Spectral hole burning study of intact cells of green bacterium Chlorobium limicola

Abstract

Spectral hole burning studies of intact cells of the green bacterium, Chlorobium limicola, have proven that the Qy-absorption system of antenna bacteriochlorophyll c (BChl c) should be interpreted in terms of the delocalized exciton level structure of an oligomer. For the first time the 0-0 band of the lowest exciton state of BChl c oligomers has been directly detected as the lowest energy inhomogeneously broadened band (FWHM approximately 100 cm-1; position of maximum, at approximately 774 nm) of the near-infrared BChl c band of 1.8K excitation spectrum (FWHM = 830 cm-1; position of maximum, at 751 nm).