Charge state dependence of channeled ion energy loss

Golovchenko, Jene Andrew; Goland, A.N.; Rosner, J.; Thorn, C.; Wegner, H. E.; Knudsen, H.; Moak, C. D.

doi:10.1103/physrevb.23.957

Cited by 60 publications

(24 citation statements)

References 29 publications

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“…Ions with velocity v proceed in the solid having, at least temporarily, bound electrons [7][8][9][10][11], even if v > Ζ m, and the distribution of charge is not completely predicted. Also, the contribution of higher order terms in the Born series [12, 13] creates a problem of completeness and validity of the starting point for simplified calculations.…”

Section: Introductionmentioning

confidence: 99%

Effective Ion Charge

Moneta

1996

Acta Phys. Pol. A

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The impact parameter dependent energy transfer and random stopping power for ions carrying electrons were determined within the first-order Born approximation. The ion and atom were described by many-electron ground states. The excitations and ionizations of both collision partners were taken into account, but exchange of electrons was neglected. With the Bethe sum rule and closure relation, the random stopping was shown to have the Bethe form. For the Moliere form factors the anaJytical results were obtained. The effective charge was discussed in the random and channelling conditions. Comparison with some previous calculations was carried out.

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Section: Introductionmentioning

confidence: 99%

Effective Ion Charge

Moneta

1996

Acta Phys. Pol. A

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“…low ion velocity v. The basic papers in this field [1,2] were related to the analysis of the stopping and straggling of an atomic nucleus as a.n ion and thus neglecting the effect of its electronic configuration. The results of calculation for structured projectiles at high [3][4][5][6] and low [7][8][9] ion velocities, and also experimental results for low velocity heavy ions [10] were published. To the author's knowledge, neither theoretical nor experimental data.…”

Section: Introductionmentioning

confidence: 99%

Energy Loss of Excited Slow Ions in Electron Gas

Moneta

1999

Acta Phys. Pol. A

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The electronic energy loss and the straggling of the energy loss of the degenerate electron gas for excited H*-, He*-, He**-, and Lit-like ions were calculated. The results were compared with the corresponding characteristics for ions kept in the ground state. The linear response theory was used. The ion was described by the Hartree-Fock-Slater formalism and the medium by the dielectric function. The stopping and straggling effective charges Ze f for the energy loss were analysed and they were found to differ from each other and to depend on the one-electron radius rs, on the ion atomic number and on the number of electrons Ni carried by the ion.

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“…Recently, after some attempts [10,11], the channeling technique was proven to be a powerful tool to extract the Barkas contribution to the valence stopping power from experimental data. Indeed, it has been shown [12] that for He and Li ions traveling in axial channels in Si, the Barkas effect is responsible for a sizable fraction of the total stopping power.…”

Section: Introductionmentioning

confidence: 99%

Electronic energy loss of channeled ions: The giant Barkas effect

et al. 2004

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In this work we have measured the electronic energy loss of 9 Be and 11 B ions for the ͗100͘ and ͗110͘ directions in Si as a function of the incident ion energy. The channeling measurements cover a wide energy range between 100 keV/ amu and 1 MeV/ amu. The Rutherford backscattering technique has been employed in the present experiments. An overall compilation of channeling energy loss values for several ions, including those for He, Li, and O measured previously, provides a clear picture of the Barkas contribution to the stopping power due to valence electrons in the present energy regime. A maximum of the relative contribution occurs for Be ions around 250 keV/ amu while a saturation effect is observed for heavier ions. These results are interpreted in terms of a self-consistent nonlinear calculation based on the transport cross-section approach together with the unitary convolution approximation model, which describe the present data reasonably well at high projectile energies.

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Charge state dependence of channeled ion energy loss

Cited by 60 publications

References 29 publications

Effective Ion Charge

Effective Ion Charge

Energy Loss of Excited Slow Ions in Electron Gas

Electronic energy loss of channeled ions: The giant Barkas effect

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