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For the fee system, an atom in the bulk metal has 12 nearest-neighbor atoms (its coordination is 12); the number of surface atoms of given coordination for the five faces of Fig. 9 is given in Table 2. It can be easily understood that, in the fee system, a surface atom of coordination n has 12 - n "broken bonds". This is just a description based on the geometrical concept of "bonds"; no physical reality can be ascribed to it. A surface (hkl) can be represented by its outward normal h (having h, /c, / components); a bond can be specified by a vector u (having w, V, W components).

If) Growth from the Metal Vapor The collector [polished glass, cleaved mica, (100) face of a sodium chloride crystal, face of a metal, face of the metal] is maintained at a temperature below the melting point of the metal (in vacuum or in a neutral gas) so that crystal nuclei can be formed. The area of the film can reach several square centimeters. The metal is either evaporated or sputtered, so that either very thin layers or thicker layers are obtained. In the following paragraphs, some examples are given.

Without strong specific adsorption (Fig. 15). 49 Worse still may be potential steps, but the effect of these on the outermost-layer surface atoms has not been carefully studied. When some electroactive species exist in solution or at the surface of the metal, in the range of potential corresponding to the 42 A. Hamelin dl region, a current due to the electrochemical reaction is observed. For instance, the observation of the current corresponding to reduction of oxygen (from the air) in aqueous solution on gold (or silver) electrodes gives a good indication of the cleanliness of the interphase; the foot of the wave should be steep (as for solvent reduction), while in stirred solution the current should be diffusion controlled (Fig.

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