Structure and Marker Mode of The Primary Electron Donor State Absorption of Photosynthetic Bacteria: Hole Burned Spectra

Abstract

Structured photochemical hole burned spectra are presented for P870 and P960 of the reaction centers (RC) of Rhodobacter sphaeroides and Rhodopseudomonas viridis. A special pair marker mode (ωsp) Franck-Condon progression is identified for both P870 and P960. Zero-phonon holes are reported which yield P870* and P960* decay times in good agreement with the time domain values. This agreement suggests that vibrational thermalization occurs prior to the primary charge separation process. The theory of Hayes and Small [1], embellished for the marker mode progression, is shown to account for the primary donor state absorption and burn-wavelength dependent hole spectra. Site excitation energy selection is used to establish correlation between a higher energy RC state and P* for both bacteria.KeywordsReaction CenterPhotosynthetic BacteriumSpecial PairRhodobacter SphaeroidesCharge Transfer StateThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.