Question: Draw up coherence transfer pathways for the following experiments, and explain how gradients could be used to select the specified pathways. In some cases you

Draw up coherence transfer pathways for the following experiments, and explain how gradients could be used to select the specified pathways. In some cases you may need to modify the pulse sequences, for example, by the inclusion of extra refocusing pulses. Determine the relative strengths of any gradient pulses you propose to include.
(a) P-type DQF COSY (i.e. p = -1 during t1) (absolute value display).
(b) N-type triple-quantum filtered COSY (i.e. p = +1 during t1) (absolute value display).
(c) N-type COSY (absolute value display).
(d) Double-quantum spectroscopy, intended to give an absorption mode spectrum (i.e. refocusing phase errors due to gradients, and recording separate P- and N-type spectra).
(e) N-type HSQC (absolute value display) for 1H-13C correlation.

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a Ptype DQF COSY We have chosen p 2 in the interval between the last two pulses but it would have been just as acceptable to choose p 2 The pathway wi... View full answer

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