Comparison of theoretical and absolute experimental fully differential cross sections for ion-atom impact ionization

Madison, Don H.; Schulz, Michael; Jones, S.; Foster, Matthew S.; Moshammer, R.; Ullrich, J.

doi:10.1088/0953-4075/35/15/305

Cited by 81 publications

(106 citation statements)

References 40 publications

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“…Stefani et al (1990), Whelan et al (1993)). The theoretical results, which include higher-order contributions in the interaction of the projectile with the target beyond the FBA (for details see Madison et al (2002)) were found to be nearly cylindrically symmetric around the q v -axis, a feature characteristic for any first order approach. The sharp 3D minimum at the origin indicates both, the absence of higher-order processes as well as the dominance of dipole transitions.…”

Section: Single Ionisation At Small and Large Perturbationsmentioning

confidence: 97%

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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Section: Single Ionisation At Small and Large Perturbationsmentioning

confidence: 97%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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“…[5]. It is correct for small momentum transfers, when the velocity of the recoil ion is practically zero.…”

Section: From the Energy Conservation Lawmentioning

confidence: 99%

“…This finding was particularly surprising given the fact that the measurements were carried out under kinematical conditions which are believed to be perfectly suitable for applicability of perturbative approaches: (i) |Z p |/v p = 0.1 a.u., where Z p and v p are the projectile charge and velocity, respectively, and (ii) small energy-and momentum-transfer values. Further discussions involved various attempts to explain the source of the discrepancies in the nodal structure, ranging from higher-order [4][5][6][7][8] and non-perturbative mechanisms [7,[9][10][11][12]] to experimental uncertainties [8,13] and so-called projectile coherence effects [14]. Though the explanation due to experimental uncertainties alone was refuted in [15], the very recent 1-MeV p+He experiment at momentum transfer of 0.75 a.u.…”

Section: Introductionmentioning

confidence: 99%

Fully differential cross sections for singly ionizing 1-MeV p +He collisions at small momentum transfer: Beyond the first Born approximation

et al. 2017

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We present calculations of the electron angular distributions in the single ionization of helium by 1-MeV proton impact at momentum transfer of 0.75 a.u. and ejected-electron energy of 6.5 eV. The results using the first and second Born approximations and the 3C model with different trial helium functions are compared to the experimental data. A good agreement between theory and experiment is found in the case of the 3C final state and a strongly correlated helium wave function. The electron-electron correlations in the He atom are found to influence the ratio of the binary and recoil peak intensities.

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“…Furthermore, the experimental cross sections were very well reproduced not only by a sophisticated Continuum Distorted Wave -Hartree-Fock (CDW-HF) calculation, but even by the first Born approximation [24]. It was therefore very surprising when qualitative and large discrepancies were found for the cross sections outside the scattering plane [25].…”

mentioning

confidence: 98%

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.

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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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Comparison of theoretical and absolute experimental fully differential cross sections for ion-atom impact ionization

Abstract: We report fully differential cross section (FDCS) calculations and absolute measurements for ion-atom impact ionization. Using the COLTRIMS (cold target recoil ion momentum spectroscopy) method, we have obtained absolute FDCS both in the scattering plane as

Cited by 81 publications

References 40 publications

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Fully differential cross sections for singly ionizing 1-MeV p +He collisions at small momentum transfer: Beyond the first Born approximation

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

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