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We consider a model of Raman scattering for a two--dimensional $S=1/2$Heisenberg Anti-Ferromagnet which includes a {\it dynamical} spin--phononinteraction. We observe a broadening of the line shape due to increasedcoupling with excited high--energy spin states. Our results are close to amodel of random static exchange interactions, first introduced in this contextby Haas {\it et al.} [J. Appl. Phys. {\bf 75}, 6340, (1994)], which, whenextended to large numbers of spins, explains experiments in the parentinsulating compounds of high-$T_c$ superconductors.Comment: 14 pages (revtex format), 8 postscript figure

Two-magnon scattering and the spin-phonon interaction beyond the adiabatic approximation