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COSY and spin-lock experiments

In the case in which T l is laiger than J, one would think that the antiphase character of the cross peaks in the TPPI mode cancels partially or totally the cross peaks. Indeed, much of the intensity of the signal is lost. The loss can, however, be reduced if the cross peaks are phased in dispersion mode [48] or if the experiments are performed in magnitude mode [36] (Section 8.5). The occurrence of coherence transfer phenomena may give rise to COSY cross peaks even in the absence of scalar coupling (Section 8.8) [35]. As long as this is kept in mind, COSY cross peaks between very broad lines can be looked for, and interpreted as dipolar correlation cross peaks. [Pg.321]

TOCSY spectra are critical to perform on paramagnetic systems when the required spectral window is large, because of the need to irradiate the spectral window efficiently with each component of a long train of many pulses (like for instance the MLEV17 sequence [49], Fig. 9.1L). Overheating of the sample can [Pg.321]


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