sequence, since only the wanted coherences reach the receiver. To help in understanding the experiments described, the coherence pathway diagrams [7] are given below for many of the pulse sequences in this book; the pulsed field gradients are represented by g.

This 1D chapter on pulsed field gradients aims first to give a working understanding of the equipment in use by providing several calibration experiments (Exps. 11.1–11.4). Then we show how to measure diffusion constants (Exp. 11.5) and include three educational experiments on gradient-supported filter techniques (Exps. 11.7–11.9), which are building-blocks in many other experiments. Several more advanced experiments employing both selective pulses and pulsed field gradients are demonstrated as applications for organic chemistry (Exps. 11.10–11.15), since this combination seems to be widely used and of practical importance.

Also included are three methods of water suppression, WATERGATE, Excitation Sculpting, and WET (Exps. 11.16–11.18). As the conclusion for this chapter we demonstrate three varieties of DOSY, two of which belong formally in this 1D chapter since the DOSY method, despite the form in which the spectra are displayed, does not constitute a true 2D method. The DOSY-HMQC experiment, a true 2D technique, is included here because of the close relationship to the two preceding experiments.

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