Double electron capture in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-He collisions at intermediate energies

Raphaelian, M. L. A.; Berry, H. G.; Berrah, N.; Schneider, Dieter

doi:10.1103/physreva.48.1292

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…However, as the collision velocity is raised, more angular momentum is brought into the collision. For a given transition radius R, characteristic of populating a particular final n, the product mvR increases with v. Such a trend is well established previously [24,25,32,33). Generally, the larger the l of the transferred electrons, the smaller the probability for decay by autoionization [34].…”

Section: IIsupporting

confidence: 83%

“…The overbarrier model of Niehaus, however, does not incorporate any velocity dependence in the capture cross section or predict the angular momentum distribution of the captured electrons. As the collisional velocity increases, higher angular momentum states are observed to be populated [24,25]. An attempt to include velocity dependent efFects in the MCBM was proposed and compared with experiments involving helium targets [26].…”

Section: Introductionmentioning

confidence: 99%

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Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

Raphaelian

Stöckli

et al. 1995

Phys. Rev. A

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Electron capture by Xe + from Ar has been studied for projectile velocities between 0.3 and 1.0 a.u. Coincidence measurements were used to identify experimentally the Bnal states of both target and projectile. The capture of up to eight electrons from the target was observed, while retention of more than three electrons by the projectile was found to be rare. Longitudinal recoil momentum spectroscopy was used to determine average Q values for the capture process as a function of recoil charge state. The Q values were found to have no measurable dependence on projectile velocity and were found to be in good agreement with those values predicted by the extended overbarrier model. Relative cross sections for the diferent 6nal channels were measured and found to be in adequate agreement with the model prediction. A slight increase with increasing projectile velocity in the radiative-stabilization probability for the two-electron states 6nally formed on the projectile was observed.PACS number(s): 34.50.Fa, 34.70.+e, 32.80.Dz

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Section: IIsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

Raphaelian

Stöckli

et al. 1995

Phys. Rev. A

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“…Seely et al (2017) found that autoionizing double capture can lead to an enhancement of X-ray emission following single capture. In addition, basic CX mechanisms for doubly excited state formation have been extensively studied in the keV energy range (Stolterfoht et al 1986;Winter et al 1987;Roncin et al 1989;Posthumus et al 1992;Raphaelian et al 1993;Chesnel et al 1996;Fléchard et al 2001;Zhang et al 2001Zhang et al , 2016Roncin 2020;Guo et al 2023). However, the collision energy dependence of doubly excited states has been sparsely reported for state-resolved double CX.…”

Section: Introductionmentioning

confidence: 99%

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

Cao

Meng

Gao

et al. 2023

ApJS

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The cross sections of state-selective charge exchange (CX) between highly charged ions and neutrals are important for modeling extreme ultraviolet and soft X-ray emissions in many astrophysical objects with hot plasma impacting cold media. By using cold-target recoil-ion momentum spectroscopy, we measure O6+ CX collisions with He and H2 in the collision energy range of 19.5 to 100 keV amu−1. The relative cross sections of state-selective single CX are reported for electron capture into O5+(1s 2 nl) n = 2, 3, 4, 5, ≥6 and n = 3, 4, 5, ≥6 for He and H2, respectively. With the collision energy increasing to 100 keV amu−1, the main capture channel shifts to higher n for both target species as compared to available theoretical results. We also report state-selective cross sections for double CX with He, where doubly excited states of O 4 + ( 1 s 2 nln ′ l ′ ) with nln ′ l ′ being 2s 2 (1S), 2s2p (1P), 2p 2 (1D), and 2p 2 (1S) [symmetric configurations] and 2s3l, 2p3l−2s4l, and 2s5l−2p5l [asymmetric configurations] are distinguished. It is found that the contributions of doubly excited states with asymmetric configurations are dominant and symmetric configurations increasingly come into play with the increase of collision energy. The present results provide experimental benchmarks available for theoretical calculations.

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“…The same method of analysis was also applied to the analysis of the Ne 8+ + He spectrum by Langereis et al to test new calculations of Cornille [16]; as demonstrated recently, their identifications have been found to be often incorrect [21]; the accuracy of their identifications was not given by the authors. Finally, high-resolution electron spectra have also been published by other authors but without any detailed 1s 2 3lnl line identification [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

High-resolution electron spectroscopy of the 1s²3lnl Be-like series in oxygen and neon. Test of theoretical data: I. Experimental method and theoretical background

Bordenave-Montesquieu¹,

Moretto-Capelle²,

Bordenave-Montesquieu³

2002

J. Phys. B: At. Mol. Opt. Phys.

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A complete and accurate experimental test of theoretical spectroscopic data sets (state positions, lifetimes) available for the n = 3–5 terms of the 1s23lnl′ Rydberg series of oxygen and neon ions is presented in a series of two papers. This result was achieved by fitting our high resolution electron spectra with post-collisional lineshapes calculated with the help of these spectroscopic data. In this paper the method which has been developed for this fitting procedure is explained. In addition, as a first test, a comparison of all the available calculated spectroscopic data is presented and discussed. Strong deviations of transition energies and decay lifetimes are observed in many cases. Best data are selected in the following companion paper through a quantitative comparison with our experimental electron spectra.

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Double electron capture inNe8+-He collisions at intermediate energies

Cited by 11 publications

References 11 publications

Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

High-resolution electron spectroscopy of the 1s²3lnl Be-like series in oxygen and neon. Test of theoretical data: I. Experimental method and theoretical background

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Double electron capture inNe8+-He collisions at intermediate energies

Cited by 11 publications

References 11 publications

Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

Energy-transfer processes duringXe30+-Ar collisions for projectile velocities between 0.3 and 1.0 a.u.

State-selective Charge Exchange in 19.5–100 keV amu−1 O6+ Collision with He and H2

High-resolution electron spectroscopy of the 1s23lnl Be-like series in oxygen and neon. Test of theoretical data: I. Experimental method and theoretical background

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Product

Resources

About

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

High-resolution electron spectroscopy of the 1s²3lnl Be-like series in oxygen and neon. Test of theoretical data: I. Experimental method and theoretical background