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2ibxia

- 2iaxib

(receiver phase x') (receiver phase - /) (receiver phase - x') (receiver phase y')

(receiver phase x') (receiver phase - /) (receiver phase - x') (receiver phase y')

As before, we use the table to adjust the phase according to the reference axis for each scan. Now we see that the 2IaIb terms alternate sign and cancel as we move from first scan, first term to second scan, second term to third scan, first term and finally to fourth scan, second term. Likewise, the 21^ terms alternate sign and cancel as we move down. So the ZQC, which exists between the second and third pulses of the DQF-COSY pulse sequence (Fig. 10.28) does not contribute anything to the observed FID after four scans. Just for completeness, we can show that all of the other terms present at the end of the 90X —i1—90X sequence are also destroyed by the phase cycle

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