In order to better compare NMR spectra collected at different field strength, it has become custom to convert frequency to a dimensionless quantity called chemical shift with unit ppm (parts per ...

Every day, before measuring the "real" samples, acquire a 1H-NMR of a water sample and calibrate the water signal to 4.7 ppm using the fo-command (see step 5 above). If the spectrum for water doesn't ...

1.3 GHz 2D solids NMR: Ultra-Fast MAS 160 kHz solid-state NMR of tryptophan synthase (2 x 72 kDa), one of the largest enzymes studied by solid-state NMR. This 1.3 GHz spectrum was achieved with ...