Journal ArticleDOI
Selective electron capture into highly stripped Ne and N target atoms after heavy-ion impact
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In this paper, it was shown that selective electron capture is a dominant mechanism for the population of H-, He- and Li-like states of low atomic number (Zt<or=10) target atoms after bombardment with heavy ion projectiles.Abstract:
Auger electron and X-ray spectra from Ne and N gas targets excited with 1.4 MeV amu-1 Ar12+, Kr15+, Xe24+, and Pb36+ ions are measured, varying the target pressure and mixing other gases into the target volume. A dramatic change of line intensities from outer-shell configurations having a KL two-electron core and a third electron in the n=4, 5, 6 shell is observed, depending on the target pressure and systematically on the target ionisation potential. This effect is explained by highly selective electron capture from neutral target atoms or molecules into outer-shell orbitals of slowly (Er<10 eV) recoiling and highly stripped target atoms with metastable core states. It turns out that selective electron capture is a dominant mechanism for the population of H-, He- and Li-like states of low atomic number (Zt<or=10) target atoms after bombardment with heavy-ion projectiles. The capture process is discussed in the framework of a simple classical model and a capture cross section in the order of 10-14 cm 2 is estimated from the experiment.read more
Citations
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Journal ArticleDOI
State-selective electron capture in atom-highly charged ion collisions
Ratko K. Janev,Hannspeter Winter +1 more
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X-ray emission from comets.
TL;DR: Theoretical and observational work has demonstrated that charge-exchange collisions of highly charged solar wind ions with cometary neutral species can explain the x-ray emission from comet Hyakutake.
Journal ArticleDOI
Modeling of cometary x-rays caused by solar wind minor ions
TL;DR: Using the plasma flow in the coma of Hyakutake calculated by a three-dimensional adaptive magnetohydrodynamic model, the density distribution of solar wind ions inThe coma and the resulting x-ray emission were computed and the calculated High Resolution Imager count rate and the spatial distribution of the x-rays agree with the observations.
Journal ArticleDOI
Subshell-selective electron-capture in collisions of c-4+, n-5+, o-6+ with h, h-2 and he
TL;DR: In this paper, the authors determined absolute subshell-selective single electron capture cross sections sigma nl for collisions of C4+, N5+ and O6+ with atomic and molecular hydrogen and helium at impact velocities between 0.1 and 0.5 au.
References
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Journal ArticleDOI
Oscillatory behavior of charge transfer cross sections as a function of the charge of projectiles in low-energy collisions
TL;DR: In this article, the authors examined experimental cross sections for charge transfer in collisions of partially stripped heavy ions with atomic hydrogen at low collision energies, using a model in which the projectiles are replaced by bare nuclei of a given effective charge, and showed the presence of a strong oscillatory dependence of the cross sections on effective charge due to the crossings of diabatic potential curves in the low energy region below 10 keV/amu.
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Electron transfer between multicharged ions and neutral species
Ronald E. Olson,A. Salop +1 more
TL;DR: In this paper, a reduced coupling matrix-element formula has been developed for application to the class of reactions, where the reduced matrix elements have been combined with an absorbing-sphere model based on the Landau-Zener method to obtain a relatively simple formalism for obtaining the electron transfer total cross sections.
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Radiative decays of the n = 2 states of He-like ions
TL;DR: In this paper, the relativistic random-phase approximation (RRPA) is applied to study radiative transitions from $n=2$ states along the He isoelectronic sequence.
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Charge exchange between H(1s) and fully stripped heavy ions at low-keV impact energies
A. Salop,Ronald E. Olson +1 more
TL;DR: In this paper, approximate cross sections for charge transfer between ground-state atomic hydrogen and completely stripped ions of C, N, O, Ne, Si, and Ar have been obtained in the velocity range 6 \ifmmode\times\else\texttimes\fi{}