Components: Spectrometer Frequency [sf]

The nuclei are excited by the radiofrequency pulse from a transmitter and upon returning back to thermal equilibrium during acquisition time induce a signal in the receiver coil which is detected as the NMR signal. The radiofrequency pulse has a characteristic frequency, named the spectrometer frequency (sf), which is dependent on the nucleus observed and the magnetic field strength of the NMR spectrometer used. For protons, sf on the Unity+300 is approximately 299.957 MHz, and on the VXR-S 400, it is 399.964 MHz. For carbons, sf on the Unity+300 is approximately 75.432 MHz, and on the VXR-S 400, it is 100.580 MHz. The spectrometer frequency specifies the center of the NMR spectrum acquired.