> We recently ran some 14N spectra on a DRX-400. We used
> edasp to set the 14N frequency and set SR=0 for processing.
> Does anyone know what chemical shift reference SR=0
> approximately refers to in this case?
> Thanks.
>
> ******************************************
Dear Dr. Leek,
Please, look for a small and arbitrary narrow signal of N2-gas
from atmospheric air, dissolved in your samples. The chemical shift of
this signal is approximately -72 ppm. The primary chemical shift
standard for N-14 NMR is nitromethane at 0.0 ppm. Solvent dependence
of nitrometane shemical shift is ~5 ppm.
With best wishes and kind regards, Yuri Strelenko.