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By Norman H. March

The challenge of molecules interacting with steel surfaces has for a long time been famous to be of substantial technological in addition to basic value. hence within the former type, a considerable variety of vital man made reactions for commercial reasons utilize steel surfaces as catalysts. Or back, difficulties of corrosion of metals are of significant sensible value, akin to in nuclear-reactor expertise [see, for example, my past articles, in: Physics Bulletin, quantity 25, p. 582, Institute of Physics, united kingdom (1974); and in: Physics and Contemporqry wishes (Riazuddin, ed. ), Vol. 1, p. fifty three, Plenum Press, ny (1977)]. it really is as a result of importance to attempt to achieve a extra primary comprehend­ ing of the atomic, and finally the digital, techniques that ensue while a molecule is introduced into the proximity of a steel floor. the current quantity focuses ordinarily at the conception and ideas concerned; even if, it truly is meant for readers in chemistry, physics, and fabrics technology who're now not experts in idea yet however desire to examine extra approximately this really interdisciplinary zone of theoretical technological know-how. the purpose of the booklet is to provide the best way valence idea should be synthesized with the knowledge of metals that has been received over the past part century or so. whereas complex thought has from time to time been invaluable, is basically awarded in an in depth set of Appendixes.

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12) which is a slight enhancement over the Casimir-Polder free-space result of Sec. 1 • Physisorbed Diatoms with Well-Defined Cores 27 - (23fzc /41Tr 7)0' 1(0)0'2(0). In practice, the separation distance at which retardation effects appear would far exceed the molecular bond length. 2. Perpendicular Configuration When the molecule is perpendicular to the surface, let the atoms be at ZI and Z2. 14) Here F~(zdzI2) is an enhancement factor, decreasing monotonically from 8/3 at (zl/zd = 0 to 1 at (ZI/ZI2) = x.

5) describes a virtual excitation from the ground state Ila) to the excited state 1/" a ") in which the electron on one of the ada toms is transferred to the conduction band above the Fermi level. The state II' a) is formed when another electron in the band below the Fermi level is then transferred to the adatom, creating an electron-hole pair. The situation is similar for the case Eo> E r. 6) I where m) is a localized wave function centered at m, mz is the component of m perpendicular to the surface and mz = 0 for surface sites, N is the number of lattice atoms, a is the lattice constant, and k = (p, kz).

In principle, 1 is the total Coulomb energy of the system. This can be obtained as the sum of two terms: the Coulomb energy of the atoms without the surface present, and the correction due to the image potential. For instance, there is the interaction between one atom and the image of the other; however, due to spherical symmetry this interaction is identically zero. While the conclusion therefore is that the Coulomb energy of the new system with the surface coincides with that of the free H2 molecule, a more interesting situation arises when one considers K.

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