Projectile ionization in fast heavy-ion—atom collisions

Schneider, D.; Prost, M.; Stolterfoht, N.; Nolte, G.; Bois, R.

doi:10.1103/physreva.28.649

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…For most of the earlier experiments [2][3][4][5][6][7][8][9][10] and consequently theories [11][12][13][14] on ELC concentrated on bare, partially stripped [2][3][4][5][6][8][9][10][11][12][13][14] or neutral heavy projectiles [7], a distinct signature of a cusp/peak was observed in the emitted electron energy spectrum at around v e (velocity of the electron) ≈ v p (velocity of the positron). This peak was attributed to the electron loss from the projectile ion/atom into its low-lying continuum, usually referred to as the ELC peak.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation of positronium in collision with Li ion including electron loss to the continuum

Roy

Sinha

2009

Pramana - J Phys

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Fragmentation of ground state ortho-positronium (Ps) in collision with Li ion (Li + ) is studied in the framework of post-collisional Coulomb distorted eikonal approximation (CDEA), giving special emphasis on the dynamics of the electron loss to the continuum (ELC) that occurs when the electron (e) and the positron (e + ) are very close to each other in the velocity space (v e ≈ vp). The present model takes account of the two-centre effect on the ejected e which is crucial for a proper description of the ELC phenomena. Both the fully differential cross-section (TDCS) and the doubly differential cross-section (DDCS) (energy spectra) are investigated at intermediate and high incident energies. A broad distinct ELC peak centred around ve ≈ vp is noted in the e energy spectrum in contrast to the sharp ELC peak for a heavy projectile, corroborating the experimental findings. Two salient features are noted in the present study: (i) the shift of the e DDCS peak (summed over e + angles) towards higher ejection energy with respect to half the residual energy of the system, (ii) comparison of the e and e + energy spectra reflect a strong e-e + asymmetry with respect to the ratio ve/vp = 1. Both these features are in qualitative agreement with the experimental observations due to Armitage et al for Ps-He atom system and could be attributed to the post-collisional two-centre effect on e due to its parent nucleus (e + ) and the screened target ion. Two different wave functions of the Li ion are chosen in order to test the sensitivity of the present results with respect to the choice of the wave function.

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Section: Introductionmentioning

confidence: 99%

Fragmentation of positronium in collision with Li ion including electron loss to the continuum

Roy

Sinha

2009

Pramana - J Phys

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“…In addition to the total DDCS, the contributions from different ionization processes, relevant for the dressed projectile impact, are also estimated. For reference, it should be mentioned here that some of the contributions were estimated earlier using the Born approximation [54][55][56][57][58], classical trajectory Monte Carlo method (CTMC) [59], or binary encounter approximation [60]. Reference [59] also includes the CDW calculation, including the effective projectile charge to describe the interaction.…”

Section: Introductionmentioning

confidence: 99%

Electron emission in ionization of He and Ne by fast dressed oxygen ions and projectile-charge-state dependence

et al. 2015

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The double-differential cross sections (DDCS) of low-energy electrons emitted at forward, backward, and perpendicular directions are reported for collisions of 3.75 MeV/u O q+ (q = 5, 6, 7, 8) projectiles with He and Ne targets. The measured DDCS are found to be deviating from the q 2 dependence throughout the entire energy region. The effect of projectile electrons, for the dressed ions, as a function of the impact parameter is clearly noticeable for large as well as low-impact parameter collisions. We also present a theoretical calculation based on the prior form of the continuum distorted wave-eikonal initial state approximation, in which the projectile-active electron interaction is modeled with the Green-Sellin-Zachor potential. This particular representation of the potential has been proven to give good qualitative results for projectiles with residual electrons. In addition to the total DDCS, the individual contributions from target ionization, projectile electron loss, and simultaneous ionization processes are also calculated. The total DDCS obtained from these calculations are shown to be in excellent agreement with the experimental observations.

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“…Schneider and coworkers [13] have studied projectile ionization in collisions of fast Ne + and Ar + projectiles with Ne, Ar, Kr, and Xe targets. They have measured the energy dis-M. BREINIG, J.…”

Section: Introductionmentioning

confidence: 99%

Backward ejected electrons produced by 1-MeV/uOq+(q=3–8) projectile ions colliding with argon gas

Breinig¹,

Berryman²,

Segner³

et al. 1994

Phys. Rev. A

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The cross sections for ejecting electrons into a cone of half-angle -2' centered on the backward direction have been measured as a function of electron energy for 1-MeV/u Oq+ (q =3-8) projectiles colliding with Ar. For 0'+ and 0 + projectiles, the cross sections have also been measured in coincidence with exit charge states (q +1) and (q +2) of the projectile. A prominent feature in all spectra is a target LMM Auger peak. The cross sections for producing Ar LMM Auger electrons are nearly independent of projectile incident charge states. A projectile electron-loss peak is produced when the projectile brings loosely bound L-shell electrons into the collision. The shape of this peak is independent of the projectile exit charge state within experimental error. The measured electron-loss production cross sections at 180 are compared with the predictions of various on-shell approximations to the impulse approximation. Peak height and position are sensitive functions of the on-shell approximation used. The predictions of the elastic scattering model agree well with the data.

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Projectile ionization in fast heavy-ion—atom collisions

Cited by 14 publications

References 16 publications

Fragmentation of positronium in collision with Li ion including electron loss to the continuum

Fragmentation of positronium in collision with Li ion including electron loss to the continuum

Electron emission in ionization of He and Ne by fast dressed oxygen ions and projectile-charge-state dependence

Backward ejected electrons produced by 1-MeV/uOq+(q=3–8) projectile ions colliding with argon gas

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