Experimental study of relative level populations in beam-foil-excited Ar VIII and Kr VIII

Bashkin, S.; Oona, H.; Veje, E.

doi:10.1103/physreva.25.417

Cited by 38 publications

(21 citation statements)

References 31 publications

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“…We propose observable fluorescence from Ar 7+ ions penetrating through a suspended graphene sheet 3 by comparing our current results with the previous experiment. 10 …”

Section: Introductionmentioning

confidence: 99%

Electronic excitation in anAr7+ion traversing a graphene sheet: Molecular dynamics simulations

Miyamoto

Zhang

2008

Phys. Rev. B

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We studied the interaction between an Ar 7+ ion and a graphene sheet by combining real-time propagation of electron wave functions with molecular dynamics simulations. Our calculation supports the fluorescence from Ar 7+ ions penetrating the carbon foil ͓S. Bashkin et al., Phys. Rev. A 25, 417 ͑1982͔͒, and it suggests that this fluorescence also occurs even when the thickness of the target is only the monatomic layer and when the incident kinetic energy corresponds to 500 keV. Monitoring the fluorescence is a useful way to detect graphene sheets even with monatomic thickness.

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“…We propose observable fluorescence from Ar 7+ ions penetrating through a suspended graphene sheet 3 by comparing our current results with the previous experiment. 10 …”

Section: Introductionmentioning

confidence: 99%

Electronic excitation in anAr7+ion traversing a graphene sheet: Molecular dynamics simulations

Miyamoto

Zhang

2008

Phys. Rev. B

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“…As a consequence one obtains a population in the excited terms which drastically reduces with increasing principal quantum number. In recent beam-foil experiments, however, in Li-like CIV, NV, OVI, FVII [11] and Na-like ArVIII [12] at energies from 2.5 to 9MeV and at 2MeV, respectively, a preferential population of Rydberg levels is observed. These results are interpreted by a resonance transfer from the valence band of the carbon foil material to these levels which do have approximately the correct energy position.…”

Section: Selective Excitation In Beam-foil Interactionmentioning

confidence: 88%

“…First of all we obtain neutralization probabilities P,(oo) up to 53% even at such short interaction times so that the resonant electron transfer indeed Fig. 8 of [12] plays the important role in the formation of Ar VIIIRydberg-levels. Second we note that the relative dependence on the principal quantum number n of P~(oo) and the data show a very similar structure, although P~(oo) peaks at a somewhat lower n than the measured populations.…”

Section: Selective Excitation In Beam-foil Interactionmentioning

confidence: 94%

“…In order to discuss these beam-foil data in terms of the electron transfer model, we select the ArVIIIexperiment and show in Fig. 8 the energy level dia- The ns-and ng-populations have also been measured by [12], but are omitted here because of reasons of clearness gram for the ion and the carbon surface, and the populations as measured by Bashkin and coworkers [12]. For an estimation of the neutralization rate we first calculate with (1) for each ArVIII-level Yc from the corresponding level binding energies [27] and the workfunction of carbon.…”

Section: Selective Excitation In Beam-foil Interactionmentioning

confidence: 99%

“…Section IV is devoted to the observation of excited states of alkali atoms and a discussion of the consequences for the model. An interpretation with the model of recent beam-foil work giving evidence for a preferential population of Rydberg levels in highly ionized atoms [11,12] is outlined in Sect. V. In Sect.…”

Section: Introductionmentioning

confidence: 99%

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Band structure effects in high energy ion beam surface interaction at grazing incidence

et al. 1983

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The analysis of charge state distributions after the interaction of fast Li-and N-ions with a surface at grazing incidence at energies between 50 and 350keV yields for Li a strongly suppressed and for N an enhanced fraction of neutrals in comparison to the beam-foil interaction. These findings are supported by corresponding alkali-spectra which are dominated by lines from transitions in singly ionized atoms. The experiments are consistently interpreted in terms of a two step model: (1) collisional excitation in the close vicinity of the surface and (2) modification of this population by resonant electron transfer from (to) non localized states in the conduction (valence) band to (from) the ion. The model is also applied to interpret recent beam-foil experiments where preferential populations of Rydberg levels in highly ionized atoms were found.

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Alignment of high rydberg states in hydrogen

Berry

Dehaes

Neek

et al. 1984

Forward Electron Ejection in Ion Collisions

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Wa have measured the light yields and polarizations of the light emitted from several Balmer transitions in atomic hydrogen following beam foil excitation of protons at energies of 50 to 150 kev. The polarizations have been measured as a function of distance downbeam from the exciter foil for several transitions. The measurements indicate a very strong initial alignment which is then perturbed by surface fields out to several mm from the surface.

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Experimental study of relative level populations in beam-foil-excited Ar VIII and Kr VIII

Cited by 38 publications

References 31 publications

Electronic excitation in anAr7+ion traversing a graphene sheet: Molecular dynamics simulations

Electronic excitation in anAr7+ion traversing a graphene sheet: Molecular dynamics simulations

Band structure effects in high energy ion beam surface interaction at grazing incidence

Alignment of high rydberg states in hydrogen

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