Nonlocal corrections to Fresnel optics: Model calculations from first principles for flat jellium

New calculations of the Feibelman d parameters below the bulk-plasma frequency are presented for first-principles models of a jellium metal surface. We employ for the surface potential-energy barrier that confines the electrons the results found earlier by Lang and Kohn using a local-density-functional approach. The dynamic response is calculated both within the random-phase approximation and within the time-dependent local-density-functional approximation. There is little qualitative difference between the two when the density parameter rₛ=2. Along with the d parameters, we exhibit the distribution of screening charge and total normal electric field. Various structures that appear in the frequency dependence of the response are identified and discussed.