Download Atomic and Ion Collisions in Solids and at Surfaces: Theory, by Roger Smith PDF

By Roger Smith

This e-book is an advent to the applying of machine simulation and idea within the research of the interplay of full of life debris (1 ev to the MeV variety) with stable surfaces. The authors describe equipment which are appropriate either to difficult collisions among nuclear cores of atoms right down to smooth interactions, the place chemical results or long-range forces dominate. the variety of power purposes of the method is gigantic. In floor technological know-how, purposes comprise floor atomic constitution selection utilizing ion scattering spectroscopy or aspect research utilizing SIMS or different strategies that contain intensity profiling. commercial purposes contain optical or not easy coating deposition, ion implantation in semiconductor gadget manufacture or nanotechnology. The thoughts defined will facilitate learning plasma-sidewall interplay in fusion units. This publication may be of curiosity to graduate scholars and researchers, either educational and business, in floor technology, semiconductor engineering, thin-film deposition and particleSHsurface interactions in departments of physics, chemistry and electric engineering.

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Extra resources for Atomic and Ion Collisions in Solids and at Surfaces: Theory, Simulation and Applications

Sample text

Note, however, that the bcc and simple cubic lattices are unstable structures. The unit of distance is taken to be the distance between nearest neighbours. 4. 14) is minimised with respect to d. 6e. Here uo is the value of u when d = do. The bulk modulus B can also be estimated from the potential for an fee lattice (Ashcroft and Mermin, 1976) as The pair potential formulation therefore allows a direct comparison with experimental data for the solid noble gases. The agreement is reasonable but the theoretical bulk modulus is 20% larger than that which is observed.

The potentials defined below are all repulsive at small particle separation, r, and zero as r —• oo. We concentrate here on two types of potential, power law and screened Coulomb. Perhaps the simplest potential is the Coulomb potential 4ner r which is a special case of the more general power law potential V(r) = ^ . 65) The 'screened' Coulomb potentials considered in this section take the form W = E—• (2-66) The constants at and c\ for a number of screened Coulomb potentials are given in Chapter 3.

The appropriate solution of Schrodinger's equation for the electron gas is xpk = (I/J^L) exp(i& • r) with energy S(k) = h2k2/(2m) and momentum p = hk (Ashcroft and Mermin, 1976). The normalisation constant f^L2 is chosen so that the probability of finding an electron somewhere in the volume ^ L is unity. The wave number k of an electron in the level \pu is quantised so that the number of allowed k values per unit volume of k space is ^L/(87T 3 ). 2 The repulsive wall potential 45 will be approximately spherical.

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