Electron correlations in the antiproton energy-loss distribution in He

Borbély, S.; Tong, Xiao-Min; Nagele, Stefan; Feist, Johannes; Březinová, Iva; Lackner, Fabian; Nagy, L.; Tőkési, K.; Burgdörfer, Joachim

doi:10.1103/physreva.98.012707

Cited by 12 publications

(12 citation statements)

References 74 publications

(152 reference statements)

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“…The more recent correlated two-electron work of Ref. [9], which is shown in Fig. 5, is very close to the MC-CCC data, and thus confirms the inadequacy of the single-active electron approach.…”

Section: Heliumsupporting

confidence: 79%

“…Other theoretical results: the black chain curve is from Ref. [9], the purple short-dashed line from Ref. [11], the red dashed line is the MC-CCC result from Ref.…”

Section: Heliummentioning

confidence: 99%

“…Electron correlation effects on stopping power were dealt with in Ref. [9]. A recent study using interesting methodology that can be implemented for molecular targets on the one hand confirmed the double ionization cross sections for He targets [10], but also pointed out how difficult it is to get a handle on extracting accurate double ionization cross sections.…”

Section: Introductionmentioning

confidence: 98%

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Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem

Lüdde,

Horbatsch,

Kirchner

2021

Preprint

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Energy loss in collisions of charged projectiles with many-electron systems can be dealt with in time-dependent density functional theory by invoking Ehrenfest's theorem for the time evolution of expectation values of observables. We derive an exact expression for the evaluation of energy loss for systems described in a target reference frame, which is a functional of the electron density.Using an approximation scheme we then apply the expression to antiproton-atom collisions at intermediate and high energies within the framework of the basis generator method. The calculations are performed within the semiclassical approximation for the nuclear motion, and a straight-line trajectory is employed. The energy loss is evaluated from an expectation value of the time derivative of the time-dependent projectile potential and avoids the problem of identifying the excited and ionized many-electron contributions in the many-electron wavefunction. There is also no need to invoke the independent-event model, since the calculations are performed within the framework of the independent-electron mean-field model. Detailed comparisons are provided for net ionization and total energy loss of antiprotons colliding with hydrogen, helium, neon, carbon, nitrogen and oxygen.Reasonable agreement is found with the results from one-electron and two-electron calculations for atomic hydrogen and helium, and with experiment in the latter case. For the p − Ne system at intermediate collision energies we find discrepancies with previous work that included only single-electron transitions. The sequence of results for C, N, O, Ne allows one to paint a consistent picture which awaits experimental verification.

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Section: Heliumsupporting

confidence: 79%

“…Other theoretical results: the black chain curve is from Ref. [9], the purple short-dashed line from Ref. [11], the red dashed line is the MC-CCC result from Ref.…”

Section: Heliummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem

Lüdde,

Horbatsch,

Kirchner

2021

Preprint

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show abstract

“…Recently, combined with a second order-split-operator method [40], we extended our 2D generalized pseudo-spectral time-dependent method [37] to a 3D time-propagator [39]. With this generalized 3D time-propagator, in principle, we can study most dynamical processes of atoms in any kind of time-dependent [41] or time-independent external fields [42,43].…”

Section: Introductionmentioning

confidence: 99%

Coulomb effect on the dynamics of atoms in a strong elliptical laser field: Unification of the excitation and ionization

Gao

Tong

2019

Phys. Rev. A

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“…single and double electron continuum states) we applied the K-means clustering analysis as implemented in the Scikit-learn package. The results are shown in The antiproton-helium collisional system is a prototype and has thus been widely investigated [32][33][34][35][36][37][38][39][40] (see also [41,42] for recent reviews on antiproton collisions and [37] for a detailed discussion on electron-electron correlation effects in the antiproton-helium system).…”

Section: A Single Versus Double Electron Continuum Statesmentioning

confidence: 99%

Single- and double-ionization processes using Gaussian-type orbitals: Benchmark on antiproton-helium collisions in the keV-energy range

Gao

Miteva

et al. 2021

Phys. Rev. A

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We present a simple and efficient method for computing single and double ionization cross sections in ion-atom and ion-molecule collisions using L 2 Gaussian basis sets. Gaussian functions are widely employed to compute bound states of ions, atoms and molecules. However, the description of continuum states, and therefore ionization phenomena, remains a theoretical challenge. Our approach is tested on the benchmark system antiproton-helium collisions in the so-called intermediate energy range. A good agreement with numerically exact calculations is observed. The proposed method is general and can thus be employed in any collisional systems in the challenging non-perturbative regime. Our work opens the way to investigate multiple ionization processes by ion impact in multi-center poly-electronic systems.

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Electron correlations in the antiproton energy-loss distribution in He

Cited by 12 publications

References 74 publications

Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem

Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem

Coulomb effect on the dynamics of atoms in a strong elliptical laser field: Unification of the excitation and ionization

Single- and double-ionization processes using Gaussian-type orbitals: Benchmark on antiproton-helium collisions in the keV-energy range

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