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Femtosecond spontaneous-emission studies of reaction centers from photosynthetic bacteria

Du, Mei and Rosenthal, Sandra and Xie, Xiaoliang and DiMagno, Theodore J. and Schmidt, Mark and Hanson, Deborah K. and Schiffer, Marianne and Norris, James R. and Fleming, Graham R. (1992) Femtosecond spontaneous-emission studies of reaction centers from photosynthetic bacteria. Proceedings of the National Academy of Sciences of the United States of America, 89 (18). pp. 8517-8521. ISSN 0027-8424. PMCID PMC49951. doi:10.1073/pnas.89.18.8517.

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Spontaneous emission from reaction centers of photosynthetic bacteria has been recorded with a time resolution of 50 fs. Excitation was made directly into both the special-pair band (850 nm) and the Q_x band of bacteriochlorophylls (608 nm). Rhodobacter sphaeroides R26, Rhodobacter capsulatus wild type, and four mutants of Rb. capsulatus were studied. In all cases the fluorescence decay was not single exponential and was well fit as a sum of two exponential decay components. The short components are in excellent agreement with the single component detected by measurements of stimulated emission. The origin of the nonexponential decay is discussed in terms of heterogeneity, the kinetic scheme, and the possibility of slow vibrational relaxation.

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Additional Information:© 1992 National Academy of Sciences. Communicated by R. Stephen Berry, May 29, 1992. We thank M. Armas, C. Seaton, and A. Swygard of Coherent for the loan of the Mira laser. We thank Dr. C.-K. Chan for many helpful discussions, and G. Small for providing us with low-temperature absorption spectra. We thank N. Scherer for development of the dye laser used in this experiment. This work was supported by a grant from the National Science Foundation (G.R.F.), by the Department of Energy, Office of Basic Energy Sciences (J.R.N.) and Office of Health and Environmental Research (D.K.H. and M.S.) under Contract W-31-109-Eng-38. M.S. is also supported by U.S. Public Health Service Grant GM36598. This work is a publication of the Center for Photochemistry and Photobiology.
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Department of Energy (DOE)W-31-109-ENG-38
Issue or Number:18
PubMed Central ID:PMC49951
Record Number:CaltechAUTHORS:20141217-074135839
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Official Citation:Femtosecond spontaneous-emission studies of reaction centers from photosynthetic bacteria. M Du, S J Rosenthal, X Xie, T J DiMagno, M Schmidt, D K Hanson, M Schiffer, J R Norris, and G R Fleming PNAS 1992 89 (18) 8517-8521; doi:10.1073/pnas.89.18.8517
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52930
Deposited By: Ruth Sustaita
Deposited On:17 Dec 2014 17:09
Last Modified:10 Nov 2021 19:45

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