By Wolfgang Eckstein
In this booklet the writer discusses the research of ion bombardment of solids via desktop simulation, with the purpose of demonstrating the usefulness of this method of the matter of interactions of ions with solids. a few of the chapters current the elemental physics in the back of the simulation courses, their constitution and lots of functions to diversified issues. the 2 major streams, the binary collision version and the classical dynamics version, are mentioned, as are interplay potentials and digital power losses. the most issues investigated are backscattering, sputtering and implantation for incident atomic debris with energies from the eV to the MeV diversity. an in depth review of the literature is given, making this ebook of curiosity to the energetic reseacher besides to scholars getting into the field.
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3), the curves for the distance of closest approach look quite different, especially at low € values, see Fig. 8b. The exact trajectories determined by solving Newton's equations illustrate the different behaviour originating from purely repulsive potentials and those potentials with an attractive part. 9a shows trajectories for a series of impact parameters for application of the Moliere potential to a Si-Si collision at 10 eV. The different trajectories clearly show the shadow cone behind the target atom, a region not accessible to the projectile.
In the Thomas-Fermi model, xy = 1. 5) and Lindhard et al. 8] potential of the different atoms. Robinson's proposed choice for the screening length will become clearer when the Born-Mayer potential is discussed in the next section. 9], where the screening function ~ has only one exponential term. This potential is too weak for larger separations r. 10] as an analytic approximation to the Thomas-Fermi potential. 1. The exponential terms in the Moliere potential have the property that the second and third exponentials are powers of the first exponential.
9a,b. Trajectories of 10 eV Si projectiles and Si recoils for the same elapsed time, varying the impact parameter p. 3) Analytical integration of the scattering integrals is possible in the form of elementary functions for the hard-sphere potential and some power potentials, V(r) ex: rn, with n = +2,0, -1, -2. 1]. For the purposes of this book, power potentials with n = -2 and -1 are sometimes valuable for qualitative investigations. 16]. He called the procedure "Magic" or the "magic formula". 10 it can immediately be written down that 22 ~ --- P1 I I Fig.