Orientation and alignment generated from photoionization of closed-shell cations

Kleiman, U.; Becker, Uwe

doi:10.1016/j.elspec.2004.08.003

Cited by 9 publications

(5 citation statements)

References 72 publications

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“…Calculation (c) shows a minimum for the alignment close to the threshold, caused by a shape resonance above the threshold [4,14], whereas the data of calculation (a) and (b) are slowly decreasing for decreasing photoelectron energy, having the shape resonance below the threshold. The shape resonance is shifted to smaller energies along iso-electronic sequences such as Ar and K + [18]. The J = 2 fine structure state shows a similar behaviour.…”

Section: Potassiummentioning

confidence: 77%

“…While considering our full open shell approach (a) as best, but realizing that a variety of numerical data are already available for closed shell atoms or cations (e.g. [16,18]), it might often be easier to calculate the open shell data using the ionic potential of the closed (sub-)shell ion (calc. b).…”

Section: Methodsmentioning

confidence: 99%

“…In addition to the cross section, such experiments yield electronic structure information in terms of alignment and orientation parameters which are related to deformation and spatial orientation of the electronic charge cloud, and to non-statistical population of the magnetic sublevels, respectively. Most experimental and theoretical investigations, however, have been performed on closed shell atoms [3,8,[12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Approaches for calculating alignment and orientation of photoionized open shell atoms

Lohmann

Kleiman

2005

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

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A method is proposed for calculating alignment and orientation for open shell atoms after photoionization of an inner shell by relating the open shell dipole matrix elements to those independent of the outer open shell configuration. Thus, an extended and usually non-trivial numerical open shell approach is avoided. Our method can be applied to different configuration potentials which is illustrated by Hartree–Fock calculations of alignment and orientation which have been performed for the L3 photoionization of K, Au, Sc and Mn, and for the M5 and N7 photoionization of In and Tl, applying different numerical approaches. Dramatic effects have been found for Mn. The alignment of Au is compared to the experiment.

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Section: Potassiummentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Approaches for calculating alignment and orientation of photoionized open shell atoms

Lohmann

Kleiman

2005

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

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“…[40][41][42]. More recently, orbital alignment has, for instance, been explored for single photoionization of initially closed-shell atoms and cations with respect to spin-orbit coupling [43,44] and for strong-field ionized atoms [45,46].…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations

2022

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We theoretically study orbital alignment in x-ray-ionized atoms and ions, based on improved electronicstructure calculations starting from the Hartree-Fock-Slater model. We employ first-order many-body perturbation theory to improve the Hartree-Fock-Slater calculations and show that the use of first-order-corrected energies yields significantly better transition energies than originally obtained. The improved electronic-structure calculations enable us also to compute individual state-to-state cross sections and transition rates and, thus, to investigate orbital alignment induced by linearly polarized x rays. To explore the orbital alignment of transiently formed ions after photoionization, we discuss alignment parameters and ratios of individual state-resolved photoionization cross sections for initially neutral argon and two exotic electronic configurations that may be formed during x-ray multiphoton ionization dynamics induced by x-ray free-electron lasers. We also present how the orbital alignment is affected by Auger-Meitner decay and demonstrate how it evolves during a sequence of one photoionization and one Auger-Meitner decay. Our present work establishes a step toward investigation of orbital alignment in atomic ionization driven by high-intensity x rays.

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“…Kleiman et al [16] presented a complete set of alignment parameters for the single PI process of atoms in the ground state using a relaxed orbital method within a single-configurational Hartree-Fock (HF) approach. They also dealt with the orientation and alignment generated from PI of closed-shell cations [17]. Inal et al [18] studied the alignment parameters and polarization properties of the  p s p 2 3 2 5 6 lines following inner-shell PI of Na-like ions within Dirac's relativistic approach.…”

Section: Introductionmentioning

confidence: 99%

Polarization transfer in x-ray transitions due to photoionization in highly charged copper-like ions

Chen

Xie

et al. 2018

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

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Using the density matrix theory and the multi-configuration Dirac-Fock method, the d 3 3 2 subshell photoionization of highly charged ions is studied, together with their subsequent radiative decay. The effects of polarization transfer on the linear polarization and angular distribution of the  d s D d p P 3 4 3 4 9 2 2 3 2 10 2 1 2 characteristic line photoemission for selected Cu-like Zn + , Ba 27+ , + W 45 , and + U 63 ions are investigated. Our results show that the polarization transfer, arising from the originally polarized incident light, may lead to a considerable change in the alignment parameters and the polarization properties of the radiation, the character of which is highly sensitive to the initial photon polarization, yet virtually independent of the photon energy. These characteristics are very similar to those of the electron bremsstrahlung process reported by Märtin et al (2012 Phys. Rev. Lett. 108 264801). The present results are compared with available experimental results and show a good quantitative agreement.

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Orientation and alignment generated from photoionization of closed-shell cations

Cited by 9 publications

References 72 publications

Approaches for calculating alignment and orientation of photoionized open shell atoms

Approaches for calculating alignment and orientation of photoionized open shell atoms

Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations

Polarization transfer in x-ray transitions due to photoionization in highly charged copper-like ions

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