title: Sub-picosecond dynamics of excited state of primary electron donor in reaction centers of Rhodopseudomonas viridis as revealed by hole burning at 1.7K broad and narrow holes.
abstract: Within the QF band of the primary electron donor (P), the spectra of absorbance changes due to the formation of a state of P+QA- (QA is the primary quinone) at 1.7K in Rhodopseudomonas viridis reaction centers excited at 1014 nm have been shown to involve two spectral features characterized by: (i) a progression of broad (170-190 cm-1) Gaussian vibronic bands (S-factor = 1.4) separated by 150 cm-1 and (ii) a 'narrow' structure near 1014 nm, characterized by 0-0 transition at 1014 nm with a width of approximately 50 cm-1 and 0-1 transition at 1000 nm with the width of approximately 100 cm-1, and S-factor = 0.9. The width of 50 cm-1 can be related to either zero-phonon hole (ZPH) width or the structure involving phonon wings and ZPH being unresolved. Since dichroic value (approximately 0.37) is unvarying over the P band, the vibrations involved are totally symmetric. The ZPH (width of approximately 3 cm-1) and phonon wings (frequency of approximately 30 cm-1) are resolved within the P band near 1014 nm when the spectrum of delta A due to the formation of bacteriopheophytinL- is measured at 1.7K.
authors.affiliation: Institute of Soil Science and Photosynthesis, USSR Academy of Sciences, Pushchino, Moscow region.
authors.forename: A O
authors.initials: AO
authors.lastname: Ganago
authors.lastname: Shkuropatov AYa
authors.forename: V A
authors.initials: VA
authors.lastname: Shuvalov
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004579:Electron Transport; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D012241:Rhodopseudomonas / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D045322:Photosynthetic Reaction Center Complex Proteins