Showing papers by "Mordechai Bixon published in 1990"
01 Jan 1990
TL;DR: In this article, a rationalization for the prevalence of the superexchange mechanism in the primary charge separation is provided on the basis of a kinetic optimization criterion in conjunction with energy constraints on the medium reorganization energy.
Abstract: A number of physical phenomena and observables can be accounted for and are consistent with the superexchange mechanism for the primary electron transfer in the reaction centre of Rb.sphaeroides. These include electric field effects on the quantum yield and polarization of the prompt fluorescence, the unidirectionality of the charge separation and the magnetic properties and recombination dynamics of the primary radical pair. A rationalization for the prevalence of the superexchange mechanism in the primary charge separation is provided on the basis of a kinetic optimization criterion in conjunction with energy constraints on the medium reorganization energy.
5 citations
01 Jan 1990
TL;DR: In this paper, the primary charge separation in photosynthetic bacterial reaction centres (RC) is characterized by three unique features: (i) Ultrafast rate in the psec domain which precludes energy waste due to back transfer to the antenna, (ii) non-Arrhenius temperature dependence of the rate, which manifests optimal coupling to the medium nuclear motion, and (iii) unidirectionality across the A branch of the quasisymmetric RC.
Abstract: The primary charge separation in photosynthetic bacterial reaction centres (RC) is charactrized by three unique features: (i) Ultrafast rate in the psec domain which precludes energy waste due to back transfer to the antenna, (ii) non-Arrhenius temperature dependence of the rate, which manifests optimal coupling to the medium nuclear motion, and (iii) unidirectionality across the A branch of the quasisymmetric RC.
1 citations
01 Jan 1990
TL;DR: The mechanism of the primary charge separation in the bacterial reaction centre (RC) is of central importance for the elucidation of the energy conversion processes in photosynthesis as mentioned in this paper, and all the mechanisms proposed for the primary electron transfer (ET) from the singlet excited state of the bacteriochlorophyll dimer (P) along the A branch of the RC, attribute a special role to the accessory monomer bacterio chlorophyll (B), which is structurally located between P and the bacteriopheophytin (H).
Abstract: The mechanism of the primary charge separation in the bacterial reaction centre (RC) is of central importance for the elucidation of the energy conversion processes in photosynthesis. All the mechanisms proposed for the primary electron transfer (ET) from the singlet excited state of the bacteriochlorophyll dimer (P) along the A branch of the RC, attribute a special role to the accessory monomer bacteriochlorophyll (B), which is structurally located between P and the bacteriopheophytin (H).