Multielectron transitions in X-ray absorption and inner-shell ionization phenomena

Mukoyama, Takeshi; Ito, Yoshiaki

doi:10.1016/0168-583x(94)95232-9

Cited by 55 publications

(12 citation statements)

References 38 publications

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“…The continuous rise of the curve from zero at threshold is an indication that the satellites originate in a SO, rather than SU, process, since the later results in an intensity jump at the threshold (Å berg, 1972;Armen et al, 1985;Deutsch et al, 1996;Fritsch et al, 1998;Heiser et al, 1994). This is in full accord with the predicted intensity contribution of p1% (Deutsch et al, 1996;Fritsch et al, 1998) for SU in our case, as extrapolated from RMCDF calculations for Ar (Dyall, 1983;Mukoyama and Ito, 1994) and Kr (Wark et al, 1991). Note, however, that a KO process, the crosssection of which also rises continuously from zero, could also be a possible contributor.…”

Section: Article In Presssupporting

confidence: 87%

“…This is in line with shake theory's prediction of an increasing SO/SU ratio with increasing Z and decreasing principal quantum number, n, of the shell of the shaken electron (Å berg, 1972;Mukoyama and Ito, 1994). Trends in recent DF calculations for noble gases (Wark et al, 1991;Mukoyama and Ito, 1994) interpolated to the present case of Z ¼ 29 and n ¼ 1 predict a contribution of less than 1% from shakeup to the total shake probability. The error bars of the data in Fig.…”

Section: [1s] à1 Spectators: Hypersatellitessupporting

confidence: 86%

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The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

Diamant

Huotari

Hämäläinen

et al. 2006

Radiation Physics and Chemistry

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Section: Article In Presssupporting

confidence: 87%

Section: [1s] à1 Spectators: Hypersatellitessupporting

confidence: 86%

The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

Diamant

Huotari

Hämäläinen

et al. 2006

Radiation Physics and Chemistry

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“…Multielectron excitation [11][12][13][14][15][16][17][18] affects seriously the EXAFS signal at the L 3 -edge of Ce-absorption. After removing the multielectron excitation effect which was simulated with a Lorentzian function, the absorption curves were transferred to k space using the formula: k = (2m(E − E o )/ 2 ) 1/2 .…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

XAFS Study on the Local Atomic Structures of CeriumOxide Nanoparticles with Surface Coatings

Zhang

Chen

et al. 2005

Physica Scripta

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Four kinds of cerium oxide nanoparticles coated, respectively, with Sodium bis(2ethylhexyl) sulfosuccinate (AOT), cetyltrimethyl ammonium bromide (CTAB), poly vinyl pyrrolidone (PVP) and those (naked) without surface coating were prepared using chemical method. The particle sizes were identified to be 2 ∼ 3 nm by using transmission electron microscope (TEM) and X-ray diffraction (XRD). Mixed valences of Ce 3+ and Ce 4+ were detected by X-ray absorption near-edgestructure (XANES) spectra. Extended X-ray absorption fine structure (EXAFS) spectra of Ce L 3 -edge were fitted with a core-shell model. The core parts are almost the same as bulk CeO 2 with Ce 4+ characteristic, however their shell parts change with surface coatings. The local atomic structures at shell parts (surface) and the contents and thicknesses of the shell parts were evaluated. The averaged Ce-O bond lengths at surface are changed from 2.504 Å (AOT), 2.568 Å (PVP), 2.628 Å (CTAB) to 2.634 Å (naked). The contents of surface are changed from 49% (AOT), 15% (PVP), 19% (CTAB) to 15% (naked). The results demonstrate that surface coatings have different influences on the surfaces of cerium oxide nanoparticles. A detailed discussion is given in this paper.

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“…Since our P KK values were obtained using the KO curve, this agreement further supports our tentative suggestion of the KO domination near threshold. Figure 3 also shows that experiment is tenfold underestimated by the theoretical nonrelativistic pure SO prediction [26] (dash-dot line). Semiempirical scaling theories [27,28] (dash line), based on the SO-predicted Z ÿ2 dependence of R sat , improve somewhat the agreement, but still leave a sixfold gap.…”

mentioning

confidence: 80%

Intrashell Electron-Interaction-Mediated Photoformation of Hollow Atoms near Threshold

et al. 2008

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Double photoionization (DPI) of an atom by a single photon is a direct consequence of electron-electron interactions within the atom. We have measured the evolution of the K-shell DPI from threshold up in transition metals by high-resolution x-ray emission spectroscopy of the Kh alpha hypersatellites, photoexcited by monochromatized synchrotron radiation. The measured evolution of the single-to-double photoionization cross-section ratio with excitation energy was found to be universal. Theoretical fits suggest that near threshold DPI is predominantly a semiclassical knockout effect, rather than the purely quantum-mechanical shake-off observed at the infinite photon energy limit.

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Multielectron transitions in X-ray absorption and inner-shell ionization phenomena

Cited by 55 publications

References 38 publications

The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

The evolution of inner-shell multielectronic X-ray spectra from threshold to saturation for low- to high-Z atoms

XAFS Study on the Local Atomic Structures of CeriumOxide Nanoparticles with Surface Coatings

Intrashell Electron-Interaction-Mediated Photoformation of Hollow Atoms near Threshold

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