Question: The pulse sequence for a constant time version of double-quantum filtered COSY is shown below. Show that, for a two-spin system and starting from z,

The pulse sequence for a constant time version of double-quantum filtered COSY is shown below.

Show that, for a two-spin system and starting from z, the double quantum present between the final two pulses is given by

Determine the effect of the final pulse on this double-quantum state, and hence predict the form of the diagonal- and cross-peak multiplets. Does double-quantum filtration have any practical benefits in this experiment?

t1 cos (ath)sin (r()

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