Relaxometry of insensitive nuclei: Optimizing dissolution dynamic nuclear polarization

► We measured I1 of carbon-13 as a function of B0 in view of optimizing dissolution-DNP. ► The sample is lifted into the stray field above a high-resolution magnet using a simple “shuttle”. ► The signals of arbitrary molecules are observed at high field with high resolution and sensitivity. ► In dissolution-DNP relaxation occurs during the “voyage” from the polarizer to the NMR magnet. ► Relaxation can be limited by using scavengers or by sustaining the magnetic field during the sample “voyage”.