Fig. 4: Static DNP-enhanced NMR of microstructural lithium.

⁷Li NMR spectra of sample C, recorded with and without microwave irradiation at 263.7 GHz and 44 W, at 9.4 T and room temperature, using a Hahn echo pulse sequence, a 0.25 s recycle delay and 128 scans. Shown too are the enhancements by area of the different signals.