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. Author manuscript; available in PMC: 2013 May 31.
Published in final edited form as: J Phys Chem A. 2012 May 18;116(21):5129–5138. doi: 10.1021/jp302399f

Figure 4.

Figure 4

Microwave DNP spectra of 1:1 [1-13C]pyruvic acid:sulfolane samples doped with a) 40 mM BDPA and b) 40 mM BDPA plus 5 mM Gd3+. These data were taken in the HyperSense at 3.35 T and 1.4 K using a 100 mW microwave source. The up and down arrows indicate the approximate locations of the positive and negative polarization peaks, respectively.