DELAY OF EXCITONIC SELF-TRAPPING (BOTTLENECK STATES)

The conventional barrier model of exciton self-trapping can be shown to display divergencies, whence a new explanation of the retarded luminescence phenomena (RLP) is necessary. In a previous work a novel ("exotic") sequence of exciton-phonon states has been found in the excitonic dimer case which provides the desired new theoretical concept for the RLP. Presently, this work is extended to the trimeric, tetrameric and to the E-e Jahn-Teller situations. It is shown that in each of these extensions the exotic sequences again make their appearance. These states are of non-self-trapping nature, and by way of their small extension in the Q-space they may acquire a "bottleneck" role in the process of energy dissipation.