Electron Paramagnetic Resonance
Elementary Theory and Practical Applications
Chapter One
BASIC PRINCIPLES OF
PARAMAGNETIC RESONANCE
1.1 INTRODUCTION
The science of electron paramagnetic resonance (EPR) spectroscopy is very similar
in concept to the more familiar nuclear magnetic resonance (NMR) technique. Both
deal with the interaction between electromagnetic radiation and magnetic moments;
in the case of EPR, the magnetic moments arise from electrons rather than nuclei.
Whether or not the reader has an immediate interest in the multitude of systems
to which EPR is applicable, the insights that it provides cannot be ignored. Furthermore,
there is hardly another technique from which one can gain a clearer insight
into many of the fundamental concepts of quantum mechanics.
Much of our knowledge of the structure of molecules has been obtained from the
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