Electron Paramagnetic Resonance (EPR) Spectroscopy
Published Online: 15 DEC 2011
Copyright © 2011 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Inorganic and Bioinorganic Chemistry
How to Cite
Hales, B. J. 2011. Electron Paramagnetic Resonance (EPR) Spectroscopy. Encyclopedia of Inorganic and Bioinorganic Chemistry.
- Published Online: 15 DEC 2011
Electron-Paramagnetic Resonance (EPR) spectroscopy, also know as Electron-Spin Resonance (ESR) spectroscopy, monitors the energy levels of paramagnetic molecules. The major energy interaction (Zeeman Interaction) is between the magnetic moment of the electron and the field of a large uniform magnet. This interaction splits the normally degenerate spin levels of the electron and the electron-paramagnetic resonance (EPR) spectrometer measures the energy of this interaction. The EPR spectrometer is described along with a discussion of spectral optimization techniques. Additionally, energy interaction terms are described and include hyperfine coupling (the interaction of the magnetic moments of the unpaired electron and magnetic nuclei) and spin-orbit coupling, which influences the magnitude of the spectroscopic g-factor and the energy levels of S > 1/2 systems. The general features of half-integer and integer high-spin systems are further described, including examples.
- bioorganometallic chemistry;
- electron paramagnetic-resonance spectroscopy (EPR);
- electron-spin resonance spectroscopy (ESR);
- hyperfine interaction;
- Zeeman interaction