We have experienced ghosts or what appears to be artifacts from the
solvent peak, acetone, in C-13 spectra. These appear at irregular intervals
from the solvent peak, 4550 Hz, 9524 Hz and 14164 Hz. These are clearly
ghosts of the main CD3 multiplet at 20 ppm, given the coupling pattern. They
are negatively phased relative to the main solvent peaks, and
unfortunately, interfer with the sample peaks.
Does anybody have an idea where these peaks might come from and what we
can do about it?
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Richard Fronko
DCC Manager
Microcide Pharmaceuticals, Inc.
650-428-3516 voice
650-526-3034 fax
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