Abstract
AbstractEarly transient EPR spectra at room temperature, with high spectral (K‐band, 24 GHz) and time (50 ns) resolution, are presented for whole cells of deuterated cyanobacteria (Synechococcus lividus). A full range, between high and low microwave power, is covered. The true low‐power spectrum of the charge‐separated state in Photosystem I prior to electron transfer to the iron‐sulfur center acceptors could be established. The anisotropic nature of the signal has been confirmed with the observation of transient nutations at high microwave power, which indicate possible motional effects or spin dynamics.
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