Proton-enhanced deuterium NMR in rotating solids
✍ Scribed by L. Müller; R. Eckman; A. Pine
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 521 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Protoninhanced deutenum NhlR spectra hare been obtamed III rotatmg sohds wth substantnlgaln III scnsrtwrty. Cross polarlzatlon from proton to deutermm systems occurs VEI effective field mutual smglequantum fhp-flops.
Sample rotation
modulates the deutenum quadrupole couplmng which leads to complex dynamrcs and broad Hartmann-Hahn matchmg condltlons
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High resolution ~9F NMR spectra of rotating polycrystalline solids can be obtained by single pulse excitation with a long delay before acquisition (SPEDA). However, the overall spectral range is influenced by the chemical shift anisotropy which, unlike the situation for protons, might be large for 1
SelectIre NhlR TI mrasurements on dcutermm m pouders rotatrng at high speed at the magtc angle mdtcate that dlpolat spm dlffusmn ~~hich can bc quenched by the ortentattonal dependence of the quadrupole spbttmg, IS partially restored by the simple rotatton
## Abstract ^1^H NMR spectra of the methyl group in an oriented crystal sample of methylmalonic acid with all three non‐methyl protons replaced by deuterons are interpreted in terms of the damped quantum rotation (DQR) theory of NMR line shapes. The DQR approach offers a perfect theoretical reprodu
An anaiytic11 expression has been obtained for the spin response to a resomnt YO"-r-fig puIse sequenrr for a model of two dipoiar coupled spins-l. each subject to local electric field gradients\_ The faihrre of the "time-xpansion method" to account for previous experimental observations on deuterium