par Lippens, Guy;Jeener, Jean 
Référence Concepts in Magnetic Resonance, 13, 1, page (8-18)
Publication Publié, 2001
Référence Concepts in Magnetic Resonance, 13, 1, page (8-18)
Publication Publié, 2001
Article révisé par les pairs
| Résumé : | We consider different aspects of the dipolar interaction between two magnetic moments. Both static and dynamics aspects are modeled through a "crawling ant" model. The static distribution describes the situation of a powder sample, where the different spin pairs corresponding to atom pairs on the individual molecules can have all possible orientations in space. The dynamics of the trajectory relates to the situation in a liquid, where every individual spin pair will adopt all orientations over time. We extend the model to the interaction with an orientation dependent dipole moment, and derive the well-known ring current shift. Finally, it is shown that imposing a macroscopic movement through sample spinning around a certain axis can reduce the dipolar interaction on the average to zero, which is the basis of the Magic Angle Spinning NMR experiment. © 2001 John Wiley & Sons, Inc. |
