Author： de Sousa P.L. de Souza R.E. Engelsberg M. Colnago L.A.
Publisher： Academic Press
ISSN： 1090-7807
Source： Journal of Magnetic Resonance, Vol.135, Iss.1, 1998-11, pp. : 118-125
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Abstract
The dependence of the enhancement of proton–electron double-resonance images upon the mobility of the proton bearing molecules, of the concentration of free radicals, and of the pulsed saturating RF power is studied in a magnetic field of 16 mT. The data exhibit a behavior which, in the potentially interesting region of small free radical concentration, may differ substantially from the high-concentration regime depending upon experimental conditions. The results permit a clearer understanding of the factors determining enhancement and contrast in images obtained by dynamic nuclear polarization.
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