State-selective differential cross sections for single and double electron capture in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>He</mml:mtext></mml:mrow><mml:mrow><mml:mo>+</mml:mo><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mtext>-He</mml:mtext></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mtext>-He</mml:mtext></m

Schöffler, M. S.; Titze, J.; Schmidt, L. Ph. H.; Jahnke, T.; Neumann, N.; Jagutzki, O.; Schmidt‐Böcking, H.; Dørner, R.; Mančev, Ivan

doi:10.1103/physreva.79.064701

Cited by 72 publications

(122 citation statements)

References 31 publications

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“…than the projectile. Gates on the different longitudinal momenta of the recoil ion (p || ) allow us to extract the scattering-angle distribution for a certain final electronic state [31]. The remaining tiny background of statistically false coincidences has been subtracted.…”

Section: Methodsmentioning

confidence: 99%

“…Especially at higher impact energies E p > 100 keV/u, where the final electronic state determination in experiments is challenging or often impossible, the influence of excitation has not been investigated [20][21][22][23]. Projectile scattering angle distributions, which are final state selective, are rather rare [1,24,[26][27][28][29][30][31][32]. All these measurements were only possible due to the development of a modern momentum imaging technique, cold target recoil ion momentum spectroscopy (COLTRIMS) combined with optimized threedimensional focusing ion optics, which achieves longitudinal momentum resolution <0.04 a.u.…”

Section: Introductionmentioning

confidence: 99%

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Transfer excitation reactions in fast proton-helium collisions

et al. 2014

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Continuing previous work, we have measured the projectile scattering-angle dependency for transfer excitation of fast protons (300-1200 keV/u) colliding with helium (p+He → H + He + * ).Our high-resolution fully differential data are accompanied by calculations, performed in the planewave first Born approximation and the eikonal wave Born approximation. Experimentally, we find a deep minimum in the differential cross section around 0.5 mrad. The comparison with our calculations shows that describing the scattering-angle dependence of transfer excitation in fast collisions requires us to go beyond the first Born approximation and in addition to use the initial state-wave function, which contains some degree of angular correlations. * Electronic address: schoeffler@atom.uni-frankfurt.de

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transfer excitation reactions in fast proton-helium collisions

et al. 2014

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“…The COLTRIMS technique has proven to be a powerful tool for revealing the details of the interactive dynamics of atomic collisions [9]. For example, within the past decade a number of experimental measurements [10][11][12][13][14][15][16][17][18] of differential cross sections for single charge exchange in p − He collision via the COLTRIMS technique have spurred renewed interest in theoretical calculations by means of a variety of methods [19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Boundary-corrected four-body continuum-intermediate-state method: Single-electron capture from heliumlike atomic systems by fast nuclei

2015

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Single charge exchange in collisions between bare projectiles and heliumlike atomic systems at intermediate and high incident energies is examined by using the four-body formalism of the first-and second-order theories. The main purpose of the present study is to investigate the relative importance of the intermediate ionization continua of the captured electron compared to the usual direct path of the single electron transfer from a target to a projectile. In order to achieve this goal, comprehensive comparisons are made between the four-body boundary-corrected continuum-intermediate-states (BCIS-4B) method and the four-body boundary-corrected first Born (CB1-4B) method. The perturbation potential is the same in the CB1-4B and BCIS-4B methods. Both methods satisfy the correct boundary conditions in the entrance and exit channels. However, unlike the CB1-4B method, the second-order BCIS-4B method takes into account the electronic Coulomb continuum-intermediate states in either the entrance or the exit channel depending on whether the post or the prior version of the transition amplitude is used. Hence, by comparing the results from these two theories, the relative importance of the intermediate ionization electronic continua can be assessed within the four-body formalism of scattering theory. The BCIS-4B method predicts the usual second-order effect through double scattering of the captured electron on two nuclei as a quantum-mechanical counterpart of the Thomas classical two-step, billiard-type collision. The physical mechanism for this effect in the BCIS-4B method is also comprised of two steps such that ionization occurs first. This is followed by capture of the electron by the projectile with both processes taking place on the energy shell. Moreover, the role of the second, noncaptured electron in a heliumlike target is revisited. To this end, the BCIS-4B method describes the effect of capture of one electron by the interaction of the projectile nucleus with the other electron via the static electron-electron correlations in the target. This effect yields a novelty seen as the second Thomas peak. As an illustration, detailed computations were carried out involving both the differential and total cross sections for one-electron capture in the p − He collisions at intermediate and high impact energies. The results obtained in the BCIS-4B method are compared with those from the CB1-4B method and with the available experimental data. The overall usefulness of the BCIS-4B method is assessed in predicting experimental data for four-body single charge exchange both qualitatively (shapes of cross sections) and quantitatively (numerical values from measurements).

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“…From a theoretical point of view, ion-atom collisions involving two electrons have been used as prototypical systems to investigate various approaches to describe single-electron capture, usually based on the Born distorted wave (BDW) method or the continuum distorted wave (CDW) method in the framework of three-body [13,14,67] or four-body formalisms [12,68,69]. Most of these works are also motivated by the description of features in the differential cross section [13,68,70] that have been observed in recent experiments on charge transfer and transfer ionization processes [71][72][73]. In particular, the Thomas classical double scattering process [1] leads to a peak in the differential cross section at small scattering angles [15,74,75] that is very sensitive to the theoretical method.…”

Section: High Energy Collision (E > 100 Kev/u)mentioning

confidence: 99%

Charge transfer in proton–helium collisions from low to high energy

Loreau

Ryabchenko

Vaeck

2014

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

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The cross section for charge transfer in proton-helium collisions has been computed in the energy range from 10 eV/u up to 10 MeV/u. Four different methods (full quantal time-independent and time-dependent methods, molecular and atomic basis set semi-classical approaches) valid in different energy regimes have been used to calculate the partial and total cross section for single-electron capture. The results are compared with previous theoretical calculations and experimental measurements and the different theoretical methods used are shown to be complementary for describing the charge transfer reaction. A fit of the cross section, valid for collision energies from 10 eV/u up to 10 MeV/u is presented based on these results.

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State-selective differential cross sections for single and double electron capture inHe+,2+-Heandp-He

Cited by 72 publications

References 31 publications

Transfer excitation reactions in fast proton-helium collisions

Transfer excitation reactions in fast proton-helium collisions

Boundary-corrected four-body continuum-intermediate-state method: Single-electron capture from heliumlike atomic systems by fast nuclei

Charge transfer in proton–helium collisions from low to high energy

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