November 20, 2023 Käβ, H., P. Fromme, and W. Lubitz, (1996) Quadrupole parameters of nitrogen nuclei in the cation radical P700.+ determined by ESEEM of single crystals of phtosystem I. Chemical Physics Letters, 257(1–2): 197-206. Home » Käβ, H., P. Fromme, and W. Lubitz, (1996) Quadrupole parameters of nitrogen nuclei in the cation radical P700.+ determined by ESEEM of single crystals of phtosystem I. Chemical Physics Letters, 257(1–2): 197-206.