A modified lattice potential model of electronically mediated sputtering

Watson, C. C.; Tombrello, T. A.

doi:10.1080/00337578508222510

Cited by 105 publications

(16 citation statements)

References 37 publications

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“…A variation based on the core-penumbra model assumes a r Ϫ͑2Ϫ␥͒ dependence, with ␥ small. 17 Waligorski, Hamm, and Katz 18 proposed a semiempirical model in which the decay is slower for small r out to a certain radius where (r) is well described by a r Ϫ2 dependence. Then using (r)ϰ(dE/dx)/r 2 , one finds r 0 2 ϰ(dE/dx).…”

Section: Hit Modelmentioning

confidence: 99%

“…In the track structure models, the average energy density is approximated by a continuous and radially symmetric distribution of the energy deposited around the ion path. [15][16][17][18] The radius of the cylinder around the primary ion trajectory within which energy is transferred ͑ultratrack radius, R u ͒ is determined by the maximum range of the ␦ electrons perpendicular to the track. R u increases with ion velocity, 15 hence for the same dE/dx the deposited energy density in a single ion track is higher at low ion velocities than at high velocities.…”

Section: Introductionmentioning

confidence: 99%

“…Here experiments are performed in which the velocity is constant, so the track dimensions are fixed. A number of models have been developed for estimating the mean deposited energy density (r) at a radial distance r from the center of the track [15][16][17][18] and these will be examined here.…”

Section: Introductionmentioning

confidence: 99%

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Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

et al. 1996

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Thin poly͑phenylene sulphide͒ foils were bombarded with fast atomic ions ͑ 4 He, 12 C, 16 O, 32 S, 79 Br, 127 I͒ in the energy range between 2.5 to 78 MeV. In order to maintain the same ion track size for all impacting ions, their initial velocity was kept constant at 1.1 cm/ns. Under these conditions the deposited energy density in a single ion track changes as a result of the varying stopping power (dE/dx) of the projectiles in the material. Fourier transform infrared spectroscopy and UV-visible spectroscopy were used to characterize the irradiated targets. Damage cross sections ͑ ͒ for different chemical bonds, such as C-S and ring C-C bonds, are extracted from the IR data. For all analyzed IR bands, the values of scale roughly with the square of dE/dx ͑energy density in a single ion track͒. The absorption of the irradiated samples in the visible and UV region increases as a function of fluence. The rate of increase of absorption at a particular wavelength scales also as (dE/dx) n with nϷ2. The observed nonlinear dependence of the damage cross sections on the deposited energy density is considered in the light of two models: a statistical model based on the fluctuations of the energy deposited by the primary ions ͑hit theory͒ and an activation ͑thermal spike͒ model. It is found that the damage cross section is not determined directly by the initial deposited energy density distribution. The best agreement between experiment and theory is obtained when transport of the deposited energy occurs.

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Section: Hit Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

et al. 1996

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“…Such a dependence is obtained from theory employing the continuous slowing down approximation [4,6] for the secondary electrons, Monte Carlo simulations [5][6][7], as well as experiments performed in gases [8,9]. Several energy-transport mechanisms [10,11] have been advanced to describe the subsequent energy propagation and dissipation. However, no direct experimental determination of the initial or evolved energy distribution exists for targets in the condensed phase.…”

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confidence: 99%

Measurement of MeV Ion Track Structure in an Organic Solid

et al. 1996

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“…Other approaches are based (i) on the statistical deposition of the energy in electronic processes in order to account for some results in the "low velocity" regime [34], (ii) the role of target inner shell electron excitation which creates strong ionisation and leads to some damage creation [35], (iii) excitor interaction [36], (iv) the shock-wave model [37], (v) the core plasma model [38], (vi) a modified lattice potential [39].…”

Section: A Few Words About Possible Mechanisms By Which Defect Generamentioning

confidence: 99%

Materials Modifications with Cluster Beams: Bulk and Surface Modification

Dunlop

1999

Acta Phys. Pol. A

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It is now well accepted that electronic excitation and ionization arising from the slowing down of swift heavy ions can lead to structural modifications in some metallic targets as it has been known for a long time in insulators. A rapid overview of some results obtained after GeV monoatomic heavy ion irradiations will be given. It will then be shown that new specific effects take place during irradiations with cluster ions. The projectiles used are energetic cluster beams: 10 to 40 MeV Au4 or C60 ions. The rates of linear energy deposition in electronic excitation are close for GeV monoatomic and for 10 MeV cluster ions, but the cluster ions have characteristic velocities which are one order of magnitude smaller than those of monoatomic ions. This leads to a strong spatial localization of the deposited energy during the slowing down process. The density of deposited energy can then reach values as high as a few 100 eV/atom. This very high density of energy deposited in the electronic system of the targets can lead to spectacular structural modifications: generation in the vicinity of the ion trajectories of isolated or agglomerated point defects, new crystalline phases, amorphized regions... After an overview of such damage induced in bulk metals, semiconductors, and insulators, we will discuss surface damage, consisting in the formation of bumps, craters, "lava-flows" on the target surface.

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A modified lattice potential model of electronically mediated sputtering

Cited by 105 publications

References 37 publications

Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

Measurement of MeV Ion Track Structure in an Organic Solid

Materials Modifications with Cluster Beams: Bulk and Surface Modification

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