Plane-wave-factor, molecular-state treatment of electron transfer in collisions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ions with H atoms

Winter, Thomas G.; Hatton, Gregory J.

doi:10.1103/physreva.21.793

Cited by 81 publications

(15 citation statements)

References 45 publications

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“…In Fig. 6 /7 is plotted against the impact velocity, and we see that the present calculation modifies the (fewer state) AO calculation of Bransden and Noble [26] slightly and smoothly connects to the predictions extracted from the MO calculation of Winter and Hatton [24], and tying in with the low energy perturbed stationary state predictions (the five lowest impact energies shown) of Hemert et al [27]. In the high velocity range of the figure the systematic CDW calculations of Belkic et al [25] predict an energy dependence somewhat different from the coupled channel results, extracting from their total cross section tables for He+(2p) capture at v = 1.2 -3.0 a.u.…”

Section: Computational Resultssupporting

confidence: 68%

“…In Figs 4 and 5 we compare the experimental data for ~r2~ and cr3g , respectively, with the present calculation and with the more elaborate 42-state AO-calculation (including pseudo-states) by Shingal and Lin 1-22] and 91-state AO-calculation (including united atom ortibals as well) by Fritsch [23], and with the 10-state MO-calculation by Winter and Hatton [24]. The present 14-state coupled channel calculation (19 states in the usual collision frame) is a small scale study in comparison, but based on independently developed and well tested computer codes [5], and we believe that for this particular collision system the resonant n = 2 charge transfer is well described in a restricted basis without the higher excited (n > 3) target states.…”

Section: Computational Resultsmentioning

confidence: 78%

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Coherence parameters for He+(2p) capture and H(2p) excitation in He2+-H(1s) collisions

Lundsgaard

Nielsen

1995

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Semiclassical coupled channel calculations have been carried out for the collision system He2+-H(ls) in the velocity range 0.t5-3.0 a.u. (impact energies 0.5-225 keV/amu) in order to study capture probabilities and alignment and orientation parameters for the dominant He~(n = 2) channels. A 14-state AO basis set calculation has been combined with an analytical treatment of the asymptotic collision region. For impact velocities about and above v = 0.6 a.u. a strong propensity for resonance capture into an oriented He+(2p) state with the same sense of rotation as the collisional rotation of the internuclear axis is predicted together with a very smooth behaviour of the alignment angle as function of impact parameter. Eikonal method calculations of differential capture cross sections predict that the left/right orientation asymmetry will prevail in differential scattering experiments. The resulting total cross sections for capture into specific n/-substates (n = 2, 3) and the total light polarisation parameter for He +(2p) capture compare well with previous work. Finally we report H(2s,2p) excitation cross sections, probabilities and H(2p) alignment and orientation parameters, following the established propensity rule for orientation in H(2p) excitation.

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Section: Computational Resultssupporting

confidence: 68%

Section: Computational Resultsmentioning

confidence: 78%

Coherence parameters for He+(2p) capture and H(2p) excitation in He2+-H(1s) collisions

Lundsgaard

Nielsen

1995

Z Phys D - Atoms, Molecules and Clusters

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“…5 as functions of the projectile energy. The field-free results are compared with experimental data [24,25] and with two state-of-the-art calculations based on molecular expansions [23,26]. Detailed comparisons with other theoretical (and experimental) data can be found in the latter works and in Refs.…”

Section: Resultsmentioning

confidence: 94%

“…At E P = 0.25 keV/ amu field-free capture is very small, which is due to the fact that the collision system with doubly charged projectile and singly charged target nuclei is asymmetric, and energy is needed to induce transitions between the relevant molecular states [for a correlation diagram of the ͑HHe͒ 2+ system see, e.g., Ref. [23]]. By contrast, field-assisted capture is very efficient for all phases ␦.…”

Section: Resultsmentioning

confidence: 99%

Laser-field-induced modifications of electron-transfer processes in ion-atom collisions

Kirchner

2004

Phys. Rev. A

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Electron transfer in the presence of a laser field is explored for the prototype collision system He 2+ -H͑1s͒ on the basis of a quantum-mechanical calculation. At collision energies E P ജ 2 keV/ amu the capture probabilities are found to be conisderably enhanced or suppressed depending on the exact synchronization of the timedependent projectile and laser interactions. At lower collision energies the total capture cross section is strongly enhanced irrespective of the relative phase between both fields. This enhancement should be directly observable in future experiments.

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“…However, the chosen origin coordinate may be expected to provide accurate enough values of total cross sections for impact velocities lower than 0.5 a.u. (E lab = 75 keV) [27,28], even if transitions driven by rotational couplings could be slightly overestimated. Such a translation effect may be evaluated in the approximation of the common translation factors [29,30].…”

Section: Collision Dynamicsmentioning

confidence: 97%

Theoretical treatment of charge transfer in collisions ofC2+ions with HF: Anisotropic and vibrational effect

et al. 2010

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The charge transfer in collisions of C 2+ ions with the HF molecule has been studied by means of ab initio quantum chemistry molecular methods followed by a semiclassical dynamical treatment in the keV collision energy range. The mechanism of the process, in particular its anisotropy, has been investigated in detail in connection with nonadiabatic interactions around avoided crossings between states involved in the reaction. The vibration of the molecular target has been analyzed and cross sections on different vibrational levels of HF

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Plane-wave-factor, molecular-state treatment of electron transfer in collisions ofHe2+ions with H atoms

Cited by 81 publications

References 45 publications

Coherence parameters for He+(2p) capture and H(2p) excitation in He2+-H(1s) collisions

Coherence parameters for He+(2p) capture and H(2p) excitation in He2+-H(1s) collisions

Laser-field-induced modifications of electron-transfer processes in ion-atom collisions

Theoretical treatment of charge transfer in collisions ofC2+ions with HF: Anisotropic and vibrational effect

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