Electron-nuclear double resonance

Electron-nuclear double resonance:

 (ENDOR) A magnetic resonance spectroscopic technique for the
determination of HYPERFINE interactions between electrons
and nuclear spins. There are two principal techniques.
In continuous-wave ENDOR, the intensity of an ELECTRON PARAMAGNETIC RESONANCE (EPR) signal, partially saturated with microwave power, is measured as radio frequency is applied. In pulsed ENDOR, the radio frequency is applied as pulses, and the EPR signal is detected as a spin echo. In each case an enhancement
of the EPR signal is observed when the radio frequency is in resonance with the coupled nuclei.