GEOMETRICAL EFFECTS ON ONE-DIMENSIONAL EXCITONS

The geometrical structures of linear chain systems are shown to be sen sitively reflected on the optical spectrum of Frenkel and Wannier exci tons. The effects of shape of the chain on the Frenkel exciton absorpt ion spectrum are represented by the geometrical factor describing the global chain structure and the line broadening due to the structure fl uctuations. The corner with the stronger curvature induces the stronge r attractive potential on the Wannier exciton so that the bound states are formed.