Nuclear magnetic resonance , solids magic angle sample spinning

W.L. Earl, D.L. Vanderhart, Observations in solid polyethylenes by C-13 nuclear magnetic-resonance with magic angle sample spinning. Macromolecules 12 (1979) 762-767. 

Both of these methods have been used for DOM isolation from major rivers and the surface ocean, and the general characteristics of these fractions of DOM are presented in Table I. The major C functional groups of humic substances and ultrafiltered DOM (UDOM) have been characterized by solid-state, cross-polarization magic angle spinning 13C nuclear magnetic resonance (NMR) spectroscopy. The samples of humic substances that were characterized by NMR spectroscopy were collected from the Amazon River... 

Nuclear magnetic resonance (NMR) spectroscopy is most frequently used to analyze liquid samples, but in the magic angle spinning (MAS) mode, this spectroscopy can also be employed to characterize solid catalysts, zeolites in particular [116-120], For example, the 29Si NMR signal can... 

Solid-state C variable-amplitude cross polarization magic-angle spinning (VACP/MAS) nuclear magnetic resonance (NMR) spectra were acquired for the sorbitol samples. Proton decoupling was achieved by a two-pulse phase modulation (TPPM) sequence. Identical C spectra were measured for the y-form sorbitol samples, and a representative spectrum is shown in Figure 9. 

Table 2.10. Solid-state cross-polarization magic angle spinning nuclear magnetic resonance spectroscopic studies of environmental samples.

FIGURE 2.12 Results of variable contact time (VCT) experiments for the aromatic peak in the cross-polarization (CP)/magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectrum of a lignite sample. The solid line is a fit to Equation (2.17). (Reproduced from Pan, V.H., and Maciel, G.E. The analysis of three representative premium coals by 13C nuclear magnetic resonance. Fuel 1993 72(4) 451-468. With permission from Elsevier.)... 

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