3. Detection modes
The technique used initially was continuous-wave NMR. The B 1 field is then of very low intensity. Resonance is obtained by slowly varying B 0 at a constant B 1 frequency or conversely the B 1 frequency at a fixed B 0 field.
Pulse NMR is the current technique for obtaining all the information contained in the overall magnetization of a sample, even when dealing with low-sensitivity nuclei of low natural abundance, such as
13
C (1.108%),
15
N (0.37%), or low gyromagnetic ratio, such as
103
Rh
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