Mechanism Behind the Electric Charges Generated by Photosynthesis (IMAGE)
Caption
a) The spectrum for the photosystem II complex obtained using time-resolved electron paramagnetic resonance (TREPR). A and E show the microwave signals for absorption and emission (electron spin polarization).
b) The 3-D imaging of (a) the electron spin polarization mapped to all possible magnetic field directions at a resonance magnetic field strength of 338.3 mT. The red and blue display respectively the strength of the absorption and emission of the microwave. For the samples where the film is aligned with the thylakoid membrane axis, the signal changes obtained when the direction of the external magnetic field (B0) with respect to the normal direction of the film plane (C2) are parallel (B0//C2) and perpendicular (B0?C2) support this 3-dimensional imaging. d shows the directional vector that links electric charges.
c) The orbit placement of the initial electric charge separation state (PheoD1-?PD1+?) in the reaction center obtained from image analysis of (b) and electronic interaction between adjacent pigments (V). The vinyl group (-CH=CH2) of PheoD1 approaches the nearby chlorophyll pigments, but because the vinyl group functions as an insulator then the energy loss caused by electron reversion is suppressed.
Credit
Kobe University
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