![]() ![]() Principles of Electron Spin Resonance Ellis Horwood: Chichester, 1993. Large variations due to spin-orbit coupling and zero-field splitting.Typically close to free- electron value.Measured from the center of the signal.In the presence of a magnetic field, the two electron spin energy levels are: E = gmBB0MS g = proportionality factor mB = Bohr magneton MS = electron spin B0 = Magnetic field quantum number (+½ or -½).For a molecule with one unpaired electron.Based upon the spin of an electron and its associated magnetic moment.Spectra When phase-sensitive detection is used, the signal is the first derivative of the absorption intensity Cradock, Stephen Structural Methods in Inorganic Chemistry CRC Press: Boca Raton, 1987. What causes the energy levels? Resulting energy levels of an electron in a magnetic field Ebsworth, E. Required frequency of radiation dependent upon strength of magnetic field.Transition induced by the appropriate frequency radiation.ESR measures the transition between the electron spin energy levels.Useful for unstable paramagnetic compounds generated in situ.Applicable for species with one or more unpaired electrons.Examining the active sites of metalloproteins.Electron Paramagnetic Resonance Spectroscopy. ![]()
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