Two-electron excitation to Rydberg levels in fast I6+ on hydrogen collisions

Liao, C.; Hagmann, S.; Zouros, T. J. M.; Montenegro, E. C.; Tóth, G.; Richard, Patrick; Grabbe, S.; Bhalla, C. P.

doi:10.1016/0168-583x(95)00137-9

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…1. In the projectile frame, Auger electrons are emitted with discrete energies, such that in the laboratory frame they appear as sharp lines at energies located symmetrically around the electron cusp [13][14][15][16][17]. Due to the comparably small cross sections for the required inner-shell excitation or ionization of the projectile, no Auger electrons were expected to be observed.…”

Section: Resultsmentioning

confidence: 99%

“…For projectile ionization in fast ion-atom collisions, differential cross sections of the emitted electrons are strongly enhanced in the forward direction. Corresponding spectra can be accessed by measuring the electron cusp, i.e., the energy distribution of electrons emitted under an angle of ϑ e ≈ 0 • with respect to the projectile beam and having a velocity similar to the projectile velocity [2,[10][11][12][13][14][15][16][17][18]. Deviations from a symmetric cusp shape measured in the laboratory frame-of-reference can be traced back to an anisotropic electron emission in the projectile frame [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…[30][31][32][33][34][35]. However, experimental data for corresponding differential ionization cross sections of dressed heavy projectiles did not exceed the level of proof-of-principle [13][14][15][16][17]. Furthermore, an ab initio theory predicting differential and total cross sections for the ionization of multielectron heavy projectiles in ion-atom collisions has not been developed up to now.…”

Section: Introductionmentioning

confidence: 99%

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Strong asymmetry of the electron-loss-to-continuum cusp of multielectronU28+projectiles in near-relativistic collisions with gaseous targets

et al. 2016

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The process of electron-loss to the continuum (ELC) has been studied for the collision systems U 28+ + H 2 at a collision energy of 50 MeV/u, U 28+ + N 2 at 30 MeV/u, and U 28+ + Xe at 50 MeV/u. The energy distributions of cusp electrons emitted at an angle of 0 • with respect to the projectile beam were measured using a magnetic forward-angle electron spectrometer. For these collision systems far from equilibrium charge state, a significantly asymmetric cusp shape is observed. The experimental results are compared to calculations based on first-order perturbation theory, which predict an almost symmetric cusp shape. Some possible reasons for this discrepancy are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong asymmetry of the electron-loss-to-continuum cusp of multielectronU28+projectiles in near-relativistic collisions with gaseous targets

et al. 2016

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“…Traditionally, spectroscopy of electrons emitted from the projectile during non-relativistic ion-atom collisions at energies not exceeding a few MeV/u is performed by electrostatic spectrometers, with typical electron energies of hundreds of eV [1][2][3][4][6][7][8]. For comparison, electrons emitted from the target with energies of a few eV are typically observed by reaction microscopes [12].…”

Section: Methodsmentioning

confidence: 99%

“…The unambiguous identification of ELC requires a coincidence measurement of the emitted electron and the upcharged projectile [1,2]. Previous studies include few-electron light projectiles [3] and manyelectron heavy projectiles [4], but few-electron heavy projectiles were not experimentally studied up to now.…”

Section: Introductionmentioning

confidence: 99%

Forward-angle electron spectroscopy in heavy-ion atom collisions studied at the ESR

Hillenbrand

Hagmann

Litvinov

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. The collision system U 88+ + N2 at a low-relativistic projectile energy of 90 MeV/u has been analyzed experimentally and theoretically with respect to fast electrons emitted with a velocity ve close to the projectile velocity, vp ≈ ve, at an observation angle of ϑe ≈ 0• , i.e., in the direction of the projectile beam. Three distinct processes are identified, where each of the underlying charge-transfer mechanisms leads to a characteristic feature in the asymmetry of the observed electron energy distribution. The experimental results for each of the three processes are compared to the corresponding theoretical models. IntroductionIn collisions of heavy, highly-charged projectile ions with atomic targets, the energy distribution of the emitted electrons is a characteristic observable and highly sensitive to distinguish the underlying elementary processes. The system of beryllium-like U 88+ -projectiles colliding at an energy of 90 MeV/u with a target of N 2 provides a unique possibility of observing three distinct charge-transfer processes with emission of a cusp electron, i.e., an electron with a velocity v e similar to the projectile velocity, v p ≈ v e , emitted parallel to the projectile beam at a polar angle of ϑ e ≈ 0 • : (a) The process of electron loss to continuum (ELC) corresponds to the ionization of the projectile ion, where an electron with binding energy E b p is transfered into the projectile continuum during the collision with the target,

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