Excitation of the 2p level in atomic hydrogen by He+ and H+ impact between 70 and 700 keV

Schartner, K.‐H.; Detleffsen, D; Sommer, B.

doi:10.1016/0375-9601(89)90676-2

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…The second-order terms are neglected. However, we believe that higher order terms are essential for an exact description provided the T-matrix (15) is calculated by a proper numerical method. This would enable one to extend our method to lower energy regions avoiding the inclusion of distorted wave complexities and also to avoid difficulties associated with the semiclassical methods.…”

Section: Discussionmentioning

confidence: 99%

“…In order to calculate the electronic amplitude, A (1) e , for the excitation of atomic hydrogen by proton impact, the transition operator T P e is therefore replaced by the interaction potential, V P e , for the electron and proton of the bound system; i.e. we neglect the integral in equation (15). However, to calculate the nuclear amplitude, A (1) n , by the modified-Coulomb two-body off-shell T-operator, equation ( 16) for T PT is inserted into equation (14).…”

Section: The First-order Born-fadeev Term For Excitationmentioning

confidence: 99%

“…Excitation of atoms by ion impact has been studied intensively in the past few decades, both theoretically and experimentally [15,26,[28][29][30][31]. Note that the available theoretical calculations are mainly based on perturbative methods [8,11,14,22], directly solving the Schrödinger equation by a proper expansion of the initial and final wavefunctions [26] and semiclassical methods [10,11,18,19,25].…”

Section: Introductionmentioning

confidence: 99%

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Excitation of hydrogen atoms at intermediate and high energies by proton impact under a three-body Born–Faddeev-type formalism

Fathi¹,

Ghanbari-Adivi²,

Bolorizadeh³

et al. 2009

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

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In this work, differential cross sections have been calculated for the excitation of atomic hydrogen (H) from its ground state (1s) into a selection of its excited states (2s, 2p0, 2p±1 and 3s). The present study was conducted at intermediate and high proton impact energies within the range 50 keV–1 MeV. A three-body model based on Faddeev-type equations is implemented, while near the energy shell the two-body Coulomb transition matrix was used to calculate the transition amplitude. Second and higher order approximations have been ignored in this case. The resulting amplitudes are subsequently utilized to calculate total and differential cross sections for the corresponding excitation processes. These calculated cross sections have then been compared with available experimental data and other theoretical results from the literature.

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Section: Discussionmentioning

confidence: 99%

Section: The First-order Born-fadeev Term For Excitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Excitation of hydrogen atoms at intermediate and high energies by proton impact under a three-body Born–Faddeev-type formalism

Fathi¹,

Ghanbari-Adivi²,

Bolorizadeh³

et al. 2009

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

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show abstract

“…This process governs the beam attenuation in the plasma. Therefore, a large amount of experimental [10][11][12][13][14][15][16] and theoretical data [17][18][19][20][21][22][23][24][25][26][27][28][29] exists on this system, including the recommended data [6]. Theoretical calculations reproduce the experimental data reasonably well for the dominant channels for the processes such as excitation and electron capture.…”

Section: Introductionmentioning

confidence: 99%

Atomic collisional data for neutral beam modeling in fusion plasmas

Hill,

Dipti,

Heinola

et al. 2023

Nucl. Fusion

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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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Semiempirical Formulae for Inelastic Atomic and Molecular Collisions

Imai

2012

Atomic Processes in Basic and Applied Physics

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Excitation of the 2p level in atomic hydrogen by He+ and H+ impact between 70 and 700 keV

Cited by 12 publications

References 17 publications

Excitation of hydrogen atoms at intermediate and high energies by proton impact under a three-body Born–Faddeev-type formalism

Excitation of hydrogen atoms at intermediate and high energies by proton impact under a three-body Born–Faddeev-type formalism

Atomic collisional data for neutral beam modeling in fusion plasmas

Semiempirical Formulae for Inelastic Atomic and Molecular Collisions

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