1. a) Somorjai, G. A.: Chemistry in two dimensions: Surfaces. Ithaca: Cornell Univ. Press 1981 b) Methods of surface analysis (A. W. Czanderna, ed.). Amsterdam: Elsevier 1975 c) Ertl, G., Küppers, J.: Low energy electrons and surface chemistry. Weinheim: Verlag Chemie 1974 d) Characterisation of catalysts (J. M. Thomas and R. M. Lambert, eds.). New York: Wiley 1980 e) Experimental methods of surface physics (R. L. Park, ed.). To be published
2. Somorjai, G. A.: Adv. Catalysis 26, 2 (1977)
3. Boudart, M.: ibid. 20, 153 (1969) and references therein
4. High-pressure cells combined with UHV techniques have been developed in various laboratories
5. a) Wedler, G.: Chemisorption: An experimental approach, 2nd ed. London: Butter-worths 1976 b) Roberts, M. W., McKee, C. S.: Chemistry of the metal-gas interface. Oxford: Clarendon Press 1978 c) The nature of the surface chemical bond (T. N. Rhodin and G. Ertl, eds.). Amsterdam: North Holland 1979 d) The chemical physics of solid surface and heterogeneous catalysis (D. A. King and D. P. Woodruff, eds.). In press