Effective single-electron treatment of ion collisions with multielectron targets without using the independent-event model

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

doi:10.1103/physreva.104.042820

Cited by 10 publications

(3 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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]. Recently, we implemented an effective one-electron description of the molecular hydrogen target in Plowman et al [24] and calculated total cross sections for all one-electron processes.…”

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

confidence: 99%

See 1 more Smart Citation

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

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

confidence: 99%

“…Therefore, the DI amplitude given by Eq. (30) does not need to be transformed since it is defined in the laboratory frame. However, the ECC amplitude given by Eq.…”

Section: Differential Cross Sectionsmentioning

confidence: 99%

Differential scattering in proton collisions with molecular hydrogen

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…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