EFFECT OF RESONANCES ON DIFFUSIVE SCATTERING

The presence of resonances modifies the passage of light or of electro ns through a disordered medium. We generalize random-matrix theory to account for this effect. Using supersymmetry, we calculate analyticall y the mean density of states and the effective Lagrangian of the gener ating functional for the two-point function. We show that the diffusio n constant scales with the effective mean level spacing. The latter ex hibits a resonance dip. These facts allow us to interpret experimental results on light scattering for different concentrations of resonant scatterers.