SelfAbsorption Correction Strategy for FluorescenceYield Soft Xray Near Edge Spectra

Carboni, R.; Giovannini, S.; Antonioli, G.; Boscherini, Federico

doi:10.1238/physica.topical.115a00986

Cited by 32 publications

(21 citation statements)

References 3 publications

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“…This means that the detected signal in terms of core hole decay events is directly proportional to the absorption coefficient µ(ω). If, on the other hand, the layer from which the secondary process is detected is rather thick, going beyond the linear regime, we could have saturation effects where the spectral intensities of the most intense features are suppressed (45)(46)(47). In the nonradiative process the core hole decays via the Auger process, giving rise to a high-kinetic energy Auger-electron which is detected via an energy dispersive electron analyzer to yield the AEY signal.…”

Section: Ii1 Detection Methods Of X-ray Absorption Spectroscopymentioning

confidence: 99%

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

Nilsson

Nordlund

Waluyo

et al. 2010

Journal of Electron Spectroscopy and Related Phenomena

176

290

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Here we present a review of x-ray absorption spectroscopy and x-ray Raman scattering with the perspective to understand the spectra of water including changes with temperature, mass of the water molecule and presence of monovalent ions. The different detection schemes are discussed and it is concluded that transmission x-ray absorption measurements, using a small area where the thickness is uniform, and x-ray Raman scattering give the most reliable spectra. Different model systems are discussed such as the surface and bulk of ice and various adsorbed monolayer structures on metal surfaces.

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Section: Ii1 Detection Methods Of X-ray Absorption Spectroscopymentioning

confidence: 99%

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

Nilsson

Nordlund

Waluyo

et al. 2010

Journal of Electron Spectroscopy and Related Phenomena

176

290

View full text Add to dashboard Cite

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“…23 The Journal of Physical Chemistry C Algorithms can be used to correct the fluorescence spectra; however, these procedures are not always reliable. 62,83 For this reason, the Gd L 3 -edge GA-XANES spectra will not be discussed further.…”

Section: Ti K-edge Ga-exafsmentioning

confidence: 99%

Investigation of the Structural Stability of Ion-Implanted Gd₂Ti_2–xSn_xO₇ Pyrochlore-Type Oxides by Glancing Angle X-ray Absorption Spectroscopy

et al. 2014

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Rare-earth titanate and stannate pyrochlore-type oxides have been investigated in the past for the sequestration of nuclear waste elements because of their resistance to radiation-induced structural damage. In order to enhance this property, it is necessary to understand the effect of radioactive decay of the incorporated actinide elements on the local chemical environment. In this study, Gd 2 Ti 2−x Sn x O 7 materials have been implanted with Au − ions to simulate radiation-induced structural damage. Glancing angle X-ray absorption near-edge spectroscopy (GA-XANES), glancing angle X-ray absorption fine structure (GA-EXAFS) analysis, and powder X-ray diffraction have been used to investigate changes in the local coordination environment of the metal atoms in the damaged surface layer. Examination of GA-XANES/EXAFS spectra from the implanted Gd 2 Ti 2−x Sn x O 7 materials collected at various glancing angles allowed for an investigation of how the local coordination environment around the absorbing atoms changed at different depths in the damaged surface layer. This study has shown the usefulness of GA-XANES to the examination of ion-implanted materials and has suggested that Gd 2 Ti 2−x Sn x O 7 becomes more susceptible to ion-beam-induced structural damage with increasing Sn concentration.

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“…57 (1.2 eV resolution) The effect of self-absorption, typically important close to absorption edges, was calculated as described by Carboni et al 58 , but was not significant here. In order to complete the construction of the absorption coefficients, the curves were then scaled to match the tabulated values for X-ray absorption in Nd 2 CuO 4 above and below the Cu K-edge and following Ref.…”

Section: Appendix A: Rixs Normalization With a Fluorescence Monitormentioning

confidence: 99%

Polarization dependence and symmetry analysis in indirectK-edge RIXS

et al. 2010

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We present a study of the charge-transfer excitations in undoped Nd 2 CuO 4 using resonant inelastic X-ray scattering (RIXS) at the Cu K-edge. At the Brillouin zone center, azimuthal scans that rotate the incidentphoton polarization within the CuO 2 planes reveal weak fourfold oscillations. A comparison of spectra taken in different Brillouin zones reveals a spectral weight decrease at high energy loss from forward-to back-scattering. We show that these are scattered-photon polarization effects related to the properties of the observed electronic excitations. Each of the two effects constitutes about 10% of the inelastic signal while the '4p-as-spectator' approximation describes the remaining 80%. Raman selection rules can accurately model our data, and we conclude that the observed polarization-dependent RIXS features correspond to E g and B 1g charge-transfer excitations to non-bonding oxygen 2p bands, above 2.5 eV energy-loss, and to an E g d → d excitation at 1.65 eV.Raman scattering and optical spectroscopy have enabled tremendous contributions to the study of condensed matter systems. Both probes use ∼ 1 eV light and are limited to essentially zero momentum transfer. In order to investigate the charge response of a material throughout the Brillouin zone, photons in the X-ray regime must be used. X-ray Raman scattering, more commonly referred to as resonant inelastic X-ray scattering (RIXS), allows the measurement of the momentum dependence of charge excitations. Even though it has successfully been used to study the physics of a wide array of systems, 1-5 this resonant technique is relatively new and there is still much to learn about the details of its cross section.One of the strengths of conventional Raman scattering derives from the fact that the technique allows the determination of the symmetry of excitations by selecting the polarization of the incident and scattered photons. Only polarization dependent soft (or direct 6 ) X-ray RIXS studies, at the O K-edge or the Cu L-and M-edges of the cuprates, 7-11 have shown that photon polarization can be used to select different electronic excitations. In these cases, the photon polarization effects are understood to come from the direct interaction of the photoelectron, excited into the valence system, with the valence electrons. This is why this type of RIXS is commonly referred to as direct. 6 On the other hand, tuning the incident energy to the Cu K-edge excites the photoelectron into the Cu 4p band approximately 10-20 eV above the 3d valence levels. The relatively large separation in energy from the valence levels as well as the large spatial extent of the 4p orbital are believed to prevent the photoelectron from interacting with the valence system, and this type of RIXS is in turn referred to as indirect. 6 Accordingly, theoretical models of this type of RIXS accordingly do not include possible interactions of the 4p photoelectron with the valence system, 12-15 which is commonly referred to as the '4p-as-spectator' approximation.RIXS investigations of ...

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SelfAbsorption Correction Strategy for FluorescenceYield Soft Xray Near Edge Spectra

Cited by 32 publications

References 3 publications

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

Investigation of the Structural Stability of Ion-Implanted Gd₂Ti_2–xSn_xO₇ Pyrochlore-Type Oxides by Glancing Angle X-ray Absorption Spectroscopy

Polarization dependence and symmetry analysis in indirectK-edge RIXS

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SelfAbsorption Correction Strategy for FluorescenceYield Soft Xray Near Edge Spectra

Cited by 32 publications

References 3 publications

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

X-ray absorption spectroscopy and X-ray Raman scattering of water and ice; an experimental view

Investigation of the Structural Stability of Ion-Implanted Gd2Ti2–xSnxO7 Pyrochlore-Type Oxides by Glancing Angle X-ray Absorption Spectroscopy

Polarization dependence and symmetry analysis in indirectK-edge RIXS

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Investigation of the Structural Stability of Ion-Implanted Gd₂Ti_2–xSn_xO₇ Pyrochlore-Type Oxides by Glancing Angle X-ray Absorption Spectroscopy