"For magnetic fields that can be routinely produced in the laboratory, the transitions between energy levels for nuclear magnetic dipoles occur in the radio-frequency range, and the transitions between energy levels for unpaired electron spins occur in the microwave range. Nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) yield such valuable structural information that they have become indispensable in chemistry."
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Robert J. Silbey, Robert A. Alberty, Moungi G. Bawendi Physical Chemistry, 4th ed. (2005) Ch. 15 : Magnetic Resonance Spectroscopy
https://en.wikiquote.org/wiki/Nuclear_magnetic_resonance
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Nuclear magnetic resonance
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