The observation of excited-state dynamical evolution in light-harvesting complex LH2 from Rhodobacter sphaeroides 601

FEBS Lett. 2002 Jan 30;511(1-3):69-72. doi: 10.1016/s0014-5793(01)03281-1.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Energy Transfer
  • Kinetics
  • Lasers
  • Light*
  • Photosynthetic Reaction Center Complex Proteins / chemistry*
  • Photosynthetic Reaction Center Complex Proteins / radiation effects*
  • Rhodobacter sphaeroides / chemistry*
  • Spectroscopy, Near-Infrared
  • Thermodynamics

Substances

  • Photosynthetic Reaction Center Complex Proteins