Multiple Core and Vibronic Coupling Effects in Attosecond Stimulated X-Ray Raman Spectroscopy

AbstractSEM–EDX and Raman spectroscopy analysis of radioactive compounds is often restricted to dedicated instrumentation, within radiological working areas, to manage the hazard and risk of contamination. Here, we demonstrate application of WetSEM® capsules for containment of technetium powder materials, enabling routine multimodal characterisation with general user instrumentation, outside of a controlled radiological working area. The electron transparent membrane of WetSEM® capsules enables SEM imaging of submicron non-conducting technetium powders and acquisition of Tc Lα X-ray emission, using a low cost desktop SEM–EDX system, as well as acquisition of good quality μ-Raman spectra using a 532 nm laser.

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On the generation of electronic ring currents under vibronic coupling effects

The Journal of Chemical Physics ◽

10.1063/5.0031389 ◽

2020 ◽

Vol 153 (22) ◽

pp. 224308

Author(s):

Krishna Reddy Nandipati ◽

Oriol Vendrell

Keyword(s):

Vibronic Coupling ◽

Coupling Effects ◽

Ring Currents

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Structural and Raman Vibrational Studies ofCeO2-Bi2O3Oxide System

Advances in Materials Science and Engineering ◽

10.1155/2009/502437 ◽

2009 ◽

Vol 2009 ◽

pp. 1-4 ◽

Cited By ~ 8

Author(s):

L. Bourja ◽

B. Bakiz ◽

A. Benlhachemi ◽

M. Ezahri ◽

J. C. Valmalette ◽

...

Keyword(s):

Solid Solution ◽

Raman Spectroscopy ◽

Phase Changes ◽

Phase System ◽

X Ray Diffraction ◽

X Ray ◽

Vibrational Studies ◽

Coprecipitation Route

A series of ceramics samples belonging to theCeO2-Bi2O3phase system have been prepared via a coprecipitation route. The crystallized phases were obtained by heating the solid precursors at600∘Cfor 6 hours, then quenching the samples. X-ray diffraction analyses show that forx<0.20a solid solutionCe1−xBixO2−x/2with fluorine structure is formed. For x ranging between 0.25 and 0.7, a tetragonalβ′phase coexisting with the FCC solid solution is observed. For x ranging between 0.8 and 0.9, a new tetragonalβphase appears. Theβ′phase is postulated to be a superstructure of theβphase. Finally, close tox=1, the classical monoclinicα Bi2O3structure is observed. Raman spectroscopy confirms the existence of the phase changes as x varies between 0 and 1.

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Plasma Fabrication and SERS Functionality of Gold Crowned Silicon Submicrometer Pillars

Materials ◽

10.3390/ma13051244 ◽

2020 ◽

Vol 13 (5) ◽

pp. 1244 ◽

Cited By ~ 1

Author(s):

Paola Pellacani ◽

Carlo Morasso ◽

Silvia Picciolini ◽

Dario Gallach ◽

Lucia Fornasari ◽

...

Keyword(s):

Raman Spectroscopy ◽

Surface Enhanced Raman Spectroscopy ◽

Post Processing ◽

Advanced Material ◽

X Ray ◽

Colloidal Monolayer ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Lift Off ◽

X Ray Absorption

Sequential plasma processes combined with specific lithographic methods allow for the fabrication of advanced material structures. In the present work, we used self-assembled colloidal monolayers as lithographic structures for the conformation of ordered Si submicrometer pillars by reactive ion etching. We explored different discharge conditions to optimize the Si pillar geometry. Selected structures were further decorated with gold by conventional sputtering, prior to colloidal monolayer lift-off. The resulting structures consist of a gold crown, that is, a cylindrical coating on the edge of the Si pillar and a cavity on top. We analysed the Au structures in terms of electronic properties by using X-ray absorption spectroscopy (XAS) prior to and after post-processing with thermal annealing at 300 °C and/or interaction with a gold etchant solution (KI). The angular dependent analysis of the plasmonic properties was studied with Fourier transformed UV-vis measurements. Certain conditions were selected to perform a surface enhanced Raman spectroscopy (SERS) evaluation of these platforms with two model dyes, prior to confirming the potential interest for a well-resolved analysis of filtered blood plasma.

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