Nuclear coherences in photosynthetic reaction centers following light excitation |
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Authors: | S Weber T Berthold E Ohmes M C Thurnauer J R Norris G Kothe |
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Institution: | 1. Department of Chemistry, The University of Chicago, Chicago, USA 2. Department of Physical Chemistry, University of Freiburg, Albertstr. 21, D-79104, Freiburg, Germany 3. Chemistry Division, Argonne National Laboratory, Argonne, USA
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Abstract: | Transient electron paramagnetic resonance is used to study the secondary radical pair in plant photosystem I. Nuclear coherences are observed in the transverse magnetization at lower temperatures following light excitation. Comparative studies of deuterated and deuterated15N-substituted cyanobacteriaS. lividus indicate assignment of these coherences to nitrogen nuclei in the primary donor and deuterons in the secondary acceptor. The modulation amplitude of a deuteron matrix line, as a function of the microwave power, reveals a distinct resonance behavior. The maximum amplitude is obtained when the Rabi frequency equals the nuclear Zeeman frequency. |
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