A Simple Modification for Observing A Variety of Nuclei in NMR Spectroscopy

Abstract

A method is described for observing a variety of nuclei in NMR spectroscopy, either in the cw or FT mode. The method basically involves raising or lowering the magnetic field. A simple modification of the lock channel is described that can maintain a field‐frequency lock at the new field strength. Thus, at the new field, other nuclei can be resonated with one of the spectrometer transmitters and receivers used for another nucleus. The equipment required is a frequency synthesizer and two rf mixers. The method can be extended to include additional nuclei observed in the FT mode if another rf mixer and a wide‐band power amplifier are used.