Electron Capture in Ion-Atom Collisions

Taulbjerg, K

doi:10.1007/978-1-4613-3781-2_10

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…This process also involves 3p capture with 3s to 3p core excitation. The reduced contribution of peak C to the total S2' ion yield below 5 keV is difficult to evaluate by means of a simple deconvolution procedure due to the strong overlap of the neighbouring peaks B and C. This complication in the analysis of translational energy spectra has been highlighted recently by Taulbjerg (1989) who estimates that the width W of a channel with corresponding energy defect AE at collision energy E , is given by…”

Section: Electron Capture By S3+ Ions In Hmentioning

confidence: 99%

State-selective electron capture by slow S³⁺recoil ions in H, H₂and He

Wilson

McLaughlin

McCullough

et al. 1990

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

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Translational energy spectroscopy has been used to study electron capture by slow S3+ ions from a recoil ion source. These ions are important in astrophysical plasmas. Cross sections for state-selective electron capture by S3+ ions in H, H, and He have been determined at energies within the range 2.4-9.0 keV. The main excited product channels have been identified and their relative importance has been assessed. In the case of H and He a multichannel Landau-Zener model has been used to predict cross sections which have been compared with experiment. The presence of S3+(4P) metastable as well as S3+(*Po) ground-state ions in our primary beam has been clearly demonstrated. Electron capture by ground-state ions is dominated by 3p electron capture. For H and H, the majority of channels also involve 3s to 3p excitation of the projectile core. Results obtained for all three collision systems provide clear evidence for a S2+(3s23p3d)3F0 state (missing from published tabulations), 15.03 eV above the ground state of S2+. The existence of this state was previously suggested by Dynefors and Martinson.

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Section: Electron Capture By S3+ Ions In Hmentioning

confidence: 99%

State-selective electron capture by slow S³⁺recoil ions in H, H₂and He

Wilson

McLaughlin

McCullough

et al. 1990

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

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“…For example, the strong potential expansion might be used as a starting point for such a comparison. In its prior form, the transition operator involving only the (weak) electron-projectile interaction V, to first order is given by Vp -k V&:Vp, with the Green function G$ including the target potential to all orders (cf, for example, Taulbjerg 1983). Type-l would then correspond to the twobody interaction Vp between electron and projectile, which also provides the leading term in the OBK approximation (Oppenheimer 1928, Brinkmann andKramers 1939).…”

mentioning

confidence: 99%

Classical trajectory studies of charge changing collisions involving Rydberg target atoms

Bradenbrink

Reihl

Roller-Lutz

et al. 1995

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

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Classical trajectory studies of electron capture in ion-Rydberg atom collisions show that the total interaction can roughly be classified into two categories. In a type-1 process, the Rydberg electron is directly captured by the projectile into a stable orbit. This mechanism is very sensitive to the spatial overlap and matching velocities of the Rydberg electron and the projectile. In contrast, in a type-2 capture process the electron returns in a close passage to its own (target) nucleus after its initial atomic orbit has been perturbed by the projectile; this 'double scattering' is rather insensitive to velocity matching. The analogy between these two processes and the leading terms in a strong potential treatment of charge exchange is suggestive. Impact conditions have been identified in which the type-2 process is by far the dominant one.

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