Experimental determination of the effective solid angle of long-lived projectile states in zero-degree Auger projectile spectroscopy

Benis, E. P.; Madesis, I.; Laoutaris, A.; Nanos, S.; Zouros, T. J. M.

doi:10.1016/j.elspec.2017.10.001

Cited by 7 publications

(22 citation statements)

References 36 publications

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“…In Figure 3, we reproduce high resolution electron spectra obtained in collisions of 17.5 MeV O 4+ and 6.6 MeV C 2+ with H 2 targets, initially reported in Ref. [87]. The measurements were performed with our ZAPS apparatus located at the tandem accelerator facility of "Demokritos".…”

Section: S 2 2s2p 3 Pmentioning

confidence: 86%

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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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Section: S 2 2s2p 3 Pmentioning

confidence: 86%

“…Auger KLL spectra obtained in collisions of 17.5 MeV O 4+ and 6.6 MeV C 2+ with H 2 targets (from Ref [87]…”

mentioning

confidence: 99%

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

Benis¹,

Madesis²,

Laoutaris³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…In Figure 4, we reproduce high resolution electron spectra obtained in collisions of 17.5 MeV O 4+ and 6.6 MeV C 2+ with H 2 targets, initially reported in Ref. [89]. The measurements were performed with our ZAPS apparatus located at the tandem accelerator facility of "Demokritos".…”

Section: S 2 2s2p 3 Pmentioning

confidence: 86%

“…Consequently, the following ratios of the production cross sections should be valid, i.e., σ( 2 S):σ( 4 P):σ( 2 P − ) = 3:2:1. Then the metastable fraction f3 P is obtained as [89]:…”

Section: S 2 2s2p 3 Pmentioning

confidence: 99%

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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.

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Method for determining the lifetimes of the long-lived 1s2s2p 4PJ state J-levels

Nanos

Benis

2019

AIP Conference Proceedings

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Experimental determination of the effective solid angle of long-lived projectile states in zero-degree Auger projectile spectroscopy

Cited by 7 publications

References 36 publications

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

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

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

Method for determining the lifetimes of the long-lived 1s2s2p 4PJ state J-levels

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