  Statistical properties of Wigner delay times and the effect of evanescent
modes on the deterministic scattering of an electron matter wave from a
classically chaotic 2-d electron waveguide are studied for the case of 2, 6,
and 16 propagating modes. Deterministic reaction matrix theory for this system
is generalized to include the effect of evanescent modes on the scattering
process. Inclusion of evanescent modes can change the positions of resonance
poles in the complex energy plane and can delay electron scattering,
particularly at energies where new channels open. The statistical properties of
the Wigner delay times for the deterministic scattering process are compared to
the predictions of random reaction matrix theory.
