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The observation of excited‐state dynamical evolution in light‐harvesting complex LH2 from Rhodobacter sphaeroides 601
Author(s) -
Guo Lijun,
Liu Yuan,
Yang Yi,
Mi Jun,
Xu Can,
Xu Chunhe,
Qian Shixiong
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(01)03281-1
Subject(s) - rhodobacter sphaeroides , excited state , relaxation (psychology) , atomic physics , chemistry , excitation , thermalisation , ultrafast laser spectroscopy , absorption (acoustics) , rhodobacter , molecular physics , physics , optics , photosynthesis , laser , psychology , social psychology , biochemistry , quantum mechanics , mutant , gene
With selective excitation around BChl–B800 and BChl–B850 absorption bands, we observed the evolution of excited‐state dynamics in LH2 from Rhodobacter sphaeroides 601. The dynamical traces demonstrate a dominant excited‐state absorption (ESA) followed concomitantly by an ultrafast transmission increase and decay with pulse‐width limited time scale at 818 nm and 828 nm excitation. The ESA occurring prior to excitonic thermalization or ground‐state bleach was observed at 840 nm as well. These experimental results indicate the competition between the transition from excitonic states to higher‐lying excited states and interexciton relaxation, which are of physical significance for understanding excitation transfer and related mechanisms in LH2.