Primary Charge Separation in the Photosynthesis of Bacterial Reaction Centers

Holzapfel, W. B.; Finkele, Ulrich; Lauterwasser, Christoph; Dressler, K.; Hamm, Peter

doi:10.1007/978-3-642-84269-6_158

Cited by 1 publication

(2 citation statements)

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“…Since these predicted anisotropies are not observed one can conclude that the observed signals are probably not due to transitions to |P + B L -〉. The kinetics that are observed do not show any significant contribution from the 0.9 ps kinetic component that is associated 13,[63][64][65] with the formation of P + Hfrom P + B -, thereby ruling out that appreciable transient absorption is seen from |P + B L -〉 to higher lying states.…”

Section: Interpretations Involving P + Bmentioning

confidence: 83%

“…-. There is considerable experimental evidence 13,[63][64][65] that the state P + Bis a shortlived (0.9 ps) but real intermediate in the electron transfer from P* to P + H -. Independent of whether P + Bis a real intermediate or a state that is involved in a superexchange mechanism, some of the signals we observe might be related to it.…”

Section: Interpretations Involving P + Bmentioning

confidence: 99%

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Femtosecond Infrared Spectroscopy of Low-Lying Excited States in Reaction Centers of Rhodobacter sphaeroides

et al. 1996

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The mid- to near-IR difference spectra of optically pumped and unpumped reaction centers were recorded over a time range circa 0.1−20 ps allowing us to isolate kinetically the transient electronic spectra of the excited special pair P* and its charge-separated form P+H-. The spectrum of P* between 1 and 5.2 μm exhibits two main bands, one at 5300 cm-1 and another at 2710 cm-1, while P+H- exhibits two bands, one at 2600 cm-1 and another at 8000 cm-1. These new states do not appear as transitions of unexcited reaction centers at E(P*) + 5300 cm-1 or E(P*) + 2710 cm-1 (although the former is close to the QX transition region of the special pair), suggesting that they derive almost exclusively from charge transfer (PL +PM - or PL -PM +) states. This conclusion is strengthened by the anisotropies obtained by pumping P* and probing these transitions with polarized light. The transition of P+H- at 2600 cm-1 corresponds to the known hole transfer transition, and this assignment is confirmed by kinetic and anisotropy measurements: the transition dipole is along the direction of charge transfer between PL and PM. The anisotropy for the transition at 8000 cm-1 is consistent with a transition dipole along the y-axis of PM, in agreement with theoretical predictions for a trip−doublet transition.

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Section: Interpretations Involving P + Bmentioning

confidence: 83%

Section: Interpretations Involving P + Bmentioning

confidence: 99%