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• W4249238730 abstract "An analysis is made of frequency-selective radiofrequency pulses used for high-resolution NMR studies of liquids. If the pulse envelope is rectangular, there are extensive sidelobes in the frequency-domain excitation pattern, whereas a Gaussian envelope gives a frequency-domain pattern (for the absolute-value mode) that is a slightly distorted Gaussian with no sidelobes. This affords much better selectivity. Furthermore the Gaussian pulse excites a signal with a phase angle which is almost a linear function of offset. The calculations are based on magnetization trajectories predicted by the Bloch equations, neglecting relaxation. It is shown that at appreciable offsets from resonance the Gaussian pulse produces a characteristic “teardrop” trajectory which always terminates near the +Z axis, irrespective of offset ΔB. Examples of applications of Gaussian-shaped pulses include the investigation of the fine structure on carbon-13 resonances, selective coherence transfer experiments between protons, and nuclear Overhauser effect measurements in crowded proton spectra." @default.
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• W4249238730 date "1984-07-01" @default.
• W4249238730 modified "2023-10-14" @default.
• W4249238730 title "Gaussian pulses" @default.
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• W4249238730 doi "https://doi.org/10.1016/0022-2364(84)90148-3" @default.
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