Photoionization of closed-shell atoms: Hartree–Fock calculations of orientation and alignment

Kleiman, U.; Lohmann, Bernd

doi:10.1016/s0368-2048(03)00034-3

Cited by 42 publications

(34 citation statements)

References 50 publications

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“…Our results for the integral alignment of the Ne + (2p 2 2 P 3/2 ) state are in agreement with the preceding calculations [13,45]; it is not large and its value smoothly changes in the interval between -0.15 and -0.20 ‡ over the considered broad energy range. For ionization via the Ne + (2p…”

Section: Sequential 2pdi Of Neonsupporting

confidence: 92%

“…• the values of the asymmetry are almost maximal in comparison with asymmetries for other ‡ Kleiman and Lohmann [45] use a coordinate system with the z-axis along the radiation beam. The value of the alignment from [45] is related to the present one as A • as a function of the photon energy for different final multiplet states of Ne ++ (2p 4 ).…”

Section: Sequential 2pdi Of Neonmentioning

confidence: 99%

“…The value of the alignment from [45] is related to the present one as A • as a function of the photon energy for different final multiplet states of Ne ++ (2p 4 ). Curves as in figure 2.…”

Section: Sequential 2pdi Of Neonmentioning

confidence: 99%

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Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Grum-Grzhimailo¹,

Грызлова²,

Meyer³

2012

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

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Abstract. Motivated by the recent achievements of experiments using X-ray free electron lasers, we develop a theory for the angular distributions of photoelectrons in sequential two-photon double ionization (2PDI) of atoms beyond the dipole approximation. Expressions for the angular distributions are obtained taking into account the full multipole expansion of radiation in electric and magnetic moments. The formalism is further specified for the first-order corrections to the dipole approximation. As illustrative example, the sequential 2PDI of the 2p shell in atomic neon is studied. The numerical calculations predict distinct non-dipole effects observable in experiments at present X-ray Free Electron Lasers.

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Section: Sequential 2pdi Of Neonsupporting

confidence: 92%

Section: Sequential 2pdi Of Neonmentioning

confidence: 99%

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Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Grum-Grzhimailo¹,

Грызлова²,

Meyer³

2012

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

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“…The radiation emitted subsequent to filling the vacancy states is anisotropic and polarized. Later, theoretical studies by Scofield [4] and Kleiman and Lohman [5] supported their predictions.…”

Section: Introductionmentioning

confidence: 89%

Kinematic coefficient ratios, anisotropy parameters, and polarization degrees of L₃ X-ray transitions of Bi, Pb, Ta, Lu, and Yb

2015

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The anisotropy parameter values ␤ of the L shell fluorescent X-rays (L (L 3 -M 1 ), L␤ 6 (L 3 -N 1 ), L␣ 1,2 (L 3 -M 5,4 ) and L␤ 2,15 (L 3 -N 5,4 ) of Bi, Pb, Ta, Lu, and Yb excited by 22.6 keV photons were measured. These values were used to determine the kinematic coefficient ratios ␣(L/L␣ 1,2 ), ␣(L/L␤ 6 ), and ␣(L␣ 1,2 /L␤ 2,15 ). The L and L␤ 6 X-rays were found to be anisotropically emitted whereas L␣ 1,2 and L␤ 2,15 X-rays showed less anisotropic spatial distributions. Also, the polarization degrees of L and L␣ X-rays were measured for the present elements and observed that the L lines were found to be strongly polarized whereas the L␣ lines showed less polarization. Résumé: Nous mesurons les valeurs ␤ du paramètre d'anisotropie des rayons X fluorescents de la couche L, (L (L 3 -M 1 ), L␤ 6 (L 3 -N 1 ), L␣ 1,2 (L 3 -M 5,4 ) et L␤ 2,15 (L 3 -N 5,4 ), des éléments Bi, Pb, Ta, Lu et Yb excités par des photons de 22.6 keV. Nous utilisons les valeurs obtenues pour déterminer les rapports des coefficients cinématique ␣(L/L␣ 1,2 ), ␣(L/L␤ 6 ) et ␣(L␣ 1,2 /L␤ 2,15 ). Nous trouvons que les rayons X L et L␤ 6 sont émis de façon anisotrope, alors que L␣ 1,2 et L␤ 2,15 montrent moins d'anisotropie spatiale. Nous mesurons également le degré de polarisation des rayons X L et L␣ et notons que les lignes de L sont fortement polarisées, alors que celles de L␣ le sont beaucoup moins. [Traduit par la Rédaction]

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“…Since the alignment and orientation of the ions are known in various cases from experiment and calculations [49,50], especially for noble gas atoms, one can estimate the expected contribution of the ion alignment and orientation to the angular distribution of the second electron. Consider first 2PDI of np shells of noble atoms.…”

Section: Alignment and Orientation Parametersmentioning

confidence: 99%

Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

Grum–Grzhimailo

Грызлова

Fritzsche

et al. 2015

Journal of Modern Optics

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We present a review of theoretical studies of the simplest nonlinear photoprocesses detected in the XUV range with the use of free electron lasers: sequential double and triple ionization of atoms by two and three XUV photons. Photoelectron angular distributions and angular correlations between emitted electrons are considered. A comparison of the calculated results with recent angle-resolved photoelectron spectroscopy experiments is discussed.

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Photoionization of closed-shell atoms: Hartree–Fock calculations of orientation and alignment

Cited by 42 publications

References 50 publications

Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Kinematic coefficient ratios, anisotropy parameters, and polarization degrees of L₃ X-ray transitions of Bi, Pb, Ta, Lu, and Yb

Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

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Photoionization of closed-shell atoms: Hartree–Fock calculations of orientation and alignment

Cited by 42 publications

References 50 publications

Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Non-dipole effects in the angular distribution of photoelectrons in sequential two-photon atomic double ionization

Kinematic coefficient ratios, anisotropy parameters, and polarization degrees of L3 X-ray transitions of Bi, Pb, Ta, Lu, and Yb

Photoelectron angular distributions and correlations in sequential double and triple atomic ionization by free electron lasers

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Kinematic coefficient ratios, anisotropy parameters, and polarization degrees of L₃ X-ray transitions of Bi, Pb, Ta, Lu, and Yb