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Abstract
Proton-electron double resonance, also named dynamic nuclear polarization (DNP) is characterized by an enhancement of the proton NMR signal when the electron resonance of a free radical coupled to water protons is saturated. In very low magnetic fields, new EPR transitions are allowed. The complete theory of DNP in nitroxide solutions is recalled, in order to interpret the experimental spectra. Proton-electron double resonance images (PEDRI) were obtained with 7 out of the 10 EPR transitions allowed in low fields. Field cycled PEDRI were obtained in magnetic fields as low as 0.6 G. The optimum field strength for PEDRI is discussed according to the theoretical and experimental results of DNP obtained with nitroxide solutions.
Published Version
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