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Updated: Apr 18, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
General magnetic transition dipole moments for electron paramagnetic resonance
Joscha Nehrkorn1, Alexander Schnegg1, Karsten Holldack2
1Berlin Joint EPR Laboratory, Institut für Silizium-Photovoltaik, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany.
Abstract:
We present general expressions for the magnetic transition rates in electron paramagnetic resonance (EPR) experiments of anisotropic spin systems in the solid state. The expressions apply to general spin centers and arbitrary excitation geometry (Voigt, Faraday, and intermediate). They work for linear and circular polarized as well as unpolarized excitation, and for crystals and powders. The expressions are based on the concept of the (complex) magnetic transition dipole moment vector. Using the new theory, we determine the parities of ground and excited spin states of high-spin (S=5/2) Fe(III) in hemin from the polarization dependence of experimental EPR line intensities.
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