Ultralow-Energy Electrons from Fast Heavy-Ion Helium Collisions: The “Target Cusp”

Schmitt, W.; Moshammer, R.; O'Rourke, F. S C; Kollmus, H.; Sarkadi, L.; Mann, R.; Hagmann, S.; Olson, R. E.; Ullrich, J.

doi:10.1103/physrevlett.81.4337

Cited by 33 publications

(19 citation statements)

References 24 publications

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“…Our data do not rule out that the importance of the zero-degree contributions may increase again as the electron velocity approaches the projectile velocity. For small electron energies, there is another type of PCI which becomes important, one that is acting between the residual recoil ion and the ejected electron [32,37]. This recoil-ion PCI is expected to increase as the electron velocity approaches the recoil ion velocity (which is essentially zero), i.e.…”

Section: Methodsmentioning

confidence: 99%

Fully differential cross sections for the single ionization of helium by ion impact

Fischer

Moshammer

Schulz

et al. 2003

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

140

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We present experimental and theoretical fully differential cross sections for single ionization of He by heavy-ion impact for electrons emitted into the scattering plane.Data were obtained for 2 MeV/amu C 6+ and 3.6 MeV/amu Au Q+ (Q = 24, 53) projectiles, corresponding to perturbations (projectile charge to velocity ratio) ranging from 0.7 to 4.4, a regime which is not accessible for electron-impact ionization. We observe a decreasing recoil peak intensity (relative to the binary peak) and at the same time an increasing peak in the forward direction with increasing perturbation. Large discrepancies between experiment and theory are found, which can at least partly be attributed to the use of hydrogenic wavefunctions.2

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Section: Methodsmentioning

confidence: 99%

Fully differential cross sections for the single ionization of helium by ion impact

Fischer

Moshammer

Schulz

et al. 2003

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

140

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show abstract

“…This assessment was reinforced when such spectra were well reproduced by theory, even for 3.6 MeV/amu Au 53+ ions (η = 4.5) colliding with helium [19] and heavy target atoms [20]. However, later this optimism was shaken by the comparison between measured and calculated doubly differential cross sections (DDCSs) as a function of ejected electron energy and projectile scattering angle [21,22].…”

Section: Introductionmentioning

confidence: 99%

Doubly differential spectra of scattered protons in ionization of atomic hydrogen

et al. 2010

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We have measured and calculated doubly differential cross sections for ionization of atomic hydrogen using 75-keV proton impact for fixed projectile energy losses as a function of scattering angle. This collision system represents a pure three-body system and thus offers an accurate test of the theoretical description of the few-body dynamics without any complications presented by electron correlation in many-electron targets. Comparison between experiment and several theoretical models reveals that the projectile-target nucleus interaction is best described by the operator of a second-order term of the transition amplitude. Higher-order contributions in the projectile-electron interaction, on the other hand, are more appropriately accounted for in the final-state wave function.

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“…As illustrated in Figure 42, single ionisation dynamics changes significantly with increasing perturbation for fast, highly-charged fast ion impact (for a detailed discussion see Moshammer et al (1994); Ullrich et al (1995); Moshammer et al (1997a); Schmidt et al (1998);Olson et al (1998) . While the general characteristics of the dynamics prevails, i.e.…”

Section: Single Ionisation At Small and Large Perturbationsmentioning

confidence: 99%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular fragmentation. In a unique combination, large solid angles close to π Microccopes -the "bubble chambers of atomic physics" -mark the decisive step forward to investigate many-particle quantum-dynamics occurring when atomic and molecular systems or even surfaces and solids are exposed to time-dependent external electromagnetic fields.The present review concentrates on just these latest technical developments and on at least four new classes of fragmentation experiments that have emerged within about the last five years. First, multi-dimensional images in momentum space brought unprecedented information on the dynamics of single-photon induced fragmentation of fixed-in-space molecules and on their structure. Second, a break-through in the investigation of highintensity short-pulse laser induced fragmentation of atoms and molecules has been achieved by using Reaction Microccopes. Third, for electron and ion-impact, the investigation of twoelectron reactions has matured to a state such that first fully differential cross sections (FDCS) are reported. Forth, comprehensive sets of FDCS for single ionisation of atoms by ion-impact, the most basic atomic fragmentation reaction, brought new insight, a couple of surprises and unexpected challenges to theory at keV to GeV collision energies. In addition, a brief summary on the kinematics is provided at the beginning. Finally, the rich future potential of the method is shortly envisaged.2

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Ultralow-Energy Electrons from Fast Heavy-Ion Helium Collisions: The “Target Cusp”

Cited by 33 publications

References 24 publications

Fully differential cross sections for the single ionization of helium by ion impact

Fully differential cross sections for the single ionization of helium by ion impact

Doubly differential spectra of scattered protons in ionization of atomic hydrogen

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

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