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May I caution against making the description excessively simple - the accuracy suffers.
Question edit
An early paragraph in this article describes the polarisation method as "Because the magnetic moment of an electron is more than 600x that of a proton, the spins of many protons are polarized beyond the usual thermal Boltzmann distribution." I thought the polarisation occurred because some nuclear spins favour the triplet recombination while others allow the radicals to wander off and react elsewhere. This is what causes the non-Boltzmann distribution of proton spins. The electrons are not changing the spins of the protons. I am an ex-Cidnipper from 1972. JMcC (talk) 15:03, 29 January 2021 (UTC)