|1H NMR Frequency||WB NMR Magnet||Gyrotron Frequency||Gyrotron Magnet|
|400 MHz||400/89 Ascend DNP||263 GHz||4.8 T cryogen-free|
|600 MHz||600/89 Ascend DNP||395 GHz||7.2 T cryogen-free|
|800 MHz||800/89 USP RS||527 GHz||9.7 T cryogen-free|
DNP experiments are performed at low temperature (100 K) for efficient transfer of polarization from electron spins to nuclear spins. Until recently, the spinning frequency at 100 K was limited to 15 kHz with a 3.2 mm rotor. With the introduction of the Bruker 1.3 and 1.9 mm low-temperature MAS (LTMAS) probe, DNP experiments can now be performed at up to 40 kHz (1.3) and 24 kHz (1.9) MAS MAS frequency for enhanced spectral resolution. The fast MAS probes include pneumatic insert/eject capability at ambient and cold temperature. The ability to change samples while the probe remains cold is critical for optimal use of experiment time. The probe is available with HCN, HXY, or HX NMR circuits.