dipole-dipole interaction between Bchls, the excitonic levels, band width and energy gap between two Davydov subband are expressed analytically in terms of all interaction energies and oriental parameters of dipole. Our model include all interactions between pigment molecules in the system.