#% , where ω !" is the nuclear Larmor frequency, usually of protons. In the case of the SE the source of this dependence is the fact that 𝜀~(𝜔 $& 𝜔 !" ⁄ ) and ω !" is increasing while ω $& , the electron Rabi field, is constant. In particular, raising 𝜔 $& requires unacceptable increases in the CW microwave power applied to the sample. In contrast, coherent or pulsed DNP mechanisms, which manipulate the microwave (µw) frequency, phase, and amplitude, have low duty cycles (~1%) and even substantial pulse power results in low average power. Furthermore, once the pulse power is available the sequences should behave like INEPT and cross polarization transfers in NMR, which are field independent. Thus, pulsed experiments can substantially mitigate the field dependence of the enhancement and should provide a promising approach to improve sensitivity in acquisition of high field NMR spectra.