Nondipole effects in double K-shell ionization of heliumlike ions

Михайлов, А. И.; Михайлов, И. В.; Moskalev, A.N.; Nefiodov, A. V.; Plunien, G.; Soff, G.

doi:10.1016/j.physleta.2003.08.008

Cited by 8 publications

(17 citation statements)

References 13 publications

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“…Significant effects caused by the magnetic dipole and electric quadrupole transitions in the double photoionization of helium-like ions were previously reported in Ref. [39].…”

Section: Resultsmentioning

confidence: 62%

Relativistic theory of the double photoionization of heliumlike atoms

Yerokhin

Surzhykov

2011

Phys. Rev. A

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A fully relativistic calculation of the double photoionization of heliumlike atoms is presented. The approach is based on the partial-wave representation of the Dirac continuum states and accounts for the retardation in the electron-electron interaction as well as the higher-order multipoles of the absorbed photon. The electron-electron interaction is taken into account to the leading order of the perturbation theory. The relativistic effects are shown to become prominent already for the medium-Z ions, changing the shape and the asymptotic behavior of the photon energy dependence of the ratio of the double-to-single photoionization cross section.

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“…Significant effects caused by the magnetic dipole and electric quadrupole transitions in the double photoionization of helium-like ions were previously reported in Ref. [39].…”

Section: Resultsmentioning

confidence: 62%

Relativistic theory of the double photoionization of heliumlike atoms

Yerokhin

Surzhykov

2011

Phys. Rev. A

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“…However, very little is known about PDI at higher photon energies. The coupling of higher orders of angular momentum of the incoming light, such as the electric quadrupole term, to the two electrons in the atom has only been addressed theoretically [25][26][27][28][29][30]. So far, no experiments have studied non-dipole effects in PDI due to extremely small cross sections.…”

Section: Introductionmentioning

confidence: 99%

Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption

et al. 2013

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We investigate single photon double ionization (PDI) of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back-to-back with equal energy. These slow ions are the unique fingerprint of an elusive quasi-free PDI mechanism predicted by Amusia et al. nearly four decades years ago [J. Phys. B 8, 1248Phys. B 8, , (1975] . It results from the non-dipole part of the electromagnetic interaction. Our experimental data are in excellent agreement with calculations performed using the convergent close coupling and time dependent close coupling methods.

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“…Such cross sections have been analyzed both theoretically (see, e.g., Refs. [9][10][11][12][13]) and experimentally [14][15][16][17][18]). Unlike for the TDCS, however, no parametrizations for the nondipole components of the DDCS (or, equivalently, for the corresponding nondipole asymmetry parameters), have been reported in the literature [19].…”

Section: Introductionmentioning

confidence: 99%

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

et al. 2005

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Similarly to differential cross sections for one-electron photoionization, the doubly differential cross section for double photoionization ͑DPI͒ may be conveniently described by four parameters: the singly differential ͑with respect to energy sharing͒ cross section ͑ 0 ͒, the dipole asymmetry parameter ͑␤͒, and two nondipole asymmetry parameters ͑␥ and ␦͒. Here we derive two model-independent representations for these parameters for DPI from a 1 S 0 atomic bound state: ͑i͒ in terms of one-dimensional integrals of the polarization-invariant DPI amplitudes and ͑ii͒ in terms of the exact two-electron reduced matrix elements. For DPI of He at excess energies, E exc , of 100 eV, 450 eV, and 1 keV, we present numerical results for the asymmetry parameters within the framework of the convergent close-coupling theory and compare them with results of lowest-order ͑in the interelectron interaction͒ perturbation theory ͑LOPT͒. The results for E exc = 1 keV exhibit a nondipole asymmetry that is large enough to be easily measured experimentally. We find excellent agreement between our LOPT results and other theoretical predictions and experimental data for total cross sections and ratios of double to single ionization cross sections for K-shell DPI from several multielectron atoms.

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Nondipole effects in double K-shell ionization of heliumlike ions

Cited by 8 publications

References 13 publications

Relativistic theory of the double photoionization of heliumlike atoms

Relativistic theory of the double photoionization of heliumlike atoms

Ejection of Quasi-Free-Electron Pairs from the Helium-Atom Ground State by Single-Photon Absorption

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

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