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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 7.

Figure 7

Microwave DNP spectra of 100 μL samples of 1.4 M [1-13C]pyruvate in 1:1 (v/v) glycerol:water doped with a) 40 mM 4- oxo-TEMPO and b) 40 mM 4-oxo-TEMPO and 3.5 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 arrows indicate the approximate location of the positive polarization peak. Due to the limited microwave frequency range of the source, measurement at frequency ωe>94.30 GHz, where the negative polarization peak is located, is not accessible.