Multiple quantum NMR spin dynamics arising from a two-quantum/two-spin non-secular average dipolar Hamiltonian are solved exactly for an infinite one-dimensional (l-D) quantum spin 1/2 chain with nearest-neighbor dipole-dipole interactions and initially at thermal equilibrium in a Zeeman field. Usin
1H and 19F Multiple-Quantum NMR Dynamics in Quasi-One-Dimensional Spin Clusters in Apatites
β Scribed by Cho, Gyunggoo; Yesinowski, James P.
- Book ID
- 115482486
- Publisher
- American Chemical Society
- Year
- 1996
- Tongue
- English
- Weight
- 451 KB
- Volume
- 100
- Category
- Article
- ISSN
- 0022-3654
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Mukiple-quantum NMR dynamics are reported for the quasi-one-dimensional distribution of uniformly spaced proton spins in hydroxyapatite, CLJ,(OH)(PO,)~, using a phase-incremented even-order selective time-reversal pulse sequence. The initial increase of the effective size N with the preparation time
The cross-polarization dynamics between 1 H and 19 F in a Viton-type fluoroelastomer were studied using 19 F magic angle spinning (MAS) and 1 H ! 19 F cross-polarization (CP)/MAS NMR at 188.29 MHz. The phenomenological theory of spin thermodynamics based on the spin temperature hypothesis was employ