On the Study of Diffusion Using Spin Echoes

The decay of the primary spin echo due to diffusion is governed by the expression [Formula: see text]. This statement is independent of the angles through which the magnetization is rotated by the radio frequency (r-f.) pulses. For the usual range of experimental values, it is also independent of the intensity or homogeneity of the r-f. field, the duration of the r-f. pulse, and the magnitude of the constant field gradient.