Abstract
Summary Photochemically induced dynamic nuclear polarization (photo-CIDNP) is non-Boltzmann nuclear magnetization which can be observed by NMR spectroscopy as enhanced absorptive (positive) or emissive (negative) signals. In solids, photo-CIDNP has been observed since its discovery in 1994 in various photosynthetic reaction centers (RCs) by magic angle spinning (MAS) solid-state NMR. The photo-CIDNP effect in solids can be explained by a combination of several mechanisms, e.g., three-spin mixing (TSM) and differential decay (DD), which transfer the electron spin polarization obtained in the initial singlet radical pair to nuclei via hyperfi ne interaction. Therefore, photo-CIDNP MAS NMR allows to study the electronic structure of the electronic
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