Ion reflection from a single crystal

Yurasova, V. E.; Shulga, V. I.; Karpuzov, D.S.

doi:10.1139/p68-094

Cited by 100 publications

(12 citation statements)

References 2 publications

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“…At small scattering angles the high energy peak disappears, suggesting that in that case multiple collision processes cannot occur. This is in agreement with reports of Kivilis et al [3], Yurasova et al [2], Maskova et al [4], Heiland et al [5] and can easily be understood from the fact that at small angles of incidence and for low primary energy of the incoming ions not all possible impact parameters are permitted (surface atomic screening [6]. Analogous arguments explain the existence of a maximum scattering angle above which no scattering can occur.…”

Section: Introductionsupporting

confidence: 91%

“…The low energy peak can be identified with a mainly binary collision process, the other one with a multiple collision process. The energies corresponding to these peaks depend on the potential function between the collision partners, the angle of incidence, the scattering angle, the mass ratio and the distance between the surface atoms in the plane of incidence (in the case of multiple scattering) [ 1,2]. When at fixed angle of incidence, primary energy and mass ratio the relative energy of the peaks is plotted as a function of the scattering angle, the so-called multiple scattering loops are obtained ( fig.…”

Section: Introductionmentioning

confidence: 99%

“…Computer calculations have pointed out that Bmin and emax depend on the assumed potential function for the interaction between a noble gas particle and the atoms in the metal surface [2,3]. The best fit of the experimental results and a computer model is obtained by varying the parameters of the potential function between noble gas particles and surface atoms [ 171; mostly the Born-Mayer potential function has been used: V(r) = A e-br.…”

Section: Introductionmentioning

confidence: 99%

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Multiple scattering and neutralization aspects of low energy noble gas ions incident on a Cu (110) crystal

Wit¹,

Schootbrugge²,

Fluit³

1975

Surface Science

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Experiments have been done with 1 keV Ne+ ions bombarding a Cu(ll0) single crystal in a (Ill) plane. From the measured energy spectra of the scattered ions the minimum and maximum scattering angles for multiple scattering on the surface are determ~ed. These rn~~urn and max~um scattering angles were also calculated using a computer model. The parameters for an interatomic potential function between ion and metal atom are determined by comparison of the experimental and calculated scattering angles. A neutralization model for an energetic ion at an atomic surface is given, The reliability of this model is tested by comparison of the results of computer calculations and the measured peak intensity distributions as a function of the scattering angle.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiple scattering and neutralization aspects of low energy noble gas ions incident on a Cu (110) crystal

Wit¹,

Schootbrugge²,

Fluit³

1975

Surface Science

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“…Experimental and theoretical work has been accompanied by a significant interest in digital computer simulation of the interaction processes, a study which is particularly suited to computation because of the many particle nature of the interactions. Various groups have studied (1) the motion of energetic ions slowing down by collision in a randomized or symmetric crystalline atomic array;(') (2) the motion of the atoms of an array when subjected to fast particle irradiation;@) (3) the ejection of atoms from a solid surface by ion irradiation (sputtering) which results from the motion of the atoms generated by the ions;@) (4) the scattering of low energy ions back from a solid surface; (4) and ( 5 ) the forward scattering and penetration of low energy ions into an irradiated solid. @) Preliminary work in the final category has been reported by the present authors who investigated the trajectories of low energy inert gas ions incident upon a planar array of four tungsten atoms simulating a representative area of the (100) surface of tungsten and computed the probability of ion penetration through the array.…”

Section: Introductionmentioning

confidence: 99%

Computer simulation of the penetration and backscattering of low energy krypton ions into single crystal tungsten

Smith

Carter

1972

Radiation Effects

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The trajectories of Kr ions in the energy range 50 eV to 5 keV incident on the (100) and (1 10) surfaces of W have been followed using digital computational techniques, in which the interaction was treated as a multiparticle process rather than a sequence of binary collisions. At the higher energies (>2 keV), the latter process was found to be a good description also of the multiparticle event but at lower energies, many atoms were involved simultaneously in the ion scattering process. Probabilities of ion penetration into the surfaces were derived and compared with experimental data of Kornelsen and Sinha and penetration probability-energy functions shown to be similar. For the (100) surface penetration was prohibited below an ion energy of-400 eV and angular and energy distributions of backscattered particles in this energy range were determined. Angular analysis showed a pattern illustrative of surface atomic symmetry but the energy distribution shows a sharply defined probability of backscattering in narrow energy range which lies between the maximum recoil energy in a binary collision and recoil from an infinitely hard surface. This indicates that, as energy decreases, the multiple collision process can be approximately characterised as a 'soft' surface of effective mass greater than the target atom mass. Because of the sharply defined energy of recoil and a quite well defined narrow cone of backscattering, these results suggest a method of producing quite mono-energetic neutral atomic beams by recoil of ions fromsurfaces, since neutralization is usually highly efficient at low ion energies. The energy of ions recoiling in a collision on an axis of symmetry between surface atoms is compared with the theoretical non-binary scattering model of Andersen and Sigmund.

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“…a = hEo [ln{C/AEo} -I] (10) Integration of the scattering equations following substitution of the approximate potential yields (5) …”

Section: Such Thatmentioning

confidence: 99%

A theoretical treatment of low energy ion back-scattering from a row of gold atoms

1970

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A theoretical study of the scattering of an energetic He ion from a (110) row of gold atoms, to which it is incident normally, has been made. Single collisions of the ion with one gold atom or a succession of two collisions with adjacent gold atoms were investigated, using aBom-Mayer potential to define the interaction and approximate analytical expressions for the scattering equations for this potential form. The predicted trimodel dependence of the energy of the backscattered ion as a function of impact Parameter on a gold atom is shown to agree well with computer based calculations of the exact ion trajectories.

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Ion reflection from a single crystal

Cited by 100 publications

References 2 publications

Multiple scattering and neutralization aspects of low energy noble gas ions incident on a Cu (110) crystal

Multiple scattering and neutralization aspects of low energy noble gas ions incident on a Cu (110) crystal

Computer simulation of the penetration and backscattering of low energy krypton ions into single crystal tungsten

A theoretical treatment of low energy ion back-scattering from a row of gold atoms

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