Fully-Stripped Beryllium-Ion Collisions with 2ℓm States of Atomic Hydrogen: Target Excitation and Ionisation cross Sections

Antonio, Nicholas W; Plowman, C. T.; Abdurakhmanov, Ilkhom; Bray, Igor; Kadyrov, Alisher

doi:10.3390/atoms10040137

Cited by 5 publications

(18 citation statements)

References 30 publications

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“…Classical ionization cross sections show a similar behaviour to the semiclassical wave-packet convergent close-coupling ionization cross sections. [12] With regards to the threshold region (E � <25 keV/u), the cut-off of the radial microcanonical distribution limits the range of the impact parameter where the ionization process takes place yielding to smaller cross sections than those obtained in the hydrogenic-CTMC calculations which, in general, show a better agreement with the WP-CCC results. This effect, although considerably less perceptible, is also observed in Figure 2, where we have plotted the ionization opacity functions, i. e., the ionization probability distributions [Eq.…”

Section: Integral Cross Sectionsmentioning

confidence: 91%

“…We find that the electron capture cross section becomes considerably smaller than the ionization cross section for impact energies above 50 keV/u. To futher analyze the accuracy of our classical calculations, we have plotted in Figure 4 the electron [12] Figure 2. Ionization opacity functions bP(b) as functions of the impact parameter b for an impact energy of 100 keV/u calculated with (-) h-CTMC and (---) m-CTMC and compared to (-• -) WP-CCC data from Antonio et al [12] Figure 3.…”

Section: Integral Cross Sectionsmentioning

confidence: 99%

“…To futher analyze the accuracy of our classical calculations, we have plotted in Figure 4 the electron [12] Figure 2. Ionization opacity functions bP(b) as functions of the impact parameter b for an impact energy of 100 keV/u calculated with (-) h-CTMC and (---) m-CTMC and compared to (-• -) WP-CCC data from Antonio et al [12] Figure 3. Electron capture cross sections as functions of the impact impact energy in Be 4 + collisions with H(2s) (upper panel) and H(2p) (lower panel) calculated with the (-�-) h-CTMC and the (---) m-CTMC.…”

Section: Integral Cross Sectionsmentioning

confidence: 99%

“…Although scattering cross sections for ion collisions with H (n = 2) are required in the CXRS diagnostics, few theoretical works have considered collisions with excited hydrogen targets. In particular, collisions with Be 4 + projectiles have been studied under the molecular orbital close-coupling (MOCC), [7] atomic orbital close-coupling (AOCC), [8,9] wavepacket convergent closecoupling (WP-CCC), [10][11][12] the numerical solution of the timedependent Schrödinger equation (GTDSE) [13] and CTMC [5,[13][14][15] approaches. At the same time, and due to its toxicity, no experimental measurements in Be 4 + collisions are available.…”

Section: Introductionmentioning

confidence: 99%

“…are processes that become dominant at E > 30 keV/u. We have addressed the study of these processes taking as a reference the recent semiclassical WP-CCC work of Antonio et al, [11] the only one that presents results of ionization and excitation, [12] so our figures will focus on the comparison with the results of these authors. Atomic units (a.u.)…”

Section: Introductionmentioning

confidence: 99%

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Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions

Illescas

2023

ChemPhysChem

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A computational study of Be4++H(2s, 2p) collisions has been carried out employing the Classical Trajectory Monte Carlo (CTMC) method for the impact energy range from 20 keV/u to 1000 keV/u. The integral n partial cross sections for H(n) excitation and Be3+(n) electron capture and, the total ionization and electron capture cross sections are calculated and compared to recent semiclassical results. A general good agreement is observed for the n partial and total electron capture and ionization cross sections. The comparative study of the three inelastic processes show no significant differences between both excited targets.

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Section: Integral Cross Sectionsmentioning

confidence: 91%

Section: Integral Cross Sectionsmentioning

confidence: 99%

Section: Integral Cross Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions

Illescas

2023

ChemPhysChem

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State-selective electron capture in Ar 16 + +

Kotian,

Antonio,

Marchuk

et al. 2024

Plasma Phys. Control. Fusion

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State-selective electron capture in collisions of Ar16+ ions with ground-state hydrogen atoms has been modeled using the two-center wave-packet convergent close-coupling approach. The partially stripped He-like projectile ion is represented using a model potential. Experimental measurements are not available for this collision system and to date, only the classical trajectory Monte Carlo (CTMC) method has been applied to calculate cross sections. The calculated total electron-capture cross section is in good agreement with the previous CTMC results at the low energies but slightly larger at higher energies. This is likely because, in this work, we account for capture into highly excited states, which contribute significantly to the total electron-capture cross section at the intermediate energies. The n-resolved electron-capture cross sections have also been presented for capture into states with n=6-19, where n is the final-state principal quantum number. The most important of these are the cross sections for capture into the n=14-17 states, which are used in charge-exchange recombination spectroscopy (CXRS) techniques. For these cross sections, a significant difference is observed between the present and previously published data. The cross sections differ by an order of magnitude in the 10-60 keV/u energy range. The agreement between the calculations is observed at the energies above 70 keV/u. The nl-resolved electron-capture cross sections have also been presented at 15, 60, 100 and 200 keV/u projectile energies, where l is the final-state angular momentum quantum number.

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Atomic collisional data for neutral beam modeling in fusion plasmas

Hill,

Dipti,

Heinola

et al. 2023

Nucl. Fusion

Self Cite

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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.

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Fully-Stripped Beryllium-Ion Collisions with 2ℓm States of Atomic Hydrogen: Target Excitation and Ionisation cross Sections

Cited by 5 publications

References 30 publications

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions

State-selective electron capture in Ar 16 + +

Atomic collisional data for neutral beam modeling in fusion plasmas

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Fully-Stripped Beryllium-Ion Collisions with 2ℓm States of Atomic Hydrogen: Target Excitation and Ionisation cross Sections

Cited by 5 publications

References 30 publications

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be4++H(2s, 2p) Collisions

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be4++H(2s, 2p) Collisions

State-selective electron capture in Ar 16 + +

Atomic collisional data for neutral beam modeling in fusion plasmas

Contact Info

Product

Resources

About

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions

Calculation of Ionization, Excitation and Electron Capture Cross Sections for Be⁴⁺+H(2s, 2p) Collisions