M.A. Lutz, R.M. Feenstra, et al.
Surface Science
In the high-frequency limit, general expressions for second- and third-order induced electronic current densities in a medium are derived. These are valid for any medium with arbitrary spatial electronic-density variations. It is shown that the second-order current density at x-ray frequencies depends directly on the gradient of the unperturbed electronic density, so that it is sensitive to density variations both near the surface and near the ionic cores in a solid. © 1972 The American Physical Society.
M.A. Lutz, R.M. Feenstra, et al.
Surface Science
Eloisa Bentivegna
Big Data 2022
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
Heinz Schmid, Hans Biebuyck, et al.
Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures