  The plasma-material interactions present in multiple fusion and propulsion
concepts between the flow of plasma through a channel and a material wall drive
the emission of secondary electrons. This emission is capable of altering the
fundamental structure of the sheath region, significantly changing the expected
particle fluxes to the wall. The emission spectrum is separated into two major
energy regimes, a peak of elastically backscattered primary electrons at the
incoming energy, and cold secondary electrons inelastically emitted directly
from the material. The ability of continuum kinetic simulations to accurately
represent the secondary electron emission is limited by relevant models being
formulated in terms of monoenergetic particle interactions which cannot be
applied directly to the discrete distribution function. As a result, rigorous
implementation of energy-dependent physics is often neglected in favor of
simplified, constant models. We present here a novel implementation of
semi-empirical models in the boundary of continuum kinetic simulations which
allows the full range of this emission to be accurately captured in
physically-relevant regimes.
