Differential study of proton-helium collisions at intermediate energies: Elastic scattering, excitation, and electron capture

Spicer, K. H.; Plowman, C. T.; Abdurakhmanov, Ilkhom; Kadyrov, Alisher; Bray, Igor; Alladustov, Sh. U.

doi:10.1103/physreva.104.032818

Cited by 19 publications

(19 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The two-center semiclassical wave-packet convergent close-coupling method (WP-CCC) [4,5] is capable of providing accurate data for various ion-atom collisional processes over the most difficult energy ranges where the different channels all become significant. This has been demonstrated in the earlier works that modelled proton collisions with atomic hydrogen [26,27], collisions of multiply-charged ions with atomic targets [28][29][30] and proton collisions with helium [31][32][33]. Similar calculations for Ne 10+ + H(1s) collisions can help further support fusion and astrophysical plasma research.…”

Section: Introductionsupporting

confidence: 57%

State-selective electron capture in collisions of fully stripped neon ions with ground-state hydrogen

Kotian¹,

Plowman²,

Abdurakhmanov³

et al. 2022

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

Self Cite

View full text Add to dashboard Cite

Electron capture and ionisation in bare neon ion collisions with ground-state atomic hydrogen are modelled over the energy range from 1 to 2000 keV/u using the two-center semiclassical wave-packet convergent close- coupling method. The calculated total electron-capture cross section agrees very well with the molecular and atomic orbital close-coupling calculations at low and intermediate energies. Our results slightly overestimate the experimental results by Meyer et al. [Phys. Rev. A 32, 3310 (1985)], but underestimate the measurements by Panov et al. [Phys. Scr. T3, 124 (1983)] available only below 10 keV/u. At higher energies, where there are no measurements, the results also agree very well with the classical trajectory Monte-Carlo results. Partial n and nl-resolved electron-capture cross sections, important for fusion plasma diagnostics, have also been calculated for final states up to n = 10, where n and l are the final state principal and angular momentum quantum numbers, respectively. The results are generally in good agreement with the atomic calculations. However, due to the finer energy grid used, we are able to detect pronounced oscillations in the state-selective cross sections for n ≥ 8 at energies below 10 keV/u. Our results for the total ionisation cross section are overall in good agreement with the latest classical trajectory Monte-Carlo results.

show abstract

Section: Introductionsupporting

confidence: 57%

State-selective electron capture in collisions of fully stripped neon ions with ground-state hydrogen

Kotian¹,

Plowman²,

Abdurakhmanov³

et al. 2022

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Singly differential cross sections in p + H collisions were investigated with the WP-CCC approach by Plowman et al [25]. The proton-helium differential scatting problem was investigated by Spicer et al [28,29]. An effective oneelectron approach to ion collisions with multielectron atomic targets has been developed in [30].…”

Section: Two-centre Wave-packet Convergent Close-coupling Methodsmentioning

confidence: 99%

Differential scattering in proton collisions with molecular hydrogen

et al. 2022

Self Cite

View full text Add to dashboard Cite

The recently developed two-centre wave-packet convergent close-coupling approach to proton collisions with molecular hydrogen is applied to calculate various singly differential cross sections. The approach is based on an effective one-electron description of the $${\hbox {H}_2}$$ H 2 target. The angular differential cross sections for elastic scattering, total excitation and electron capture are presented. Furthermore, we calculate the singly differential ionisation cross sections as functions of the ejected-electron energy and angle, as well as projectile scattering angle. Good agreement with available experimental data is observed, providing improvement over previous theoretical investigations into the singly differential cross section for ionisation. Specific mechanisms responsible for electron emission in particular kinematic regimes are identified. It is concluded that the effective one-electron WP-CCC method is capable of providing reasonably accurate results on singly differential cross sections for all included interconnected processes taking place in $${\hbox {p}}+{\hbox {H}_2}$$ p + H 2 collisions. Graphic abstract

show abstract

“…Since the WP-CCC method is based on the exact Schrödinger equation, our coefficients are the impactparameter representations of the corresponding full scattering amplitudes. Accordingly, they can be directly used to calculate various singly differential cross sections [37][38][39][40] without further modifications. The method has recently been used to calculate doubly differential cross sections for ion-induced ionization [41].…”

Section: Ctmcmentioning

confidence: 99%

“…The WP-CCC method has been applied to a number of collision systems. Results convergent with regard to parameters n max , l max and N c have been published in [36][37][38][39][40][42][43][44][45][46][47][48][49][50][51][52][53].…”

Section: Ctmcmentioning

confidence: 99%

Atomic collisional data for neutral beam modeling in fusion plasmas

Hill,

Dipti,

Heinola

et al. 2023

Nucl. Fusion

Self Cite

View full text Add to dashboard Cite

The injection of energetic neutral particles into the plasma of magnetic confinement fusion reactors is a widely-accepted method for heating such plasmas; various types of neutral beam are also used for diagnostic purposes. Accurate atomic data are required to properly model beam penetration into the plasma and to interpret photoemission spectra from both the beam particles themselves and from plasma impurities with which they interact. This paper reviews and compares theoretical methods for calculating ionization, excitation and charge exchange cross sections applied to several important processes relevant to neutral hydrogen beams, including H + Be4+ and H + H+. In particular, a new cross section for the proton-impact ionization of H (1s) is recommended which is significantly larger than that previously accepted at fusion-relevant energies. Coefficients for an empirical fit function to this cross section and to that of the first excited states of H are provided and uncertainties estimated. The propagation of uncertainties in this cross section in modeling codes under JET-like conditions has been studied and the newly-recommended values determined to have a significant effect on the predicted beam attenuation. In addition to accurate calculations of collisional atomic data, the use of these data in codes modeling beam penetration and photoemission for fusion-relevant plasma density and temperature profiles is discussed. In particular, the discrepancies in the modelling of impurities are reported.The present paper originates from a Coordinated Research Project (CRP) on the topic of fundamental atomic data for neutral beam modeling that the International Atomic Energy Agency (IAEA) ran from 2017 – 2022; this project brought together 10 research groups in the fields of fusion plasma modeling and collisional cross section calculations. Data calculated during the CRP is summarized in an Appendix and is available online in the IAEA's atomic database, CollisionDB.

show abstract

Differential study of proton-helium collisions at intermediate energies: Elastic scattering, excitation, and electron capture

Cited by 19 publications

References 54 publications

State-selective electron capture in collisions of fully stripped neon ions with ground-state hydrogen

State-selective electron capture in collisions of fully stripped neon ions with ground-state hydrogen

Differential scattering in proton collisions with molecular hydrogen

Atomic collisional data for neutral beam modeling in fusion plasmas

Contact Info

Product

Resources

About