Stationary transport with partially reflecting boundary conditions. II

We consider the stationary monoenergetic transport equation (the Lorentz model) in a semiinfinite geometry with most general nonmultiplying boundary conditions at the wall x = 0, accounting for absorption, specular, diffuse, and "selective" reflection, or combinations thereof. Performing the numerical study of a (partially) "thermalizing" wall, we investigate the density profile n(x), the Milne extrapolation length x_M, and the space dependent diffusion coefficient D(x) as functions of the accommodation and "selection" coefficients. The inversed density profile (equivalent to a negative diffusion coefficient) is numerically computed. As a simple analytically solvable example, a discrete velocity model is discussed in the Appendix.