investigated['', and the "escape depth" for electrons liberated from a metal by the action ofx-rays has been determined The valence bands in LiF, BeO, BN, and graphite have also been studied, and the results compared with X-ray spectroscopic data" 'I; see Figure 20.We have also studied the valence bands in transition metals and other solids"** 'I. Figure 21 shows electron spectra from the valence bands of twelve transition metals. After certain corrections, these ESCA spectra provide a very good description of the energy distribution in the bands.It is my pleasure to thank Professor Kai Siegbahn and all the other members of our research group in Uppsala for their contribution to the work that led to the results presented here. [A 858 IE]

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Articles you may be interested inLiquid-vapor equilibrium and surface properties of short rigid chains with one long range attractive potential J. Chem. Phys. 139, 024505 (2013); 10.1063/1.4813069Forces between polystyrene surfaces in water-electrolyte solutions: Long-range attraction of two types?The assumption of locally additive forces is used to describe the London-van der Waals dispersion attraction between long saturated chains. For two linear chains of length L, opposed and parallel, each built out of N identical units of length X(NA= L), the total dispersion energy is given byP=!:. . . ,where D is the mutual distance of the two chains; A is the coefficient of the dispersion interaction between two basic units. At distances D much smaller than the molecular length L, the energy becomes proportional to L (or N) and inversely proportional to the fifth power of the intermolecular distance.The coefficient A is calculated for the interaction between two CH. units in hydrocarbon chains and the result is used to estimate the sublimation energy at OaK of paraffin crystals. Sound agreement with experiment is obtained. Finally, the particularities of the attractive forces between long saturated chains are examined in more detail and their great sensitivity to distance is shown by several examples. Various applications to systems of biological interest are also suggested.

co= 7.23 a] are comparable with those of the compounds cited.