1. Electronic and Vibrational Excitons in Molecular Crystals
2. Ionized states of molecular crystals
3. While the ionic states clearly are involved in electron conduction and electron-hole combination processes in molecular systems, they also have been used to explain a wider variety of phenomena. For example, a configuration interaction scheme mixing ionic and neutral exciton states has been used extensively to represent the delocalization of electrons in molecular aggregates. Using calculated or parameterized off-diagonal matrix elements and energy denominators, this scheme appears to account for factor group splittings,5,6energy transfer rates,7excimers,8and pressure effects.9The ionic exciton states also seem to be important in energy multiplication processes (see Sections 4 and 5)