Abstract
Incomplete relaxation lowers the quality of two-dimensional COSY spectra by introducing artifacts at integral multiples of the resonance offset in the F1 dimension. These artifacts can be minimized by rearranging the order in which the data are collected. Three different data-acquisition schemes are examined: interleaved hypercomplex data acquisition, transposed acquisition, and conventional data acquisition. Practical results are compared with theoretical predictions based upon product-operator calculations. Transposed data acquisition is superior to interleaved hypercomplex data acquisition, which in turn is superior to conventional data acquisition in situations where very short phase cycles are employed without the use of dummy transients. However, conventional data acquisition becomes more advantageous as the length of the phase cycle rises.
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