Coil homogeneity and the effect of rotor filling on the spectral resolution

2009

Spectral resolution depends upon the length (N) of the transform interval: N=F/ f, where f is the smallest frequency difference which can be distinguished at a given sampling frequency F. f depends on the signal width, which, in turn, is influenced by the relaxation time of the sampled signal. Relaxation time is affected by the external magnetic field and the applied pulse sent to the sample through the transmitter/receiver coil. The pulse length homogeneity throughout this coil is a major factor affecting NMR resolution and also the sensitivity of the measurement. So far, this fact is only considered when small sample amounts are used, where care should be taken to place the sample in the …

Effect of wetting/drying on the conformational arrangement of a heterogeneous organic mixture as assessed by solid state 13C NMR spectroscopy

2008

New understanding of cross-polarization dynamics in amorphous and heterogeneous natural organic substances

2008

Solid state NMR spectroscopy in the evaluation of the conformational changes of humic substances as affected by thermal variations

2009