Ionisation of He atoms by H+, He2+and Li3+nuclei

Sidorovich, V. A.; Nikolaev, V. S.

doi:10.1088/0022-3700/16/17/016

Cited by 27 publications

(6 citation statements)

References 18 publications

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“…or using the unitarity prescription by Sidorovich and Nikolaev (1983)), good agreement has been obtained between experimental and theoretical double differential cross sections (DDCS) for electron emission in neon double ionisation. It was concluded that correlation effects between the electrons, which are completely neglected in the IPM are of minor importance if only a small fraction of all target electrons is emitted i.e.…”

Section: Double Ionisation At Small and Large Perturbationsmentioning

confidence: 96%

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: Double Ionisation At Small and Large Perturbationsmentioning

confidence: 96%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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“…(Crothers and McCann [1] reported a failure of CDW-EIS in this region in their original paper.) By assuming that probability amplitudes greater than unity are cut off and set to unity (version A) or using a decay model due to Sidorovich and Nikolaev (version B) [15], it is possible to see how the deficiency of CDW-EIS affects the total cross section (see figures 8 and 9). Clearly from the examples shown this lack of unitarity does have an effect, with the new 'cut off' models having a smaller cross section, closer to the available experimental data.…”

Section: Double Ionizationmentioning

confidence: 99%

Multi-ionization of helium and lithium using the independent electron and independent event models with intrinsic CDW

Bradley¹,

Lee²,

McCartney³

et al. 2004

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

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Cross sections for the multi-ionization of He and Li are presented for impact energies in the range of 50 to 1000 keV/amu. These are calculated using the eikonal initial state approximation to represent the input and exit channels of the active electrons. The ionization process is simulated in a variety of ways, most notably an attempt to account for the effects of electron correlation via the inclusion of a continuum density of states (CDS) term. Inadequacies, of the CDW formulation at small impact parameters, and of the models themselves, are discussed and conclusions are drawn on what repercussions this has for the cross sections calculated.

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“…After the calculation of single-particle probabilities p ion r ( ) and p , cap r ( ) we found that they can exceed unity for sufficiently low impact energies and small impact parameters. To solve this problem we used the unitarization procedure suggested by Sidorovich [37] for each jth MO: ´--+…”

Section: Resultsmentioning

confidence: 99%

“…As probabilities may give values larger than unity at intermediate collision energies, even for proton projectiles, we employ the Sidorovich unitarization procedure [37], which has been applied with success, and playing a crucial role, to describe DDCSs within the CDW-EIS approximation, for the impact of Au 53+ on Ar and Ne atoms [38]. This approximation corresponds to the solution of differential balance equations for the populations of the final states provided that inverse transitions to the initial state are neglected.…”

Section: Introductionmentioning

confidence: 99%

Single- and multiple-electron processes in water molecules colliding with proton beams

Terekhin

Quinto

Monti

et al. 2018

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

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Single- and multiple-electron removal processes (ionization, capture and transfer-ionization) from water molecules by the impact of protons have been studied. A prior version of the three-body continuum distorted wave-eikonal initial state (3B-CDW-EIS) approximation within the independent electron approximation is used to calculate transition probabilities as a function of the impact parameter and consequently pure and net absolute cross sections for the collisions under consideration. A unitarization procedure is employed to avoid possible overestimation of the 3B-CDW-EIS single-particle impact parameter probabilities at intermediate collision energies. Multiple-electron transitions are determined using a statistical multinomial distribution. A critical analysis of the validity of this type of distribution for describing pure single-electron processes is presented. The results are compared with other theoretical calculations and available experimental data at impact energies from 50 keV to 5 MeV. New physical insights into the reactions studied are introduced.

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Ionisation of He atoms by H⁺, He²⁺and Li³⁺nuclei

Cited by 27 publications

References 18 publications

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Multi-ionization of helium and lithium using the independent electron and independent event models with intrinsic CDW

Single- and multiple-electron processes in water molecules colliding with proton beams

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