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The question of the intermediate state P + Chl ‐ in bacterial photosynthesis
Author(s) -
Kirmaier Christine,
Holten Dewey,
Parson William W.
Publication year - 1985
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(85)80744-4
Subject(s) - bacteriochlorophyll , picosecond , excited state , photochemistry , electron transfer , photosynthesis , chemistry , ultrafast laser spectroscopy , absorption (acoustics) , singlet state , fluorescence , molecule , atomic physics , physics , spectroscopy , biochemistry , optics , laser , organic chemistry , quantum mechanics
In bacterial photosynthesis it has been proposed that an electron is transferred from the excited singlet state (P∗) of theprimary electron donor first to a bacteriochlorophyll (BChl) molecule, generating a P + Chl charge‐transfer state, and that BChl ‐ subsequently (4–7 ps) transfers an electron to a bacteriopheophytin molecule. Here we review the evidence for and against the intermediacy of P + BChl ‐ and present picosecond transient absorption and kinetic data that bear on this point. We conclude that there is no convincing evidence that P + BChl is a kinetically or spectrally resolved intermediary state in the charge separation process.