Oblique total reflection at an unmagnetized plasma
= Oblique total reflection at an unmagnetized plasma
For vacuum incidence on a sharp planar, collisionless <plasma> interface, the transmitted normal <wavenumber> obeys $k_z^2=(\omega^2/c^2)(\cos^2\theta-\omega_p^2/\omega^2)$. Negative $k_z^2$ produces an evanescent field and total reflection in this lossless model.