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Bestimmung der Hochfeldgrenze der dynamischen Kernpolarisation aus der Dispersion der Kernrelaxation

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Hausser,  Karl H.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Hausser, K. H. (1965). Bestimmung der Hochfeldgrenze der dynamischen Kernpolarisation aus der Dispersion der Kernrelaxation. Zeitschrift für Physik, 183(3), 265-273. doi:10.1007/BF01393261.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-46D7-6
Abstract
The dynamic nuclear polarisation arising from dipolar interactions between unpaired electrons and protons in liquids decreases with increasing magnetic fieldH0. Since the polarisation involves the same electron-proton flip-flop processes which are responsible for nuclear magnetic relaxation, we were able to determine the maximum possible enhancement factorVmax of the protons in paramagnetic solutions as a function of the applied magnetic field from the dispersion of nuclear magnetic relaxation. The measurements of the frequency dependence of nuclear magnetic relaxation in the field range of 33 to 38000 Gauss show thatVmax drops to one half of its low field value in fields of 2000 to 6000 Gauss depending on the solvent and on the temperature. An appreciable enhancement of the order of 50 or more seems to be possible in magnetic fields up to 30 or 40 kG.