On the origin of dips in total fluorescence yield X-ray absorption spectra: Partial and inverse partial fluorescence yield at the L-edge of cobalt aqueous solution

2012 ◽  
Vol 546 ◽  
pp. 164-167 ◽  
Author(s):  
Mikhail A. Soldatov ◽  
Kathrin M. Lange ◽  
Malte D. Gotz ◽  
Nicholas Engel ◽  
Ronny Golnak ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectra ◽  
Fluorescence Yield ◽  
X Ray ◽  
Total Fluorescence ◽  
X Ray Absorption

scholarly journals A zone-plate-based two-color spectrometer for indirect X-ray absorption spectroscopy

2019 ◽  
Vol 26 (4) ◽  
pp. 1266-1271 ◽  
Author(s):  
Florian Döring ◽  
Marcel Risch ◽  
Benedikt Rösner ◽  
Martin Beye ◽  
Philipp Busse ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Fresnel Zone ◽  
Decay Channel ◽  
Chemical Properties ◽  
Fluorescence Yield ◽  
Complex Materials ◽  
X Ray ◽  
Total Fluorescence ◽  
X Ray Absorption

X-ray absorption spectroscopy (XAS) is a powerful element-specific technique that allows the study of structural and chemical properties of matter. Often an indirect method is used to access the X-ray absorption (XA). This work demonstrates a new XAS implementation that is based on off-axis transmission Fresnel zone plates to obtain the XA spectrum of La0.6Sr0.4MnO3 by analysis of three emission lines simultaneously at the detector, namely the O 2p–1s, Mn 3s–2p and Mn 3d–2p transitions. This scheme allows the simultaneous measurement of an integrated total fluorescence yield and the partial fluorescence yields (PFY) of the Mn 3s–2p and Mn 3d–2p transitions when scanning the Mn L-edge. In addition to this, the reduction in O fluorescence provides another measure for absorption often referred to as the inverse partial fluorescence yield (IPFY). Among these different methods to measure XA, the Mn 3s PFY and IPFY deviate the least from the true XA spectra due to the negligible influence of selection rules on the decay channel. Other advantages of this new scheme are the potential to strongly increase the efficiency and throughput compared with similar measurements using conventional gratings and to increase the signal-to-noise of the XA spectra as compared with a photodiode. The ability to record undistorted bulk XA spectra at high flux is crucial for future in situ spectroscopy experiments on complex materials.

scholarly journals Solvation and Speciation of Cobalt(II). A Theoretical X-Ray Absorption and RIXS Study

2019 ◽  
Author(s):  
Basmah H. Allehyani ◽  
Walid I. Hassan ◽  
Saadullah Aziz ◽  
Rifaat H. Hilal ◽  
Oliver Kühn ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectra ◽  
Aqua Complex ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Dynamical Correlation ◽  
X Ray ◽  
Spectral Signatures ◽  
Spectroscopic Signatures ◽  
X Ray Absorption

<p>The X-ray spectroscopic signatures of solvated Co<sup>2+</sup> ions mimicking the aqueous solution of CoCl<sub>2</sub> are investigated accounting for multiconfigurational as well as spin-orbit coupling effects. To this end the RASSCF/RASSI methodology with second order corrections due to dynamical correlation (RASPT2) is employed. Emphasis is put on the identification of spectral signatures of different species in octahedral, [Co(H<sub>2</sub>O)<sub>6</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>, and tetrahedral, [Co(H<sub>2</sub>O)<sub>4</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>,coordination. X-ray absorption spectra show distinct differences in the L<sub>3</sub> band only. Here, the best agreement is obtained for the hexa-aqua complex [Co(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup>. For better identification it is proposed to use RIXS spectroscopy, which shows pronounced species-dependent inelastic features.</p><p><br></p>

scholarly journals Solvation and Speciation of Cobalt(II). A Theoretical X-Ray Absorption and RIXS Study

2020 ◽  
Author(s):  
Basmah H. Allehyani ◽  
Walid I. Hassan ◽  
Saadullah Aziz ◽  
Rifaat H. Hilal ◽  
Oliver Kühn ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectra ◽  
Aqua Complex ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Dynamical Correlation ◽  
X Ray ◽  
Spectral Signatures ◽  
Spectroscopic Signatures ◽  
X Ray Absorption

<p>The X-ray spectroscopic signatures of solvated Co<sup>2+</sup> ions mimicking the aqueous solution of CoCl<sub>2</sub> are investigated accounting for multiconfigurational as well as spin-orbit coupling effects. To this end the RASSCF/RASSI methodology with second order corrections due to dynamical correlation (RASPT2) is employed. Emphasis is put on the identification of spectral signatures of different species in octahedral, [Co(H<sub>2</sub>O)<sub>6</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>, and tetrahedral, [Co(H<sub>2</sub>O)<sub>4</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>,coordination. X-ray absorption spectra show distinct differences in the L<sub>3</sub> band only. Here, the best agreement is obtained for the hexa-aqua complex [Co(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup>. For better identification it is proposed to use RIXS spectroscopy, which shows pronounced species-dependent inelastic features.</p><p><br></p>

scholarly journals In situ Measurements of X-ray Absorption Spectra during Transformation of Green Rust to Ferric Oxyhydroxide Via Aqueous Solution

2014 ◽  
Vol 54 (1) ◽  
pp. 125-130 ◽  
Author(s):  
Shun Fujieda ◽  
Aya Yoshino ◽  
Kozo Shinoda ◽  
Yohei Takahashi ◽  
Shigeru Suzuki
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectra ◽  
In Situ Measurements ◽  
Green Rust ◽  
X Ray ◽  
Ferric Oxyhydroxide ◽  
X Ray Absorption

Silicon L2, 3-Edge Xanes Study of Platinum Silicide Thin Films

1996 ◽  
Vol 441 ◽  
Author(s):  
S. J. Naftel ◽  
T. K. Sham ◽  
S. R. Das ◽  
D.-X. Xu
Keyword(s):  
Fluorescence Yield ◽  
Detection Methods ◽  
Sampling Depth ◽  
Total Electron ◽  
Edge Structure ◽  
X Ray ◽  
Platinum Silicide ◽  
Depth Difference ◽  
Total Fluorescence ◽  
X Ray Absorption

AbstractPlatinum silicide films, with a typical thickness of several hundred Å, prepared on n-type Si(100) wafers by UHV mnagnetron sputter deposition followed by rapid thermal annealing, have been studied by Si L2,3-edge X-ray absorption near edge structure (XANES) using both total electron and total fluorescence yield detection. Samples of various annealing times were studied. XANES provides information on the electronic structure and morphology of the samples. By utilizing the sampling depth difference between the two detection methods, we can clearly see XANES data from each layer (eg. surface oxide, silicide) in the sample and can estimate the thickness of the oxide layer.

X-RAY ABSORPTION STUDY OF Mg1-xAlxB2 AT B K-EDGE

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1619-1626 ◽  
Author(s):  
K.-D. TSUEI ◽  
H.-J. LIN ◽  
L.-C. LIN ◽  
T.-Y. HOU ◽  
H.-H. HSIEH ◽  
...  
Keyword(s):  
Room Temperature ◽  
Structural Phase ◽  
Fluorescence Yield ◽  
Absorption Study ◽  
Hole Filling ◽  
Al Doping ◽  
X Ray ◽  
Peak Intensity ◽  
Total Fluorescence ◽  
X Ray Absorption

We have measured B K-edge X-ray absorption spectra of Mg 1-x Al x B 2 (x=0.0 ~ 0.4) using bulk-sensitive total fluorescence yield (TFY) at room temperature and 30 K. In contrast to previous reports no peaks near 192 eV and 194 eV could be observed after repeated scraping, indicating their origin being due to surface contamination. These clean spectra show a peak right above the absorption threshold, anticipated from transition to the unoccupied B 2p states. Except in the intermediate Al doping range of x ~ 0.1 to 0.28 the threshold peak intensity decreases, consistent with pσ-hole filling. The increase of peak intensity in the intermediate range is correlated with structural phase transition.

scholarly journals Solvation and Speciation of Cobalt(II). A Theoretical X-Ray Absorption and RIXS Study

2020 ◽  
Author(s):  
Basmah H. Allehyani ◽  
Walid I. Hassan ◽  
Saadullah Aziz ◽  
Rifaat H. Hilal ◽  
Oliver Kühn ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectra ◽  
Aqua Complex ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Dynamical Correlation ◽  
X Ray ◽  
Spectral Signatures ◽  
Spectroscopic Signatures ◽  
X Ray Absorption

<p>The X-ray spectroscopic signatures of solvated Co<sup>2+</sup> ions mimicking the aqueous solution of CoCl<sub>2</sub> are investigated accounting for multiconfigurational as well as spin-orbit coupling effects. To this end the RASSCF/RASSI methodology with second order corrections due to dynamical correlation (RASPT2) is employed. Emphasis is put on the identification of spectral signatures of different species in octahedral, [Co(H<sub>2</sub>O)<sub>6</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>, and tetrahedral, [Co(H<sub>2</sub>O)<sub>4</sub><sub>-</sub><sub>x</sub>Cl<sub>x</sub>]<sup>(2</sup><sup>-</sup><sup>x)+</sup>,coordination. X-ray absorption spectra show distinct differences in the L<sub>3</sub> band only. Here, the best agreement is obtained for the hexa-aqua complex [Co(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup>. For better identification it is proposed to use RIXS spectroscopy, which shows pronounced species-dependent inelastic features.</p><p><br></p>

Sign in / Sign up

Export Citation Format

Share Document