Check out the recent post that I wrote for Agilent’s Spinsights blog that gives a historical overview and timeline for DNP spectroscopy.
http://www.spinsights.net/2012/08/dynamic-nuclear-polarization-a-historical-overview/
DNP is not a new technique and is almost as old as the first EPR or NMR experiments. However, with it’s recent gain of interest in the structural biology or material science community it is often forgotten that DNP was and still is extensively used in particle physics (polarized targets). Even polarizing agents based on nitroxides were already used back in the 1960’s. So, check out the DNP timeline that I put together and let me know if I missed an important milestone contribution in DNP.