Radiative Auger Effect

Bloch, F.; Ross, P. A.

doi:10.1103/physrev.47.884

Cited by 49 publications

(25 citation statements)

References 7 publications

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“…The radiative Auger effect (RAE) represents an additional decay channel in which a photon and an electron are emitted simultaneously, sharing the available transition energy. This alternative weak deexcitation channel was predicted by Bloch and co-workers already in the 1930s [1,2] and observed byÅberg and Utriainen only about 35 years later [3].…”

supporting

confidence: 55%

“…For a more detailed quantitative comparison the leading peaks of the corresponding DOS curves are quoted in the second column of Table I. The first column of the table lists all KMM shake-up RA dipole transitions allowed by the selection rules proposed by Bloch [1] and Aberg [7]. The energies of the corresponding transitions calculated with the DV-Xα for solid [10] and radiative field methods for atomic Ca [12] are given in the 3rd and 4th column, respectively.…”

Section: A Kmm Ra Shapementioning

confidence: 99%

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High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

et al. 2011

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The KM M radiative Auger (RA) x-ray spectra of solid Ca were induced by monochromatic synchrotron radiation and measured with a high-resolution von Hamos bent crystal spectrometer.Two excitation energies were employed, one in the near K threshold region and the second well above the K absorption edge. The KM M RA spectral structure and relative intensity with respect to the diagram Kβ 1,3 (K − M 3,2 ) line are found to be independent of the excitation energy. The overall RA structure resembles the density of unoccupied s-, p-and d-states. Due to solid state effects, however, spectral features resulting from the major discrete shake-up transitions could not be resolved. For the total KM M RA to Kβ 1,3 yield ratio, a value of 0.053(3) is obtained. The latter is compared to theoretical predictions and available experimental data obtained by various types of target excitation.

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supporting

confidence: 55%

Section: A Kmm Ra Shapementioning

confidence: 99%

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

et al. 2011

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“…Since the low energy tail may contain contributions from Radiative Auger Emission (RAE) satellites [12,13] as well as other satellites due to collective electron behaviours [14,15], this is another result suggesting that collective or second-order phenomena may be behind the strange results displayed in Figure 1. Figure 3 shows the comparison of the longitudinal relaxivity data from water solutions of Endorem [30], Gd-DOTA [20], and three different sizes of functionalized Gd 2 O 3 nanoparticles [26].…”

Section: Ryiedmentioning

confidence: 88%

“…Furthermore, it is important to realise that in parallel to the main process of ionisation of the inner-shells and first-order processes of reorganisation of the electron cloud, namely, the emission of X-rays or Auger electrons, the collision between the incident ions and the sample atoms also induces other secondary processes such as multi-ionisation, electrons shake-up and shake-off, polarisation of atomic orbitals and multiparticle and collective processes such as the emission of Radiative Auger Emission X-rays (RAE) [12,13] and production of intrinsic and extrinsic plasmons [14,15]. The result of all these is that the relative intensity of Xray lines corresponding to transitions to the same subshell ends up being apparently or even in fact dependent on the chemical (or electronic) environment of the emitting ion as well as on the incident ion beam energy.…”

Section: Introductionmentioning

confidence: 99%

L X-Rays RYIED Oscillations and Proton-NMRD of Gd₂O₃ Nanoparticles

Taborda

Reis

Chaves

et al. 2011

Physics Research International

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Recently, it was shown that relative yields of X-rays induced by ion impact are not constant but depend on beam energy. In the framework of this problem, pellets of Gd 2 O 3 and a Gd chelate, Gd-DOTA, as well as a 5 nm in diameter Gd 2 O 3 nanoparticles dispersion on a polycarbonate Nuclepore filter, were studied. In this work, it is shown that after subtraction of known matrix effects, relative yield variations still present different patterns for Gd 2 O 3 pellet and Gd 2 O 3 nanoparticles. Proton NMRD T 1 (ω) data for Gd 2 O 3 nanoparticles and Gd-DOTA water solutions published by Bridot et al. and Toth et al., respectively, were reproduced using a model for paramagnetic substances in water solutions and identical electronic relaxation times. The analysis of both techniques results points collective electron behaviour as the explanation for the different observations on X-ray data of Gd 2 O 3 nanoparticles and bulk material.

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“…The measurements were performed by means of high-resolution X-ray spectroscopy, using for all measurements except the TEOP ones the Fribourg von Hamos Bragg-type curved crystal spectrometer [29,32]. High-energy resolution was mandatory because the Mg, Al and Si K hypersatellites are partly or completely overlapping with the L-satellites of the diagram Kˇ (1s −1 → 3p −1 ) lines, and in the case of Cl, K, and Ca the K˛ hypersatellites need to be resolved from the close lying KMM radiative Auger transitions [33,34].…”

Section: Experimental Methodsmentioning

confidence: 99%

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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Radiative Auger Effect

Cited by 49 publications

References 7 publications

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

L X-Rays RYIED Oscillations and Proton-NMRD of Gd₂O₃ Nanoparticles

Photoinduced K-shell hollow atoms

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Radiative Auger Effect

Cited by 49 publications

References 7 publications

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

High-resolutionKMMradiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

L X-Rays RYIED Oscillations and Proton-NMRD of Gd2O3 Nanoparticles

Photoinduced K-shell hollow atoms

Contact Info

Product

Resources

About

L X-Rays RYIED Oscillations and Proton-NMRD of Gd₂O₃ Nanoparticles