Experimental energy loss of slow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup><

Valdés, Joaquín; Parra, Carolina; Diaz-Valdes, J. F.; Denton, Cristian D.; Agurto, C.; Ortega, Francisco; Arista, N. R.; Vargas, P.

doi:10.1103/physreva.68.064901

Cited by 27 publications

(17 citation statements)

References 18 publications

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“…Isotope effects are absent within experimental uncertainties. Additionally, significant vicinage effects [33] on " can be ruled out in the present investigation. Our results are in very good agreement with earlier measurements [27] (open squares) and at the same time extend the range, where " / v is observed, by a factor of 2 towards lower energies.…”

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confidence: 81%

Electronic Excitations of Slow Ions in a Free Electron Gas Metal: Evidence for Charge Exchange Effects

et al. 2011

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Electronic energy loss of light ions transmitted through nanometer films of Al has been studied at very low ion velocities. For hydrogen, the electronic stopping power S is found to be perfectly proportional to velocity, as expected for a free electron gas. For He, the same is anticipated, but S shows a transition between two distinct regimes, in both of which S is velocity proportional-however, with remarkably different slopes. This finding can be explained as a consequence of charge exchange in close encounters between He and Al atoms, which represents an additional energy loss channel.

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confidence: 81%

Electronic Excitations of Slow Ions in a Free Electron Gas Metal: Evidence for Charge Exchange Effects

et al. 2011

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“…However, we have recently developed an approach to describe slowing of ions through solids under conditions of strongly varying electron densities. We have applied it to the case of proton scattering through crystals [19] and in scattering on the Ag(110) surface [20].…”

Section: Introductionmentioning

confidence: 99%

Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence

et al. 2011

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A joint experimental and theoretical study of energy loss is presented for 1-to-4-keV fluorine negative ions in grazing scattering on a missing-row reconstructed Au(110) surface. Measurements of energy losses for various azimuthal orientations of the crystal have been performed by means of a time-of-flight method with a pulsed beam. The dependence of the fraction of surviving negative ions on azimuthal angles, was determined. Our energy-loss data are discussed in light of trajectory and stopping-power calculations, where the explicit inclusion of the nonuniform electron density at the surface provides good agreement with the experimental data. The simulation allows us to delineate various trajectory classes that correspond to different contributions in the energy-loss spectra for various azimuthal orientations of the surface.

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“…The agreement of these theoretical values with the before-mentioned [6][7][8] motivating data is good. More recent data [31,32] obtained by slow H 2 + under channeling conditions in a gold target also show reduced stopping powers, i.e., a negative vicinage effect. The agreement with different data sets supports our detailed analyses given above in Eqs.…”

Section: Theory and Resultsmentioning

confidence: 89%

“…Using realistic parameters, a good agreement with two different experimental data sets, obtained by slow H 2 + and C 2 + intruders in a carbon target, is established. The analytical expressions derived in this work could be useful for other (for instance, for N 2 + or O 2 + intruders) homonucleardimer-metallic-target cases, in a computer simulation [31] with slow dimers, and for orientation-dependent [33] friction coefficients of molecules on surfaces.…”

Section: Discussionmentioning

confidence: 99%

Orientation-dependent stopping power of a degenerate electron gas for slow homonuclear dimers

Nágy

Aldazabal

2010

Phys. Rev. A

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We present a theoretical study on the orientation-dependent retarding force experienced by slow homonuclear dimers moving at arbitrary alignment with the direction of their flight in a three-dimensional degenerate electron gas of metallic densities. The analytical results are derived within the approximate framework of Brueckner for elastic scattering of an electron by a system of two auxiliary potentials of short range. The influence of the screened field of a single constituent of the slowly moving composite projectile on the scattering electron is modeled by an effective phase shift parameter η in the short-range potential in order to characterize the real-constituent system coupling due to displacement. The orientation-dependent closed expressions reveal the dependence of observables on the classical geometry and quantum dynamics. The interplay of wave-interference and multiple scattering in the orientation-dependent friction is analyzed for realistic sets of the input parameters. Comparison with experimental data is made and good agreement is found.

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Experimental energy loss of slowH+andH2+<

Cited by 27 publications

References 18 publications

Electronic Excitations of Slow Ions in a Free Electron Gas Metal: Evidence for Charge Exchange Effects

Electronic Excitations of Slow Ions in a Free Electron Gas Metal: Evidence for Charge Exchange Effects

Energy loss of keV fluorine ions scattered off a missing-row reconstructed Au(110) surface under grazing incidence

Orientation-dependent stopping power of a degenerate electron gas for slow homonuclear dimers

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