Abstract
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. However, it is beset by the problem of an instrumental dead time, which prevents observation of the initial portion of the envelope. A technique for estimating the form of this initial portion and thus minimizing the spectral artifacts associated with the dead time is described here. It is illustrated with both simulated and experimental echo envelope data.
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