Reaction paths, angular scattering and semiclassical scattering effects in slow charge transfer collisions between multiply charged ions and atoms: A progress report

Andersson, L. R.; Danared, H.; Bárány, A

doi:10.1016/0168-583x(87)90413-7

Cited by 15 publications

(12 citation statements)

References 7 publications

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“…9 as an interference oscillation. We note here that a very similar oscillation appears in the differential cross sections calculated by Andersson et a1 (6), even though their method has averaged out all interference effects. He.…”

Section: Results a N D Discussionsupporting

confidence: 71%

“…The shape can be explained in terms of a deflection function and a rainbow phenomenon, as described in Ref. 6. By comparison with the cross section measured by Kamber et a1 (' ) at 247 eV one can see the similarity for the first two "undulations", but the experimental cross section shows an additional third peak at somewhat larger angles.…”

Section: Energy Gain (Ev)mentioning

confidence: 61%

“…These will influence the energy-gain spectra mainly in that peaks will be shifted and become asymmetric, some actually having most of their intensity in a characteristic low-energy-gain shoulder. This effect has been studied in model form by Andersson et a1 (6), who used a semiclassical framework. Recently Hansen and Taulbjerg (' ) performed a close-coupling calculation using a 26state atomic basis expansion in the impact parameter formulation to study similar effects.…”

Section: Results a N D Discussionmentioning

confidence: 99%

“…For practical reasons we here follow the approach of Ref. 6 to generate theoretical energy gain spectra. These are useful in assigning active reaction channels and to some extent necessary to interpret partial cross sections correctly for close-lying channels.…”

Section: Results a N D Discussionmentioning

confidence: 99%

“…The impact energies have typically been in the range 200-2000 eV. We compare our experimental results with a semiclassical collision model (6) to interpret the energy-gain spectra. To explore the angular scattering effects we have also calculated angular differential cross sections for 300 eV 02+ and 200 eV Kr6+ capturing one electron from He.…”

Section: Introductionmentioning

confidence: 99%

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Angular Scattering Effects in Electron Capture by Multiply Charged Ions

et al. 1989

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Energy-gain measurements have been performed o n single-electron capture reactions with low-energy heavy multiply charged ions colliding with He. Because of the large mass ratio between projectile and target, a non-negligible recoil energy is taken up by the target. This results i n energy-gain spectra that are shifted and deformed in such a way that they are difFcult t o resolve into contributions from different reaction channels unfess a theoretical analysis including angular scattering effects is performed. W e have developed a multichannel model for this purpose which also produces angular differential cross sections. A n analysis has been made of the angular scattering present i n the collision systems and theoretical energy gain spectra have been used i n the assignment of reaction channels. A s particular cases we show results from 300 e V 02+ and 200-2000 e V Kr6+ ions capturing one electron from He.

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Section: Results a N D Discussionsupporting

confidence: 71%

Section: Energy Gain (Ev)mentioning

confidence: 61%

Section: Results a N D Discussionmentioning

confidence: 99%

Section: Results a N D Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Angular Scattering Effects in Electron Capture by Multiply Charged Ions

et al. 1989

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State-selective single-electron capture in very slow collisions of Arq+ (q = 4-8) ions with neon

Akgüngör

Ferguson

1999

Rapid Commun. Mass Spectrom.

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State-selective differential cross sections for single-electron capture processes in very slow collisions of Ar q (q = 4-6) ions with neon (Ne) have been studied experimentally at laboratory impact energies between 0.4 and 4 qeV/amu and scattering angles between 0°and 8°by means of the translational energy-gain spectroscopy technique. The translational energy spectra show that the dominant reaction channels are due to capture into excited states of the projectile product Ar (qÀ1) . However, at very low energies, other channels due to transfer excitation processes are found to open at large scattering angles. The energy-gain spectra are interpreted qualitatively in terms of the reaction windows, which are calculated using the singlecrossing Landau-Zener model and the extended version of the classical over-the-barrier model. The energy dependence of cross sections for single-electron capture by Ar q (q = 4-8) ions from Ne are also measured and found to be nearly constant with changing impact energy, but increase with an increase in the projectile charge state. The data are also compared with available measurements and theoretical calculations. Figure 12. Experimental differential cross sections (d'/d) for single-electron capture by Ar 5 ions from Ne at different laboratory collision energies. Smooth lines are drawn to guide the eye.

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