A 140Â GHz pulsed EPR/212Â MHz NMR spectrometer for DNP studies

► Spectrometer for pulsed EPR and DNP experiments at 140 GHz/211 MHz. ► Balanced helical cavity which serves as a EPR resonator and doubly tuned NMR coil. ► 6 MHz nutation frequency for S = 1/2 electrons, 100 kHz on 1H, and 50 kHz on 13C. ► Solid effect DNP enhancement of 144 and sensitivity gain of 310.