Origin of the CIDNP Effect
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A nuclear polarization of the reacting products in the probes of nuclear magnetic resonance (NMR) spectrometers was observed independently in 1967 by two groups of investigators: Bargon, Fischer, and Johnsen (Germany) , and Ward and Lawler (USA) [7,8]. The NMR spectra of these products show emission or enhanced absorption, disappearing to give lines of normal intensity at the end of the reaction. The nuclear spin states are polarized when they acquire populations different from the Boltzmann equilibrium during this chemical reaction.
KeywordsNuclear Magnetic Resonance Spectrum Radical Pair Dynamic Nuclear Polarization Hyperfine Coupling Constant Chemically Induce Dynamic Nuclear Polarization
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