Adsorption on ordered surfaces of ionic solids and thin films : proceedings of the 106th WE-Heraeus Seminar, Bad Honnef, Germany, February 15-18, 1993 - W.E. Heraeus Seminar; Umbach, E. (Eberhardt); Freund, H.-J. (Hans-Joachim) (Springer series in surface sciences, 1993)