Post–prior discrepancies in CDW–EIS calculations for ion impact ionization fully differential cross sections

Ciappina, M. F.; Cravero, Walter Rubén

doi:10.1088/0953-4075/39/5/008

Cited by 40 publications

(42 citation statements)

References 25 publications

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“…As shown by Belkić et al [46], in the case of simultaneous transfer and ionizaton, due to the potential V corr in the corresponding perturbation, the post form is more adequate than its prior counterpart. However, the calculations of Ciappina et al [47,48] within continuumdistorted-wave-eikonal-initial-state (CDW-EIS) model for ion impact ionization of helium have shown that the prior version gives better agreement with experimental data than the post version calculations.…”

Section: The Results Of Numerical Computationsmentioning

confidence: 99%

Electron correlations in single-electron capture from helium by fast protons andαparticles

Mančev

Milojević

2010

Phys. Rev. A

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Single-electron capture from heliumlike atomic systems by bare projectiles is investigated by means of the four-body boundary-corrected first Born approximation (CB1-4B). The effect of the dynamic electron correlation is explicitly taken into account through the complete perturbation potential. The quantum-mechanical post and prior transition amplitudes for single charge exchange encompassing symmetric and/or asymmetric collisions are derived in terms of two-dimensional real integrals in the case of the prior form and five-dimensional quadratures for the post form. An illustrative computation is performed for single-electron capture from helium by protons and α particles at intermediate and high impact energies. The role of dynamic correlations is examined as a function of increased projectile energy. The validity and utility of the proposed CB1-4B method is critically assessed in comparison with the existing experimental data for total cross sections, and excellent agreement is obtained.

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Section: The Results Of Numerical Computationsmentioning

confidence: 99%

Electron correlations in single-electron capture from helium by fast protons andαparticles

Mančev

Milojević

2010

Phys. Rev. A

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“…This finding was particularly surprising given the fact that the measurements were carried out under kinematical conditions which are believed to be perfectly suitable for applicability of perturbative approaches: (i) |Z p |/v p = 0.1 a.u., where Z p and v p are the projectile charge and velocity, respectively, and (ii) small energy-and momentum-transfer values. Further discussions involved various attempts to explain the source of the discrepancies in the nodal structure, ranging from higher-order [4][5][6][7][8] and non-perturbative mechanisms [7,[9][10][11][12]] to experimental uncertainties [8,13] and so-called projectile coherence effects [14]. Though the explanation due to experimental uncertainties alone was refuted in [15], the very recent 1-MeV p+He experiment at momentum transfer of 0.75 a.u.…”

Section: Introductionmentioning

confidence: 99%

Fully differential cross sections for singly ionizing 1-MeV p +He collisions at small momentum transfer: Beyond the first Born approximation

et al. 2017

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We present calculations of the electron angular distributions in the single ionization of helium by 1-MeV proton impact at momentum transfer of 0.75 a.u. and ejected-electron energy of 6.5 eV. The results using the first and second Born approximations and the 3C model with different trial helium functions are compared to the experimental data. A good agreement between theory and experiment is found in the case of the 3C final state and a strongly correlated helium wave function. The electron-electron correlations in the He atom are found to influence the ratio of the binary and recoil peak intensities.

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Section: Introductionmentioning

confidence: 99%

“…A lesser number of papers [14,18,20,23,24,28,29,31,33,[35][36][37][38][39][40][41] have been devoted to the more extreme system Au 53+ + He where the projectile interaction with the He target is very much stronger. Bridging the strength gap, there has also been work on single ionization of He by Au 24+ [23,28,31,39,41]. The experimental studies have ranged from single differential cross sections to double differential cross sections, but only in recent years have fully differential measurements become available [19][20][21][22][23][24][26][27][28]39].…”

Section: Introductionmentioning

confidence: 99%

Coincidence studies of He ionized byC6+,Au24+, and
McGovern
¹
,
Assafrão
²
,
Mohallem
³

et al. 2010
Phys. Rev. A

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A recently developed [Phys. Rev. A 79, 042707 (2009)] impact parameter coupled pseudostate approximation (CP) is applied to calculate triple differential cross sections for single ionization of He by C 6+ , Au 24+ , and Au 53+ projectiles at impact energies of 100 and 2 MeV/amu for C 6+ and 3.6 MeV/amu for Au 24+ and Au 53+ . For C 6+ , satisfactory, but not perfect, agreement is found with experimental measurements in coplanar geometry, but there is substantial disagreement with data taken in a perpendicular plane geometry. The CP calculations firmly contradict a projectile-nucleus interaction model which has been used to support the perpendicular plane measurements. For Au 24+ and Au 53+ , there is a complete lack of accord with the available experiments. However, for Au 24+ the theoretical position appears to be quite firm with clear indications of convergence in the CP approximation and very good agreement between CP and the completely different three-distorted-waves eikonal-initial-state (3DW-EIS) approximation. The situation for Au 53+ is different. At the momentum transfers at which the measurements were made, there are doubts about the convergence of the CP approximation and a factor of 2 difference between the CP and 3DW-EIS predictions. The discord between theory and experiment is even greater with the experiment giving cross sections a factor of 10 larger than the theory. A study of the convergence of the CP approximation shows that it improves rapidly with reducing momentum transfer. As a consequence, lower-order cross sections than the triple are quite well converged and present an opportunity for a more reliable test of the experiment.

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Post–prior discrepancies in CDW–EIS calculations for ion impact ionization fully differential cross sections

Cited by 40 publications

References 25 publications

Electron correlations in single-electron capture from helium by fast protons andαparticles

Electron correlations in single-electron capture from helium by fast protons andαparticles

Fully differential cross sections for singly ionizing 1-MeV p +He collisions at small momentum transfer: Beyond the first Born approximation

Coincidence studies of He ionized byC6+,Au24+, and
McGovern
¹
,
Assafrão
²
,
Mohallem
³

et al. 2010
Phys. Rev. A

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Post–prior discrepancies in CDW–EIS calculations for ion impact ionization fully differential cross sections

Cited by 40 publications

References 25 publications

Electron correlations in single-electron capture from helium by fast protons andαparticles

Electron correlations in single-electron capture from helium by fast protons andαparticles

Fully differential cross sections for singly ionizing 1-MeV p +He collisions at small momentum transfer: Beyond the first Born approximation

Coincidence studies of He ionized byC6+,Au24+, andMcGovern1, Assafrão2, Mohallem3 et al. 2010Phys. Rev. A

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Coincidence studies of He ionized byC6+,Au24+, and
McGovern
¹
,
Assafrão
²
,
Mohallem
³

et al. 2010
Phys. Rev. A