As expected, the zinc oxide signal (figure ) consists mostly of background signal from the probe and sample vessel. The signal intensity is very weak since there is very little hydrogen present. The major peaks have T1 values of 140 ms and 960 ms, and T2* values of 10 µs and 12 µs. The 2-methylimidazole 2D plot (figure ) indicates one short lifetime T2* signal at 9 µs. The major peak has a T1 value of 24.9 s. We posit that the smaller less intense peak with a T1 of 0.17 s comes from background signal. For 2-methylimidazole, the decay is sinc-gaussian (SM, see section S3). Zinc acetate dihydrate has four peaks with T2* values of 6 µs and 19 µs and T1 values of 0.15 s and 30.9 s (figure ).