期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 21, 页码 3636-3640出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz401944q
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资金
- NSF MRSEC [DMR 08-02054]
- Keck Foundation
- AFOSR [FA9550-09-1-0117]
- DARPA QuBE program [N66001-10-1-4060]
- DTRA [HDTRA1-10-1-0091]
- NSF GRFP
- Graduate Program in Biophysical Sciences at the University of Chicago (NIH) [T32 Eb009412]
- DOE-SCGF program
Two-dimensional electronic spectroscopy (2DES) elucidates electronic structure and dynamics on a femtosecond time scale and has proven to be an incisive tool for probing congested linear spectra of biological systems. However, samples that scatter light intensely frustrate 2DES analysis, necessitating the use of isolated protein chromophore complexes when studying photosynthetic energy transfer processes. We present a method for conducting 2DES experiments that takes only seconds to acquire thousands of 2DES spectra and permits analysis of highly scattering samples, specifically whole cells of the purple bacterium Rhodobacter sphaeroides. These in vivo 2DES experiments reveal similar time scales for energy transfer within the antennae complex (light harvesting complex 2, LH2) both in the native photosynthetic membrane environment and in isolated detergent micelles.
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