Simulation of coherent radiofrequency superradiation from disordered spillsystems

We discuss the coherent behavior of a highly polarized, nuclear or electron , spin system for which the magnetic dipole radiation, emitted in the radio frequency region, has a quadratic dependence on the number of spins. Phenom enological theories are unable to completely predict many of the features o f low temperature spin systems. Computer simulations provide a very effecti ve and accurate method of describing such systems. Our investigation is bas ed on a microscopic model, which makes it possible to accurately analyze th e role of dipole interactions and inhomogeneous widening. The description o f these systems requires the solution of a large number of coupled differen tial equations. In solving the equations we apply different parallel comput ing methods comparing their efficiency with traditional 'serial' schemes. ( C) 1999 Elsevier Science B.V. All rights reserved.