Elimination of the dead-time artifact in electron spin echo envelope spectra.

The electron spin echo decay envelope is commonly observed to be modulated by frequencies characteristic of nuclei situated near the electron spin. Fourier transformation of this envelope can therefore be made to yield a spectrum similar to the ENDOR spectrum. The echo envelope method possesses some advantages over the ENDOR method, in particular when the electron-nuclear coupling is weak, or when the sample can only be prepared in frozen solution or powder form.