Abstract
The cation radical of the primary donor P 700 of photosystem I (PS I) is investigated by ESEEM on single crystals of PS I from the cyanobacterium Synechococcus elongatus. The nuclear quadrupole parameters K and η of five different 14N nuclei are determined and 14N hyperfine coupling (hfc's) of P 700 .+ are evaluated. For comparison the cation of methyl-chlorophyllide a is studied in frozen solution. The 14N hfc data agree with published results for the 15N-labeled cation radicals of P 700 and chlorophyll a and are discussed in terms of a chlorophyll a dimer model for the cation radical P 700 .+.
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