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- W2006505871 abstract "Modern high resolution NMR spectrometers employ the Fourier transform method where the entire spectrum is uniformly excited by a “hard” radiofrequency pulse. Occasionally, information is more easily extracted by an experiment where the excitation is selective in the frequency domain, using a “soft” radiofrequency pulse. We may select a single transition, an entire spin multiplet or an extended range of chemical shift frequencies for the excitation. In the early experiments, simple rectangular-shaped pulses were used, but much better results can be achieved by suitably shaping the envelope of the pulse. Several interesting schemes have been explored for designing pulse shapes, including simulated annealing, computer-simulated neural networks and evolutionary strategies that mimic the processes of natural selection. Selective pulse excitation has been used for relaxation time measurements, solvent peak suppression, resolution enhancement, separation of overlapping two-dimensional multiplets, improving the definition of fine structure in two-dimensional spectroscopy, and for reducing the time penalty associated with three- or four-dimensional NMR." @default.
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- W2006505871 date "1992-03-01" @default.
- W2006505871 modified "2023-09-23" @default.
- W2006505871 title "High resolution NMR using selective excitation" @default.
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- W2006505871 doi "https://doi.org/10.1016/0022-2860(92)80048-m" @default.
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