Higher-Order<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Effects and Effects of Screening by Bound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>Electrons on the Electronic Stopping of Channeled Ions

Datz, S.; Campo, J. Gómez del; Dittner, P.F.; Miller, P.D.; Biggerstaff, J.A.

doi:10.1103/physrevlett.38.1145

Cited by 67 publications

(13 citation statements)

References 18 publications

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“…For this we have extended this formalism, which was given for K, L and M excitation by Kocbach [, to the N-shell. The interest for data like these lies in the comparison with SCA-theory and in the fact that this is one of the outermost core shells and thus contributes significantly to the energy loss especially in channeling experiments [12,13].…”

Section: Introductionmentioning

confidence: 98%

N-shell ionization of tungsten by proton impact

Tittel¹,

Bell²

1978

Z Physik A

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Section: Introductionmentioning

confidence: 98%

N-shell ionization of tungsten by proton impact

Tittel¹,

Bell²

1978

Z Physik A

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“…For heavy ions the energy-loss spectrum is known to be strongly affected by charge exchange. In order to avoid this complication, the focus of the present study is on experiments with charge-separated beams, in particular energy losses of ions in 'frozen charge states' [13,14]. A particularly attractive feature of such measurements is the option of analysing the extrapolated minimum energy loss, since it reflects trajectories with a relatively well-defined impact parameter to the atoms in the crystal.…”

Section: Introductionmentioning

confidence: 99%

“…In the following we shall focus on measurements of planar channeling in (111) Au [13] and axial channeling in [110] Si [14].…”

Section: Introductionmentioning

confidence: 99%

Impact-parameter-dependent stopping of swift ions

Sigmund

Schinner

2009

Eur. Phys. J. D

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Quantitative theory of the stopping of channeled ions needs impact-parameter-dependent electronic energy loss as input. In the previous paper, binary stopping theory has been expanded to provide such data primarily for the classical regime, i.e., for beam energies below 100 2 1 keV/u. The theory incorporates the Barkas-Andersen effect, charge-dependent projectile screening and pertinent atomic properties. A stringent test on the scheme is channeling measurements under frozen-charge conditions, where minimum energy losses have been measured. We have applied the scheme to the stopping of B, C, N, O and F ions in the (111) planar channel of Au, and of F, Mg, Si, S and Cl ions in the [110] axial channel of Si. The Si target has been characterized in terms of atomic charge distributions for the three principal shells. The Au target has been characterized by atomic charge distributions for all subshells except the 6s electrons which are described in terms of a homogeneous electron gas. Better than 10 pct agreement has been achieved without the use of adjustable parameters with experimental data for 2 MeV/u ions in Au and 3 MeV/u in Si for all measured charge states. We find that a description in terms of the impact-parameter dependence is essential in the analysis, in particular with regard to the influence of the charge state. The discussion emphasizes the fact that unlike in random motion, the stopping force follows a 2 1 relation quite closely.

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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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Higher-OrderZ1Effects and Effects of Screening by BoundKElectrons on the Electronic Stopping of Channeled Ions

Cited by 67 publications

References 18 publications

N-shell ionization of tungsten by proton impact

N-shell ionization of tungsten by proton impact

Impact-parameter-dependent stopping of swift ions

Electronic energy loss of channeled ions: The giant Barkas effect

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