Four-body charge transfer processes in proton–helium collisions

Chowdhury, Ujjal; Harris, Allison; Peacher, Jerry; Madison, Don H.

doi:10.1088/0953-4075/45/3/035203

Cited by 23 publications

(36 citation statements)

References 35 publications

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“…Chowdhury et al recently presented a series of papers (see, for example, [53]) where they calculated 9D integrals the types in (2) and (3) for TE reactions. They obtained a discrepancy of a factor of 150 between theory and experiment at E p = 300 keV.…”

Section: B 9d Integrationmentioning

confidence: 99%

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: B 9d Integrationmentioning

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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“…The results for the prior and post differential single electron capture cross sections in fast 3 He + - 4 He collisions at 300 keV/amu are displayed in Fig. 3.…”

Section: Cbdw-4b (Post)mentioning

confidence: 99%

“…The importance of this phenomenon in various fields of science has stimulated theoreticial physicists to propose many semiclassical and fully quantum mechanical models for understanding the capture dynamics in different few-body ion-atom collision systems. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Both differential and integral cross sections for charge transfer in different ion-atom collisions have been the focus of some experimental researches. [20][21][22][23] Single-electron capture in the collision of fast singly positive charged helium ions with helium atoms is one of the processes of interest, for which a large number of measured total cross sections exist in the literature.…”

Section: Introductionmentioning

confidence: 99%

Projectile angular-differential cross sections for single electron transfer in fast He ⁺ –He collisions

Ghanbari-Adivi¹,

Ghavaminia²

2015

Chinese Phys. B

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The four-body Coulomb-Born distorted wave approximation is applied to investigate the integral as well as projectile angular-differential cross sections for single-electron capture in the collision of energetic singly positive charged helium ions with helium atoms in their ground states. The formalism satisfies the correct boundary conditions. The influence of the dynamic electron correlations on the cross sections is studied by considering the inter electronic interactions in the complete perturbation potentials in post form. Also, the sensitivity of the cross sections to the static electronic correlations is studied by using the single-zeta and the highly correlated Byron-Joachain wave functions to describe the initial bound state of the active electrons. The obtained results for the energy range of 40-5000 keV/amu are reported and compared with other three-and four-body theoretical data and available experimental measurements. The comparison leads us to discuss the validity of the applied approach and survey the interaction effects on the cross sections by recognizing the electronelectron interaction. Particularly, for differential cross sections, the comparison of the present four-body method with the experiment shows that the agreement is not as good as that for its three-body version.

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Four-body charge transfer processes in proton–helium collisions

Cited by 23 publications

References 35 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

Projectile angular-differential cross sections for single electron transfer in fast He ⁺ –He collisions

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Four-body charge transfer processes in proton–helium collisions

Cited by 23 publications

References 35 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

Projectile angular-differential cross sections for single electron transfer in fast He + –He collisions

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Projectile angular-differential cross sections for single electron transfer in fast He ⁺ –He collisions