Dynamic Nuclear Polarization at 9.4 T with Closed-Circuit Liquid Helium

Phantom IRM

Typical DNP microwave profile: proton polarization P(1H) for a sample containing 80 mM TEMPOL as a function of the monochromatic microwave frequency without frequency modulation.

A novel system for dissolution dynamic nuclear polarization based on a cost-effective ‘‘cryogen-free” magnet that can generate fields up to 9.4 T with a sample space that can reach temperatures below 1.4 K in a continuous and stable manner. Polarization levels up to P(1H) = 60 ± 5% can be reached with TEMPOL in about 20 min, and P(13C) = 50 ± 5% can be achieved using adiabatic cross polarization.

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