  Based on a modified Anderson-Weiss approximation (N. Fatkullin, A.
Gubaidullin, C. Mattea, S.Stapf, J. Chem. Phys. 137 (2012), 224907) an improved
theory of proton spin solid echo in polymer melts is formulated, taking into
account contribution from intermolecular magnetic dipole-dipole interactions.
The solid echo build-up function defined by the relation , where , and are the
respective signals arising from ( ),( ) and ( ) spin echo experiments, where is
an operator rotating the spin system on the angle relatively axis , is
investigated. It is shown that the intermolecular part of this function at
short times , where is a characteristic time for flip-flop transitions between
proton spins, contains information about the relative mean squared
displacements of polymer segments at different macromolecules, opening up a new
opportunity for obtaining information about polymer dynamics in the millisecond
regime.
