Electron impact ionization of ground-state and metastable Li<sup>+</sup>ions

Borovik, A.; Rausch, J; Schippers, S.; Müller, A.; Fursa, Dmitry V.; Bray, Igor

doi:10.1088/1742-6596/194/6/062002

Cited by 2 publications

(6 citation statements)

References 2 publications

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“…These data complete the picture for the He-like isoelectronic sequence in the region of low atomic numbers Z. All absolute cross-section measurements were carried out using the animated crossed-beams technique and the data reduction procedures as described in detail previously [5,15]. All experimental cross sections for electron impact ionization of He-like Li + , B 3+ , C 4+ , N 5+ , and O 6+ ions are shown in Fig.…”

Section: Methodsmentioning

confidence: 85%

“…Only for experiments with Li + ions pure groundlevel beams can be readily produced. Results have been published for Li + ions in the 1 1 S ground level and for Li + ion beams containing a mix of ions in the 1 1 S ground and metastable 2 3 S states [15]. Absolute total single-ionization cross sections were also measured for B 3+ [16] and N 5+ [17] ions.…”

Section: Methodsmentioning

confidence: 99%

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Spin asymmetry in electron-impact ionization

et al. 2019

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We investigate electron-impact single ionization of He-like ions of charge state q = 0,. .. , 6 in the initial ground (1 1 S) and metastable (2 3 S) states. Good agreement between theory and experiment is established for the total cross sections, and then the scaling behavior with q is considered as a function of the ratio u = Ei/EI ≤ 10 of the incident electron energy Ei and the ionization threshold EI. While the expected E 2 I scaling of the cross sections is confirmed, we also find that at each scaled energy u the spin asymmetry (for the 2 3 S state) converges rapidly to a non-zero constant with increasing q. This indicates that, despite EI increasing with q 2 , exchange effects remain undiminished on the broad scaled-energy range considered. We suggest that this physical behavior is more universal than just for the He-like ions.

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Section: Methodsmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Spin asymmetry in electron-impact ionization

et al. 2019

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“…Indeed, few-electron ionic beams are typically delivered in the ground state and additional long-lived, metastable components. This is a general feature not only encountered in TANDEM accelerators [51,52], but also in storage rings [53,54], as well as other lower energy highly charged ion sources [35], even though the production mechanisms can be quite different depending on the type of ion source. Clearly, a desirable feature would be to have a variable and controllable amount of metastable beam.…”

Section: Production Of Metastable Statesmentioning

confidence: 94%

“…has been successfully used in high resolution projectile electron spectroscopy investigations, as for example in single [23][24][25] and double [26] electron transfer, excitation [27], transfer-excitation [14,[28][29][30][31], the production of triply-excited states [32] and superelastic scattering [33,34]. In addition, long-lived 1s2s 3 S states, have also been used in a variety of other atomic physics investigations including the study of electron impact ionization [35,36], tokamak high energy charge-exchange [37] and edge impurities [38], electron capture and excitation [39], slow collisions of quasi symmetric heavy systems [40], beam-two-foil spectroscopy [41] and even two-electron quantum entanglement [42].…”

Section: Introductionmentioning

confidence: 99%

“…The measurement of relative Auger electron yields from doubly excited Li-like states formed in collisions of mixed-state He-like ions with H 2 targets [55,57,60-62]. (6) The normalization to model calculations[35,[73][74][75][76], where measured cross sections are normalized to theory, as for example, in the normalization of electron impact ionization measurements to convergent close coupling calculations[35].…”

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confidence: 99%

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Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

Benis¹,

Madesis²,

Laoutaris³

et al. 2018

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The use of mixed-state ionic beams in collision dynamics investigations is examined. Using high resolution Auger projectile spectroscopy involving He-like ($1s^2\thinspace^1\!S, 1s2s\thinspace^{3,1}\!S$) mixed-state beams, the spectrum contributions of the $1s2s\thinspace^3\!S$ metastable beam component is effectively separated and clearly identified. This is performed with a technique that exploits two independent spectrum measurements under the same collision conditions, but with ions having quite different metastable fractions, judiciously selected by varying the ion beam charge-stripping conditions. Details of the technique are presented together with characteristic examples. In collisions of 4 MeV B$^{3+}$ with H$_2$ targets, the Auger electron spectrum of the separated $1s2s\thinspace^{3}S$ boron beam component allows for a detailed analysis of the formation of the $1s2s(^3\!S)nl \thinspace^2\!L$ states by direct $nl$ transfer. In addition, the production of hollow $2s2p\thinspace^{1,3}\!P$ doubly- and $2s2p^2\thinspace^2\!D$ triply-excited states, by direct excitation and transfer-excitation processes, respectively, can also be independently studied. In similar mixed-state beam collisions of 15 MeV C$^{4+}$ with H$_2$, He, Ne and Ar targets, the contributions of the $1s^2$, $1s2s\thinspace^{3,1}S$ beam components to the formation of the $2s2p\thinspace^{3,1}\!P$ states by double-excitation, $1s\rightarrow2p$ excitation and transfer-loss processes can be clearly identified, facilitating comparisons with theoretical calculations.

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Electron impact ionization of ground-state and metastable Li⁺ions

Cited by 2 publications

References 2 publications

Spin asymmetry in electron-impact ionization

Spin asymmetry in electron-impact ionization

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

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Electron impact ionization of ground-state and metastable Li+ions

Cited by 2 publications

References 2 publications

Spin asymmetry in electron-impact ionization

Spin asymmetry in electron-impact ionization

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

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Product

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Electron impact ionization of ground-state and metastable Li⁺ions