INFLUENCE OF DICHOTOMIC COLORED ENERGY FLUCTUATIONS ON EXCITONIC OPTICAL-LINE SHAPES OF TRIMERS AND TETRAMERS

For Frenkel excitons moving on molecular trimers and tetramers we inve stigate the influence of dynamic and static disorder on their optical line shapes. The dynamic disorder describes the influence of vibration al degrees of freedom and is taken into account by fluctuations of the local molecular excitation energy. The fluctuations are represented b y dichotomic Markovian processes with colored noise. We obtain a close d set of equations of motion for the correlation functions determining the optical line shape which is solved exactly. The line shapes are d iscussed for various sets of model parameters as well as various arran gements of molecules and their transition dipole moments.