Linewidth of the NMR Signal

In order to fully characterize a signal in a NMR spectrum one should hst its position (chemical shift), multiplicity (splitting pattern), coupling constant (J) and its linewidth at half-height (Avi/2). 

Small linewidths b) are characteristic for long T2 relaxation times as in liquids, whereas large linewidths c) are typical for short relaxation times as in solids. 

Finally we should mention that in some cases the NOE effects are unwanted, for instance when exact quantitation is required. In such cases, special experimental measures should be taken, on one hand to minimize the induced NOE and on the other hand to allow sufficient time for any residual NOE to vanish before collecting a new set of data. 

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Experimental Linewidths of the NMR Signals Arising from Cysteine H/3 Protons... 

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