Pseudo-spin rotational resonance and homonuclear dipolar N.M.R. of rotating solids
- 20 August 1989
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 67 (6) , 1419-1430
- https://doi.org/10.1080/00268978900101901
Abstract
The theory of homonuclear dipolar N.M.R. of rotating solids is presented. A pseudo-spin model is introduced to simplify the problem, and several special cases are discussed using average hamiltonian theory. For a homonuclear spin pair with a large isotropic shift difference (Δv iso), a resonance phenomenon occurs if the condition Δv iso = nωr is satisfied. Off resonance, a rotational Block-Sigert shift is expected. In the fast spinning limit, both the powder pattern lineshape and width can be analysed by this theory. In addition, under slow spinning, where the adiabatic approximation is valid for the motion of the pseudo-spin, the sample rotation experiment provides a means to demonstrate the geometrical Berry phase.Keywords
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