Abstract
Artifacts which cannot be removed from quadrupole echo spectra by phase cycling can be distinguished from the desired echo on the basis of their response, or lack thereof, to the refocusing pulse. In particular, the phase of the virtual FID or feedthrough signal is determined exclusively by the phase of the first 90° pulse in the 90 x - τ-90 y sequence. At the peak of the echo, therefore, the phase of the virtual FID varies with r, while that of the echo does not. Two procedures are described which make use of this phenomenon to eliminate contributions of the virtual FID to the echo lineshape. In addition an interpolation procedure is described which in effect permits a data set to be left-shifted by fractions of a dwell time, so that the first data point can be placed exactly at the top of the echo.
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