Spin asymmetries in the electron-impact ionization of Ar(2p)

Bellm, Susan; Lower, Julian; Kampp, Marco; Whelan, Colm T.

doi:10.1088/0953-4075/39/22/018

Cited by 3 publications

(5 citation statements)

References 22 publications

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“…The experimental results and DF calculation were reported previously in Ref. [4]. Error bars on the experimental data-points are indeed large, however this reflects the extreme difficulty of this exper-Fig.…”

Section: Comparison Of Theory With Experimentssupporting

confidence: 59%

“…Experimental results and DF calculation are from Ref. [4]. Discrepancies between the calculations and experimental data are evident at θ 1 = 20 • and Given the small number of experimental counts, we show in Fig.…”

Section: Comparison Of Theory With Experimentsmentioning

confidence: 86%

“…This was the approach adopted in Ref. [4]. In order to better assess the origins of deviations from the Jones et al model [6] we observed in that study, we present here a second set of rDWBA model calculations where all three electrons see the neutral argon potential, generated using the density functional approach used in Ref.…”

Section: Theorymentioning

confidence: 99%

“…In an earlier publication [4] we presented experimental spinasymmetry data for the electron-impact-induced ionization of argon atoms by spin-polarized electrons and compared it to relativistic scattering calculations. The objective of that work was to better understand the origins of spin-asymmetries previously observed in the scattering of spin-polarized electrons from unpolarized closed-shell atomic targets by performing measurements and calculations under simplified scattering conditions.…”

Section: Introductionmentioning

confidence: 99%

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The effect of target fine-structure on the measured spin asymmetries for the electron-impact ionization of Ar(2p)

Bellm

Lower

Kampp³

et al. 2007

Journal of Electron Spectroscopy and Related Phenomena

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Section: Comparison Of Theory With Experimentssupporting

confidence: 59%

Section: Comparison Of Theory With Experimentsmentioning

confidence: 86%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of target fine-structure on the measured spin asymmetries for the electron-impact ionization of Ar(2p)

Bellm

Lower

Kampp³

et al. 2007

Journal of Electron Spectroscopy and Related Phenomena

Self Cite

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“…This suggests that the experiment may indeed describe a simpler scattering process. Comparison of the data with Relativistic Distorted Wave Born Approximation (rDWBA) calculations will appear in a future publication [24].…”

Section: Comparison Of Theory With Experimentsmentioning

confidence: 99%

Ionization of Atoms with Spin Polarized Electrons

Lower¹,

Bellm²,

Panajotović³

et al. 2006

AIP Conference Proceedings

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On the authors' and employers' webpages: There are no format restrictions; files prepared and/or formatted by AIP or its vendors (e.g., the PDF, PostScript, or HTML article files published in the online journals and proceedings) may be used for this purpose. If a fee is charged for any use, AIP permission must be obtained. An appropriate copyright notice must be included along with the full citation for the published paper and a Web link to AIP's official online version of the abstract. Abstract. The most detailed insight into the process of electron impact-induced ionization of atomic species is provided by measurements in which both kinematical and quantum mechanical variables are determined. Here we describe recent (e,2e) experimental and theoretical studies involving the ionization of xenon and argon by spin-polarized electrons in which the finestructure levels of the ion are energetically resolved. Such investigations shed light on the mechanisms driving the ionization reaction and the role of exchange and relativistic processes.

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Investigating many-electron exchange effects in electron–heavy-atom scattering

et al. 2008

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In a recent publication we presented measurements and distorted-wave Born approximation ͑DWBA͒ calculations for spin asymmetries resulting from the scattering of 148 eV spin-polarized electrons from groundstate xenon atoms. While achieving reasonably good agreement between theory and experiment by accounting for many-body exchange effects through a local exchange potential, sizable discrepancies remained in some cases. It was proposed that a more sophisticated treatment of exchange might be the key to obtaining better agreement. Here we present high-precision experimental results at a lower projectile-electron energy of 112 eV. Due to improvements made to our spectrometer, these data are of significantly-improved statistical accuracy over those obtained previously. They are compared to DWBA calculations, within whose framework electron exchange is treated in three different ways. In the first, only exchange between the projectile electron and ejected target electron is considered and that between the continuum-and bound-electrons is ignored. In the second, exchange between the continuum-and bound-electrons is treated through a local approximation. Finally, exchange is included through a Hartree-Fock ͑HF͒ calculation of wave functions for both bound-and continuum-electrons. While this more sophisticated treatment of exchange narrows the gap between experiment and theory, the results suggest improvements in other aspects of the problem may be warranted.

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Spin asymmetries in the electron-impact ionization of Ar(2p)

Cited by 3 publications

References 22 publications

The effect of target fine-structure on the measured spin asymmetries for the electron-impact ionization of Ar(2p)

The effect of target fine-structure on the measured spin asymmetries for the electron-impact ionization of Ar(2p)

Ionization of Atoms with Spin Polarized Electrons

Investigating many-electron exchange effects in electron–heavy-atom scattering

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