The measurement of frequency separations in high resolution nuclear magnetic resonance spectra using a frequency modulated observing field

Abstract

A new method for the measurement of frequency separations in high resolution nuclear magnetic resonance spectra is presented. The method, which involves comparison of two points on the line profile, is shown to be capable of an internal precision of at least 2 mHz. Line separations measured in this way are shown to give results consistent with those obtained using a double-lock spectrometer and a nuclear double side-band oscillator.