Band-selective excitation for multidimensional NMR spectroscopy

We have used this method to design radiofrequency pulse shapes which excite essentially pure absorption signals with a «top-hat» profile. That is to say, the absorption-mode signal is near unity over a prescribed range of frequencies ΔF and essentially zero elsewhere, except for two narrow transitional regions Δf wide on either side of the principal excitation. The dispersion-mode signal is kept small everywhere