Electron capture and excitation studied by state-resolved KLL Auger measurement in 0.25−2 MeV/u F7+(1s21S, 1s2s3S) + H2/He collisions

Lee, D.H.; Richard, Patrick; Sanders, J. M.; Zouros, T. J. M.; Shinpaugh, J. L.; Varghese, Shinto

doi:10.1016/0168-583x(91)95981-i

Cited by 15 publications

(18 citation statements)

References 14 publications

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“…They backed their interpretation by theoretical cascade calculations for F 7+ impact on He and H 2 and obtained good agreement with the former measurements of Refs. [1,2] above 0.7 MeV/amu.…”

Section: Introductionmentioning

confidence: 96%

“…Some time ago, it was recognized that capture into F 7+ ions results in a rather strong population of the metastable 1s2s2p 4 P final states when compared to the similarly configured 1s(2s2p 3 P ) 2 P − and 1s(2s2p 1 P ) 2 P + states [1,2]. The possible role of cascade effects was mentioned [1] but not analyzed in further detail.…”

Section: Introductionmentioning

confidence: 99%

“…The possible role of cascade effects was mentioned [1] but not analyzed in further detail. Recently, this enhancement of the 1s2s2p 4 P states was determined more quantitatively for 1.1 MeV/amu F 7+ (1s2s 3 S) impact on He and Ne [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
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The population of excited three-electron states in carbon ions after single-electron capture in 0.5-1.1 MeV/amu C 4+ (1s2s 3 S)-He collisions is analyzed theoretically by combining different methods. While the two-center basis generator method is used to calculate capture amplitudes on the single-particle level, all-electron structure calculations for the relevant C 3+ states and their radiative and Auger transition rates are performed on the multiconfiguration Dirac-Fock level. These data are then combined and fed into a set of classical rate equations for the decay dynamics. Total cross sections for the production of the 1s2s2p 4 P , 1s2s2p 2 P − , and 1s2s2p 2 P + states are calculated and their ratios compared with recent experimental data and previous calculations [D. Strohschein et al., Phys. Rev. A 77, 022706 (2008)]. It is found that the relative intensities of the 1s2s2p 4 P states are considerably larger than expected on the basis of pure spin statistics. The Auger transitions, which were not included in the previous calculations, have a significant effect on the final results in that they reduce the 1s2s2p 2 P intensities. Although our extended computations explain a significant part of the production of the 1s2s2p 4 P states, the experimentally observed enhancement of these states is still considerably larger than the theoretical one.1 R = 4 P /( 2 P − + 2 P + ) is used as a shorthand notation for R = Intensity[C 3+ (1s2s2p 4 P )]/(Intensity{C 3+ [1s(2s2p 3 P ) 2 P − ]} + Intensity{C 3+ [1s(2s2p 1 P ) 2 P + ]}).

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
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“…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%

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

Benis¹,

Madesis²,

Laoutaris³

et al. 2018

Preprint

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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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“…Such pre-excited ionic beams are presently used in collisions with electrons, atoms or photons since they allow for the population of states not readily accessible from the ground state. So far the use of pre-excited long-lived states, has been successfully used in high resolution projectile electron spectroscopy investigations, as for example in single [25][26][27] and double [28] electron transfer, excitation [29], transfer-excitation [16,[30][31][32][33], the production of triply-excited states [34] and superelastic scattering [35,36]. 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 [37,38], tokamak high energy charge-exchange [39] and edge impurities [40], electron capture and excitation [41], slow collisions of quasi symmetric heavy systems [42], beam-two-foil spectroscopy [43] and even two-electron quantum entanglement [44].…”

Section: Introductionmentioning

confidence: 99%

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

Benis

Madesis

Laoutaris

et al. 2018

Atoms

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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 ( 1 s 2 1 S , 1 s 2 s 3 , 1 S ) mixed-state beams, the spectrum contributions of the 1 s 2 s 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 1 s 2 s 3 S boron beam component allows for a detailed analysis of the formation of the 1 s 2 s ( 3 S ) n l 2 L states by direct n l transfer. In addition, the production of hollow 2 s 2 p 1 , 3 P doubly- and 2 s 2 p 2 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 1 s 2 , 1 s 2 s 3 , 1 S beam components to the formation of the 2 s 2 p 3 , 1 P states by double-excitation, 1 s → 2 p excitation and transfer-loss processes can be clearly identified, facilitating comparisons with theoretical calculations.

show abstract

Electron capture and excitation studied by state-resolved KLL Auger measurement in 0.25−2 MeV/u F7+(1s21S, 1s2s3S) + H2/He collisions

Cited by 15 publications

References 14 publications

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
View full text Add to dashboard Cite

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
View full text Add to dashboard Cite

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

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

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Electron capture and excitation studied by state-resolved KLL Auger measurement in 0.25−2 MeV/u F7+(1s21S, 1s2s3S) + H2/He collisions

Cited by 15 publications

References 14 publications

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2pRohrbein1, Kirchner2, Fritzsche3 2010Phys. Rev. A2111531View full textAdd to dashboardCite

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2pRohrbein1, Kirchner2, Fritzsche3 2010Phys. Rev. A2111531View full textAdd to dashboardCite

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

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

Contact Info

Product

Resources

About

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
View full text Add to dashboard Cite

Role of cascade and Auger effects in the enhanced population of theC3+(1s2s2p
Rohrbein
¹
,
Kirchner
²
,
Fritzsche
³

2010
Phys. Rev. A
21
11
53
1
View full text Add to dashboard Cite