Emission spectra in non-symmetric dimer systems: fine structure of emission bands and dependence on asymmetry parameters

The fine structure of emission bands of asymmetric dimers with different excitation energies and optical transition matrix elements of the monomers constituting the dimer is investigated. Emission bands are calculated for various initial states which belong either to a single adiabatic branch or are due to a mixing of the adiabatic branches in the spectrum. Mixing of adiabatic branches is shown to result in spectral randomness and complex bands which spectral ranges can change drastically when the asymmetry is varied.