2,517 research outputs found
Multiple Quantum NMR Dynamics in Pseudopure States
We investigate numerically the Multiple Quantum (MQ) NMR dynamics in systems
of nuclear spins 1/2 coupled by the dipole-dipole interactions in the case of
the pseudopure initial state. Simulations of the MQ NMR with the real molecular
structures such as six dipolar-coupled proton spins of a benzene, hydroxyl
proton chains in calcium hydroxyapatite and fluorine chains in calcium
fluorapatite open the way to experimental NMR testing of the obtained results.
It was found that multiple-spin correlations are created faster in such
experiments than in the usual MQ NMR experiments and can be used for the
investigation of many-spin dynamics of nuclear spins in solidsComment: 8 pages, 2 figure
Multiple Quantum NMR and Entanglement Dynamics in Dipolar Coupling Spin
We investigate numerically the time dependence of the multiple quantum
coherences and entanglement in linear chains up to nine nuclear spins of 1/2
coupled by the dipole-dipole interactions. Two models are considered: (1) a
spin chain with nearest-neighbor dipole -dipole interactions; (2) a more
realistic model with interactions between all spins. It is shown that the
entangled states appear between remote particles which do not interact directly
(model 1), while the interaction between all spins (model 2) not always results
in entanglement between remote spins.Comment: 14 pages, 3 figures. accepted for publication in Physical Review
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