Electronic Resource
Springer
The European physical journal
183 (1965), S. 265-273
ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The dynamic nuclear polarisation arising from dipolar interactions between unpaired electrons and protons in liquids decreases with increasing magnetic fieldH 0. 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 factorV max 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 thatV max 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01393261
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