Channels of the exciton-exciton annihilation in one-dimensional aggregatesat low temperature

Exciton-exciton annihilation is implied to be in fact a unique channel of e xciton degradation in linear molecular aggregates and conjugated polymers a s the pump intensity rises. However, at low temperatures, excitons represen t rather immobile than movable quasi-particles due to the localization effe ct. We analyze possible channels of exciton-exciton annihilation, which see m to be natural ones under the conditions of localization and low temperatu re, and calculate the corresponding rates. (C) 2000 Elsevier Science B.V. A ll rights reserved.