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C. metals Al, Ag, Au, Cu, Ni, Pd, P t exhibit only slight texture, if any. However, the hexagonal Bi, Mg, Sb, Zn and tetragonal Sn tend to form deposits on which the close-packed or (0001) planes lie parallel to the substrate. The development of this texture with thickness for Sn was demonstrated in Figure 5 by the diffraction patterns; in a corresponding set of experiments with Cu, no texture was detected. Facets on the surface may be formed either as an equilibrium state, or as a consequence of a growth process.

Species which are labelled in this way are followed with a counter (Korff, 1946). Radioactive krypton (Aylmore and Jepson, 1961) and xenon (Chenebault and Schürenkämper, 1965) have been applied to the measurement of small surface areas. IV. PRESSURE MEASUREMENT AND GAS ANALYSIS There are no experiments involving metal films and gases which do not require the measurement of pressure. Pressure readings are needed to define conditions over the film and they enable gas uptakes to be assessed. Thus once the various volumes of the apparatus have been established, pressures may be converted into gas quantities (Knor, 1967).

H E A T S OF ADSORPTION XIV. MEASUREMENTS OF ELECTRICAL CONDUCTIVITY . 84 85 85 90 92 93 96 96 98 103 39 104 . 107 40 XV. DEREK F. KLEMPERER SURFACE A R E A DETERMINATION A. PHYSICA L ADSORPTIONMETHODS B. CHEMISORPTIONMETHODS XVI. STICKING PROBABILITIES REFERENCES I. , 1940). , 1953). Films have now been turned to nearly every type of measurement and it is the purpose of this chapter to review the techniques by which these ascetically pleasing specimens are prepared and used. The introduction of ultrahigh vacuum techniques (Alpert, 1953, 1958) has complemented the metal film technique in t h a t it is not only possible to produce atomically clean specimens but, with ultrahigh vacuum, to maintain them for the experimental duration.

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