Physical Mechanisms and Scaling Laws of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Shell Double Photoionization

Hoszowska, J.; Kheifets, Anatoli; Dousse, J.‐Cl.; Berset, M.; Bray, Igor; Cao, Wei; Fennane, K.; Kayser, Yves; Kavčič, M.; Szlachetko, Jakub; Szlachetko, M.

doi:10.1103/physrevlett.102.073006

Cited by 71 publications

(74 citation statements)

References 35 publications

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“…Although for Mg and Al the K˛h 1 X-ray transition was much too weak to be observed, it was measured for the first time for Si. The obtained E K˛h 1 and K˛h 2 hypersatellite and E K˛˛h 2 TEOP energies are summarized in Table 2 and compared to the few existing data and the most recent theoretical calculations from Martins et al [52], Costa et al [51], Natarajan [53] and Saha et al [56]. The energies of the K˛h 2 and K˛˛h 2 transitions for lower Z elements are in good to very good agreement within the experimental uncertainties with different theoretical predictions.…”

Section: Radiative Decay Of Double K-shell Hole Statessupporting

confidence: 53%

“…In the same spirit, to assess the effect of outer shell electrons and the relative importance of initial-state and final-state electron-electron correlations to the K-shell DPI, an empirical SO-KO model based on an incoherent summation of the doubleto-single cross section ratios for the shake process and knock-out was proposed [1,2]. In our SO-KO model the double-to-single photoionization ratio as a function of the photon energy is given by:…”

Section: Resultsmentioning

confidence: 99%

“…Further, as shown in Fig. 5, the double photoionization cross sections in the range 2 ≤ Z ≤ 47 exhibit an universal scaling behavior in reduced coordinates 2+ Z *3.68 against (E − E 2+ )/Z *2 and coincide with the 2+ Z *4 for the He isoelectronic series [1,2]. [40] and experimental data for Ti [38], Cu [13] and Ag [12] as a function of the scaled excess energy.…”

Section: Double-photoionization Cross Sectionsmentioning

confidence: 99%

“…Since in photoabsorption or inelastic X-ray scattering processes, the incoming photon interacts with a single electron, the ejection of the two 1s electrons is driven by many-electron interactions. The latter playing a key role in the understanding of atomic structure (see [1,2] and references therein), single-photon double ionization processes have received a renewed interest in the last decade. The same holds for the decay of K-shell hollow atoms in which electron correlation effects do also play a crucial role.…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced K-shell hollow atoms

Hoszowska

Dousse

2013

Journal of Electron Spectroscopy and Related Phenomena

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The mechanisms leading to the production of hollow K shell atoms via single photon impact were investigated for a variety of light elements with 12 ≤ Z ≤ 23. The double 1s vacancy states were produced by irradiating the samples with intense monoenergetic synchrotron radiation beams. The double-to-single K-shell photoionization probabilities P KK and the absolute double K-shell photoionization cross sections 2+ were determined by measuring with a high-resolution bent von Hamos crystal spectrometer the K˛h hypersatellite X-ray emission of the samples. The measurements were performed over a wide range of incoming photon energies from threshold up to energies beyond the broad maximum of the double-tosingle photoionization cross section ratios. The P KK and 2+ were determined from the relative yields of the resolved K˛h hypersatellite lines. For Mg, Al and Si, the two-electron one-photon (TEOP) K˛˛h transitions which represent an alternative but much weaker decay channel for double 1s vacancy states could be also observed, using a highly efficient flat crystal wavelength dispersive spectrometer. This observation of single photon-induced TEOP transitions has shown that the I(K˛h)/I(K˛˛h) branching ratios are very poorly reproduced by most of existing theoretical models. Besides the relative yields of the hypersatellite and TEOP transitions, the energies and natural linewidths of the K˛h and K˛˛h X-ray lines were also determined. The energies are found to be in good agreement with different theoretical predictions, whereas the linewidths are significantly underestimated by the calculations, except if non-lifetime broadening effects such as the outer-shell ionization and the open valence configuration are taken into consideration.

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Section: Radiative Decay Of Double K-shell Hole Statessupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Double-photoionization Cross Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoinduced K-shell hollow atoms

Hoszowska

Dousse

2013

Journal of Electron Spectroscopy and Related Phenomena

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“…11 On the other hand, core-to-core XES can be used as a probe of inner shell electron correlations, multi-electron scattering and electron rearrangement processes. 17 High energy resolution XES enables to probe the ligand environment of a metal of interest. 12,[18][19][20][21][22] Access to the ligand orbital is obtained by ionizing the core electron and measuring the following valence-to-core transition.…”

Section: Introductionmentioning

confidence: 99%

A von Hamos x-ray spectrometer based on a segmented-type diffraction crystal for single-shot x-ray emission spectroscopy and time-resolved resonant inelastic x-ray scattering studies

Szlachetko

Nachtegaal

Boni

et al. 2012

Review of Scientific Instruments

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167

145

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We report on the design and performance of a wavelength-dispersive type spectrometer based on the von Hamos geometry. The spectrometer is equipped with a segmented-type crystal for x-ray diffraction and provides an energy resolution in the order of 0.25 eV and 1 eV over an energy range of 8000 eV-9600 eV. The use of a segmented crystal results in a simple and straightforward crystal preparation that allows to preserve the spectrometer resolution and spectrometer efficiency. Application of the spectrometer for time-resolved resonant inelastic x-ray scattering and single-shot x-ray emission spectroscopy is demonstrated.

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Diagram, valence‐to‐core, and hypersatellite Kβ X‐ray transitions in metallic chromium

et al. 2019

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We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the present study confirms the line shape features observed in previous works, whereas the Khβ hypersatellite transition was found to exhibit a complex spectral line shape and a characteristic low‐energy shoulder. The energy shift of the hypersatellite relative to the parent diagram line was deduced from the measurements and compared with the result of extensive multiconfiguration Dirac–Fock (MCDF) calculations. A very good agreement between experiment and theory was found. The MCDF calculations were also used to compute the theoretical line shape of the hypersatellite. A satisfactory agreement was obtained between the overall shapes of the experimental and theoretical spectra, but deviations were observed on the low‐ and high‐energy flanks of the hypersatellite line. The discrepancies were explained by chemical effects, which were not considered in the MCDF calculations performed for isolated atoms.

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Physical Mechanisms and Scaling Laws ofK-Shell Double Photoionization

Cited by 71 publications

References 35 publications

Photoinduced K-shell hollow atoms

Photoinduced K-shell hollow atoms

A von Hamos x-ray spectrometer based on a segmented-type diffraction crystal for single-shot x-ray emission spectroscopy and time-resolved resonant inelastic x-ray scattering studies

Diagram, valence‐to‐core, and hypersatellite Kβ X‐ray transitions in metallic chromium

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