Exciton exciton annihilation dynamics in chromophore complexes. I. Multiexciton density matrix formulation

Autor:	V. May, B. Brüggemann
Rok vydání:	2003
Předmět:	Density matrix Annihilation Chemistry Exciton Molecular vibration General Physics and Astronomy Physical and Theoretical Chemistry Chromophore Atomic physics Internal conversion (chemistry) Biexciton Excitation
Zdroj:	The Journal of Chemical Physics. 118:746-759
ISSN:	1089-7690 0021-9606
Popis:	The multiexciton (MX) description of excitation energy transfer in chromophore complexes and biological light harvesting antenna systems is extended to the incorporation of exciton exciton annihilation (EEA) processes. To achieve a complete microscopic description the approach is based on intrachromophore internal conversion processes leading to nonradiative transitions from higher to lower lying exciton manifolds. Besides an inclusion of EEA the MX density matrix theory which has been utilized for a description of excitation energy transfer also accounts for a coupling to low-frequency vibrational modes and the radiation field. Concentrating on transitions from the two to the single-exciton manifold exact and approximate expressions for the EEA rate are derived. In part II of this paper the approach is applied to the LH2 antenna putting emphasis on the EEA induced change of transient absorption spectra.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8f9f7cfc6428816af46137f3d085a44b https://doi.org/10.1063/1.1523392 Zobrazit plný text záznamu