Auger electron emission following double electron capture in 150-keV<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>1</mml:mn><mml:mn>0</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>+He collisions

Frémont, F.; Merabet, H.; Chesnel, Jean-Yves; Husson, X.; Lepoutre, A.; Lecler, D.; Rieger, Georg W.; Stolterfoht, N.

doi:10.1103/physreva.50.3117

Cited by 30 publications

(10 citation statements)

References 23 publications

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“…At the conclusion of the time propagation for each trajectory, the binding energies of the electrons were examined to determine whether a SEC or MEC event had occurred. For the MCLZ method, the multichannel probability approach of Janev et al (1983) was adopted with radial couplings estimated for monoelectronic transitions following Olson & Salop (1976) and dielectronic transitions following Fremont et al (1994). Further details concerning the MCLZ and CTMC methods as well as final-state-selective results will be presented in a later paper.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission

Ali

Neill

Beiersdörfer

et al. 2005

ApJ

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We report laboratory studies of the role played by multiple-electron capture (MEC) in solar wind-induced cometary X-ray emission. Collisions of Ne 10ϩ with He, Ne, Ar, CO, and CO 2 have been investigated by means of the traditional noncoincident-singles X-ray spectroscopy in addition to the triple-coincidence measurements of X-rays, scattered projectile, and target recoil ions for the atomic targets. The coincidence measurements enable one to reduce the singles X-ray spectra into partial spectra originating in single-electron capture (SEC) and MEC collisions. The measurements provide unequivocal evidence of the significant role played by MEC and strongly suggest that models based solely on SEC are bound to yield erroneous conclusions on the solar wind composition and velocities and on cometary atmospheres. The experimental relative importance of MEC collisions is compared with the molecular classical-over-the-barrier model, the classical trajectory Monte Carlo technique, and the multichannel Landau-Zener method, calculations that can qualitatively reproduce the experimental trends.

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Section: Theoretical Considerationsmentioning

confidence: 99%

On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission

Ali

Neill

Beiersdörfer

et al. 2005

ApJ

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“…Elaborate quantum multistate close coupling calculations [2] give precise cross sections for production of either configurations. Contributions of single capture followed by transfer excitation and of other dielectronic interactions for populating asymmetrical configurations [3][4][5] depend on collision systems and impact energies. In the case of primary population into ͑n, n 0 ͒ symmetrical configurations which are strongly mixed with (low n 1 , high n 2 ) Rydberg states, the transfer from the former to the latter by autotransfer to Rydberg states (ATR) is very efficient [6,7].…”

mentioning

confidence: 99%

Double Rydberg States Formed in Stabilized Triple Electron Capture

et al. 1996

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Double Rydberg states were populated by triple electron capture in collisions of highly charged ions with atoms. The highest stabilization of states produced by triple capture at y Х 0.2 a.u. was found for binding energies of the projectile electrons near the limits of the ͑2, n, n 0 ͒ and ͑3, n, n 0 ͒ series. Population of triply excited double Rydberg states was confirmed by the emission of Rydberg transitions. Results are interpreted by two successive autotransfer into Rydberg states for ͑3, n, n 0 ͒ states and of one-step two-electron autotransfer for ͑2, n, n 0 ͒ states. [S0031-9007(96)01692-4]

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“…Ne 10+ +He is a collision system that received much attention, but without reaching consensus. Several experimental reports argued in favor of correlated double capture and correlated transfer excitation [49][50][51], while others stressed the importance of auto-transfer to Rydberg states [43,[52][53][54][55]; whereas a theoretical study [56] found that both auto-transfer to Rydberg states and static configuration interaction populate the (3, n) Rydberg series. The debate continued in more recent work involving other collision systems [57,58].…”

Section: Introductionmentioning

confidence: 99%

Charge-exchange x-ray spectra: Evidence for significant contributions from radiative decays of doubly excited states

et al. 2016

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Charge exchange collisions of slow Ne 10+ ions with He, Ne, and Ar targets were studied with simultaneous x-ray and cold-target recoil-ion momentum spectroscopy proving the contribution of several mechanisms to the radiative stabilization of apparent (4,4) doubly excited states for He and Ne targets and of (5,6) states for Ar. In particular, the stabilization efficiency of the dynamic auto-transfer to Rydberg states mechanism is confirmed. Moreover, we present evidence for direct radiative decays of (4,4) states populated in collisions with He, which may be the first experimental indication of the population of so-called unnatural parity states in such collisions. These mechanisms lead to the emission of x rays that have considerably higher energies than those predicted by current spectral models and may explain recent observations of anomalously large x-ray emission from Rydberg levels.

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Auger electron emission following double electron capture in 150-keVNe10++He collisions

Cited by 30 publications

References 23 publications

On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission

On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission

Double Rydberg States Formed in Stabilized Triple Electron Capture

Charge-exchange x-ray spectra: Evidence for significant contributions from radiative decays of doubly excited states

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