Exciton Hamiltonian for the Bacteriochlorophyll System in the LH2 Antenna Complex of Purple Bacteria

Sergei Tretiak, Chris Middleton, Vladimir Chernyak, Shaul Mukamel

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)

Abstract

An effective Frenkel-exciton Hamiltonian for the LH2 photosynthetic complex from Rhodospirillum molischianum is calculated using the collective electronic oscillator (CEO) approach combined with the crystal structure. The absorption spectra of the various bacteriochlorophyll aggregates forming the complex are computed using the CEO. Each electronic transition is further analyzed in terms of its characteristic electron-hole motions in real space. Using a two-dimensional representation of the underlying transition density matrices, we identify localized and delocalized electronic transitions, test the applicability of the exciton model, and compute interchromophore electronic couplings. Förster energy-transfer hopping time scales within B800 and from the B800 to the B850 system, obtained using the computed coupling constants, are in excellent agreement with experiment.

Original languageEnglish
Pages (from-to)4519-4528
Number of pages10
JournalJournal of Physical Chemistry B
Volume104
Issue number18
DOIs
Publication statusPublished - 11 May 2000
Externally publishedYes

Fingerprint

Dive into the research topics of 'Exciton Hamiltonian for the Bacteriochlorophyll System in the LH2 Antenna Complex of Purple Bacteria'. Together they form a unique fingerprint.

Cite this