Physics – Chemical Physics
Scientific paper
2011-03-16
JETP, Vol. 113, No. 3, pp. 495-501 (2011)
Physics
Chemical Physics
11 pages 4 figures
Scientific paper
The multiple quantum (MQ) NMR dynamics in the system of equivalent spins with the dipolar ordered initial state is considered. The high symmetry of the MQ Hamiltonian is used in order to develop the analytical and numerical methods for an investigation of the MQ NMR dynamics in the systems consisting of hundreds of spins from "the first principles". We obtain the dependence of the intensities of the MQ NMR coherences on their orders (profiles of the MQ NMR coherences) for the systems of $200 - 600$ spins. It is shown that these profiles may be well approximated by the exponential distribution functions. We also compare the MQ NMR dynamics in the systems of equivalent spins having two different initial states, namely the dipolar ordered state and the thermal equilibrium state in the strong external magnetic field.
Doronin Sergei I.
Fel'dman Edward B.
Zenchuk Alexander I.
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