title: Femtosecond spontaneous-emission studies of reaction centers from photosynthetic bacteria.
abstract: 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 Qx 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.
authors.affiliation: Department of Chemistry, University of Chicago, IL 60637.
authors.forename: M
authors.initials: M
authors.lastname: Du
authors.forename: S J
authors.initials: SJ
authors.lastname: Rosenthal
authors.forename: X
authors.initials: X
authors.lastname: Xie
authors.forename: T J
authors.initials: TJ
authors.lastname: DiMagno
authors.forename: M
authors.initials: M
authors.lastname: Schmidt
authors.forename: D K
authors.initials: DK
authors.lastname: Hanson
authors.forename: M
authors.initials: M
authors.lastname: Schiffer
authors.forename: J R
authors.initials: JR
authors.lastname: Norris
authors.forename: G R
authors.initials: GR
authors.lastname: Fleming
mesh_terms: D004735:Energy Transfer; D007700:Kinetics; D007834:Lasers; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism*; D013050:Spectrometry, Fluorescence
chemical_list: D045322:Photosynthetic Reaction Center Complex Proteins