Abstract
Molecular absorption spectra are obtained by measuring the attenuation versus frequency of a beam of electromagnetic radiation as it passes through a sample of matter. In such kinds of spectroscopy, the electric field component of the radiation interacts with the electric dipole moment of the molecule. In magnetic resonance spectroscopy, however, the interaction of magnetic dipole moments with the oscillating magnetic component of electromagnetic radiation is measured. Molecular magnetic moments may either arise from the nuclei (nuclear magnetic resonance, NMR) or the electrons (electron paramagnetic resonance, EPR) of a system.
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