<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>, Velocity, and Charge Dependence of Zero-Degree Electron "Cusps" from Charge Transfer to Continuum States of Bare and Highly Ionized Projectiles

Vane, C. R.; Sellin, I. A.; Suter, M.; Alton, G.D.; Elston, S. B.; Griffin, P. M.; Thoe, R. S.

doi:10.1103/physrevlett.40.1020

Cited by 53 publications

(11 citation statements)

References 19 publications

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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. Experimental data for the characteristics of the emitted electron provide stringent tests for theory well beyond total ionization cross sections.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

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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“…In particular the "formation of positronium in the continuum" is the clear analogue of "charge exchange into the continuum," which is now well established in heavy particle ion-atom impact ionization. 17 We have argued that the positron threshold is determined by the Coulombdipole mechanism and will give rise to the same form of threshold law,6 because again the slow electron is much closer to the nucleus than it is to the more distant positron. The only difference from the corresponding electron impact case is that the electron emerges on the same side as the positron, but other than that the angular dependence (on "r. r2 is expected also to be weak.6 In contrast, continuum positronium formation is the geometrical inverse of the Wannier mechanism, and I believe the threshold law for it corresponds to the one recently worked out by Klar.18 As seen in Fig.…”

Section: Outline Of Derivationmentioning

confidence: 98%

The Threshold Laws for Electron-Atom and Positron-Atom Impact Ionization

Temkin¹

1983

IEEE Trans. Nucl. Sci.

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“…The Bragg condition, expressed by the delta function in Eq. (18) implies that only the center-of-mass wave vector of the positron±elec-tron pair is relevant for the di raction process. This means that the electron±positron system as whole is di racted when the parallel component of its wave vector is changed by g k during the collision.…”

Section: Electron±positron Emission In Re¯ection Modementioning

confidence: 99%

“…(18). To this end we need assume simple, yet reasonable models for the electronic and crystal structure of the surface.…”

Section: Appendix a Analytical Evaluation Of The Scattering Amplitudementioning

confidence: 99%

Mechanisms of electronic excitations by low-energy positrons: From finite to extended electronic systems

Berakdar

2000

Nuclear Instruments and Methods in Physics Research Section B:

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This work deals with the mechanisms of electronic transitions induced by low-energy positrons. For isolated atomic systems we discuss the role of successive binary collisions, the so-called Thomas mechanisms, between the positron, the excited electron and the atomic core. Furthermore, we consider transfer processes in which one of the charged particles is trapped in a low-lying continuum state of one of the reaction participants. In the second part of the paper, we investigate the various pathways for the secondary-electron emission from metallic surfaces following the bombardment by low-energy positrons. From a formal analysis it is shown that the probability rate for the production of an electron± positron pair is connected to the interacting electron±positron two-particle Green operator. The scattering of the interacting positron±electron subsystem from the crystal potential is treated and it is pointed out that a di raction of the electron±positron pair as a whole might take place leading to characteristic di raction pattern. The analysis is substantiated by numerical studies for the secondary electron emission from Cu(0 0 1) and Fe(1 1 0) (BCC) samples. Ó

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Z, Velocity, and Charge Dependence of Zero-Degree Electron "Cusps" from Charge Transfer to Continuum States of Bare and Highly Ionized Projectiles

Cited by 53 publications

References 19 publications

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

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

The Threshold Laws for Electron-Atom and Positron-Atom Impact Ionization

Mechanisms of electronic excitations by low-energy positrons: From finite to extended electronic systems

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