Abstract
It is shown that in a solid which consists of CH 3 groups, even if thesegroups are non-isolated, spin diffusion is strongly limited due to the symmetry of a CH 3 group with respect to its neighbours. It is furthermore restricted under the condition ω 0⪢∥ d∥⪢ b, where ω 0 is the Zeeman splitting, d the intramolecular dipolar shift and b the intermolecular dipolar broadening. According to this “limited spin diffusion” model the relaxation of the longitudinal magnetization is in general determined by the sum of three exponentials. The result is in closer agreement with the experiments than the theory of Hilt and Hubbard where isolated CH 3 groups are considered.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
