Fully differential cross sections for single ionization of helium by energetic protons

Abdurakhmanov, Ilkhom; Kadyrov, Alisher; Alladustov, Sh. U.; Bray, Igor; Bartschat, Klaus

doi:10.1103/physreva.100.062708

Cited by 19 publications

(11 citation statements)

References 35 publications

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“…The method was successfully tested at high projectile energy, namely with protons at 1 MeV. The results were in good agreement with other theories, and especially with the absolute scale of the WP-CCC approach [25]. In this work, we wish to explore other kinematical situations.…”

Section: Introductionsupporting

confidence: 56%

Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach

Zaytsev,

Zaytseva,

Zaytsev

et al. 2023

Atoms

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The parabolic quasi-Sturmian approach, recently introduced for the calculation of ion–atom ionizing collisions, is adapted and applied here to the single ionization of helium induced by an intermediate-energy proton impact. Within the method, the ionization amplitude is represented as the sum of the products of the basis amplitudes associated with the asymptotic behavior of the continuum states of the two noninteracting hydrogenic subsystems (e−,He+) and (p+,He+). The p−e interaction is treated as a perturbation in the Lippmann–Schwinger-type (LS) equation for the three-body system (e−,He+,p+). This LS equation is solved numerically using separable expansions for the proton–electron potential. We examine the convergence behavior of the transition amplitude expansion as the number of terms in the representation of the p−e interaction is increased and find that, for some kinematic regimes, the convergence is poor. This difficulty, which is absent for a higher proton energy impact, is solved by varying the momentum of the auxiliary proton plane wave introduced into the basis function. Fully differential cross-sections are calculated and compared with experimental data for 75 keV protons and the results obtained with the 3C model.

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Section: Introductionsupporting

confidence: 56%

Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach

Zaytsev,

Zaytseva,

Zaytsev

et al. 2023

Atoms

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“…Existing theoretical methods deviate from one another significantly and cannot reproduce the experiment well. The single-centre version of the WP-CCC has already been applied to the fully differential cross sections for ionisation in protonhelium collisions [46,47] at sufficiently high impact energies, where the electron-capture channels are believed to be negligible. The results agreed very well with the recent highresolution experiment by Gassert et al [48].…”

Section: Discussionmentioning

confidence: 99%

“…In particular, calculation of the fully differential ionisation cross section remains a challenging problem. For example, the state-of-the-art quantummechanical convergent close-coupling approach to C 6+ + He collisions [5] resulted in differences in the features of the fully differential emission when compared to the threedimensional pattern experimentally observed by Schulz et al [6]. These calculations were performed in the high-energy regime where electron capture is believed to play a negligible role in the collision dynamics, significantly simplifying the theoretical problem.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Energy and Angular Distributions of Electrons Produced in Intermediate-Energy p + H2 Collisions

Plowman

Spicer

Kadyrov

2023

Atoms

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We extend the two-centre wave-packet convergent close-coupling approach to doubly differential ionisation in proton collisions with H2 to intermediate projectile energies. The results for the doubly differential cross section at projectile energies from 48 to 200 keV are presented as a function of the energy and angle of emitted electrons. We consider a wide range of emission angles from 10 to 160∘, and compare our results to experimental data, where available. Excellent agreement between the presented results and the experimental data was found, especially for emission angles less than 130∘. For very large backward emission angles our calculations tended to slightly overestimate the experimental data when energetic electrons are ejected and the doubly differential cross section is very small. This discrepancy may be due to the large uncertainties in the experimental data in this region and the model target description. Overall, the present results show significant improvement upon currently available theoretical results and provide a consistently accurate description of this process across a wide range of incident energies.

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“…Later, this work has been extended by calculating the FDCS both in the scattering and the perpendicular plane. The calculation was done by means of nonperturbative wave-packet convergent-close-coupling method [48]. The qualitative and quantitative discrepancies between the experiment [36] and their theory have been found in the energy range where electron transfer is the dominant channel.…”

Section: Introductionmentioning

confidence: 99%

Triple differential cross sections for single ionization of an atom by bare ion impact

Purkait

Mondal

Haque

et al. 2023

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

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We present triple differential cross sections (TDCS) for single ionization of atoms by proton and highly charged bare ions impact by means of the three-body formalism of the fi rst Born, two-Coulomb wave and three-Coulomb wave methods, respectively. The TDCS has been calculated both in the scattering and perpendicular planes. The purpose of this work is to investigate the validity of different methods as well as the role of interaction between projectile and residual target-ion in the fi nal state for weak perturbation strength with low electron emission energy at several momentum transfers. By comparing our calculations with experimental data, overall, the 3CW predicts better agreement with experiments than other calculations in the scattering plane. In the perpendicular plane, all calculations deviate from experimental data with increasing transverse momentum transfer for p - He collision. At low momentum transfer, the location of binary peak obtained by the FBA calculation is well established with the experiment for proton impact. On the other hand, the 3CW model is in much better agreement with experiments, both in absolute values and peak position for highly charged impact. Finally, the strong influence of the inter nuclear Coulomb distortion on TDCS has been observed at low and intermediate momentum transfer.

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Fully differential cross sections for single ionization of helium by energetic protons

Cited by 19 publications

References 35 publications

Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach

Single Ionization of Helium by Protons of Various Energies in the Parabolic Quasi-Sturmians Approach

Calculation of Energy and Angular Distributions of Electrons Produced in Intermediate-Energy p + H2 Collisions

Triple differential cross sections for single ionization of an atom by bare ion impact

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