Calculation of the Exciton Band Structure of the 3800- and 2500-Å Singlet Transitions of Crystalline Anthracene

Abstract

The exciton band structure of the 3800‐ and 2500‐Å transitions of anthracene has been calculated in the dipole approximation. It is found that the branches of both transitions are flat for wave vectors k normal to the (001) plane. In other directions considered the exciton energy exhibits dispersion. The calculations also reveal that for all the directions considered the lowest energy of the 2500‐Å exciton band is not a k = 0 state.