Electron impact excitation of rare gases: differential cross sections and angular correlation parameters for neon, argon, krypton and xenon

Bartschat, Klaus; Madison, Don H.

doi:10.1088/0022-3700/20/21/029

Cited by 122 publications

(102 citation statements)

References 40 publications

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“…In their model, the spin dependence results from an interplay of exchange between the projectile and ejected target electron, angular-momentum coupling and the impactinduced orientation of the residual ion. The model predicts zero spin asymmetries in the limit of negligible exchange, and in analogy to the "Fine-structure Effect" in excitation [10,11], zero spin asymmetry for the case where the individual finestructure transitions are energetically unresolved. Subsequent measurements on xenon [12,13] and later, more sophisticated calculations [14,15], while confirming a strong spin-dependence in the ionization cross sections as originally predicted, have revealed additional and significant contributions from many-body exchange effects which tend to mask the signatures for a "pure" fine-structure effect.…”

Section: Fine Structure Effectmentioning

confidence: 85%

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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Section: Fine Structure Effectmentioning

confidence: 85%

Ionization of Atoms with Spin Polarized Electrons

Lower¹,

Bellm²,

Panajotović³

et al. 2006

AIP Conference Proceedings

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“…Previous measurements cover only a small scattering regime corresponding primarily to large impact parameters. P3 data have been obtained at an impact energy of 80 eV in Ne [21] which is the only theoretical calculation available at this energy. The agreement between measured data and theoretical prediction is less satisfactory than the level of agreement between experiment and theory for the linear coherence parameters P~ and P2 at the same energy [11 ].…”

Section: Ii1 Results and Discussionmentioning

confidence: 99%

Measurements of circular polarization correlations following excitation of Ar and Kr by electron impact

Zheng

Becker

1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. We report measurements of the circular polarization correlation parameter P3 for the excitation of the 4s'[1/2]j= I state in Ar by 40 eV electrons and for the excitation of the Kr 5 s [3/2]j = ~ state by 30 eV electrons at electron scattering angles up to 50 °. The measured Ar data are compared to predictions of a distorted wave Born approximation (DWBA). The agreement is in general not very good with theory predicting 14 values considerably larger than the measured values in the regime of small scattering angles. In Kr, where the measured data are compared to theoretical predictions from a DW-BA, a first-order many-body theory (FOMBT) and a relativistic distorted wave theory (RDW), the level of agreement between experiment and theory is somewhat better. The measured P3 parameters in conjunction with the previously measured linear coherence parameters P~ und P2 under the same scattering conditions yield the total polarization P+ which is a measure for the level of cohertot ence in the excitation process. In both cases studied here, we found values of eliminate /~+ that were consistent tot with a fully coherent excitation process.

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“…A semirelativistic first-order DW approximation (DWBA) was introduced by Madison and Shelton (1973) and later modified by Bartschat and Madison (1987) to treat electron collisions with heavy noble gases and also with mercury. Other variants include the first-order many-body theory (FOMBT) of the Los Alamos group Machado, Leal and Csanak (1982), the semirelativistic version developed and described by Dasgupta, Blaha and Giuliani (2000), and the relativistic distorted-wave (RDW) method of the Toronto group Zuo, McEachran and Stauffer (1991).…”

Section: The Distorted-wave (Dw) Methodsmentioning

confidence: 99%

Electron Scattering by Atoms, Ions, and Molecules

Bartschat

Burke

Crowe

2009

Digital Encyclopedia of Applied Physics

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A summary is given of many important advances in the scattering of electrons from atoms, ions, and molecules up to the summer of 2008. Recently introduced experimental techniques, which lead to more efficient studies, are discussed together with a wide range of increasingly sophisticated theoretical methods. Examples of experimental and theoretical data are presented and compared where appropriate.

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Electron impact excitation of rare gases: differential cross sections and angular correlation parameters for neon, argon, krypton and xenon

Cited by 122 publications

References 40 publications

Ionization of Atoms with Spin Polarized Electrons

Ionization of Atoms with Spin Polarized Electrons

Measurements of circular polarization correlations following excitation of Ar and Kr by electron impact

Electron Scattering by Atoms, Ions, and Molecules

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