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
- 24 June 1991
- journal article
- Published by Wiley in FEBS Letters
- Vol. 284 (2) , 199-202
- https://doi.org/10.1016/0014-5793(91)80684-u
Abstract
Within the Qγ band of the primary electron donor (P), the spectra of absorbance changes due to the formation of a state P+QA− (QA is the primary quinone) at 1.7K in Rhodopseudomous 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 ∼50 cm−1 and 0–1 transition at 1000 nm with the width of ∼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 (∼0.37) is unvarying over the P band, the vibrations involved are totally symmetric. The ZPH (width of ∼3 cm−1) and phonon wings (frequency of ∼30 cm−1) are resolved within the P band near 1014 nm when the spectrum of ΔA due to the formation of bacteriopheophytinL− is measured at 1.7KKeywords
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