Proton spectra of solids are usually broadened by strong proton homonuclear dipolar interactions. However, substantial line narrowing may be achieved by Magic Angle Spinning (MAS) in systems of low proton density or in systems in which rapid molecular motions occur. In such conditions, T1(H) measure
Effects of magic-angle spinning on spin-lattice relaxations in talc
β Scribed by Shigenobu Hayashi
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 653 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0926-2040
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π SIMILAR VOLUMES
Spin-lattice relaxation mechanisms in kaolinite have been reinvestigated by magic-angle spinning (MAS) of the sample. MAS is useful to distinguish between relaxation mechanisms: the direct relaxation rate caused by the dipole-dipole interaction with electron spins is not affected by spinning while t
We determine the decay rate constants of zero-, double-and single-quantum coherence for 13 C spin pairs in magic-angle-spinning solid-state NMR. The double-quantum coherence is excited by a C7 pulse sequence and converted into zero-quantum coherence by a frequency-selective pair of pr2 pulses. The z
A practical method is described for measuring the principal values of the chemical shift tensors in compounds with very long proton spin-lattice relaxation times (T1). This technique involves shortening the effective proton T1. by mixing a compound of interest with another compound having a much sho