scholarly journals X-ray absorption linear dichroism at the Ti K edge of anatase TiO2 single crystals

2019 ◽  
Vol 100 (24) ◽  
Author(s):  
T. C. Rossi ◽  
D. Grolimund ◽  
M. Nachtegaal ◽  
O. Cannelli ◽  
G. F. Mancini ◽  
...  
Keyword(s):  
Single Crystals ◽  
Linear Dichroism ◽  
Anatase Tio2 ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Anisotropy of X-ray Absorption Cross Section in CeCoGe3 Single Crystal

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 544
Author(s):  
Andrei Rogalev ◽  
Fabrice Wilhelm ◽  
Elena Ovchinnikova ◽  
Aydar Enikeev ◽  
Roman Bakonin ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Linear Dichroism ◽  
X Rays ◽  
Absorption Cross ◽  
X Ray ◽  
Measured Absorption ◽  
Linearly Polarized ◽  
X Ray Absorption ◽  
Absorption Edges

Absorption spectra of two orthogonal linearly polarized x-rays in a single CeCoGe3 crystal were measured at the ID12 beamline of the ESRF for the energies near the K-edges of Ge, Co and near the L23 edges of Ce. The X-ray natural linear dichroism (XNLD) was revealed in the vicinity of all the absorption edges, which indicates a splitting of electronic states in a crystalline field. Mathematical modelling in comparison with experimental data allowed the isotropic and anisotropic parts of atomic absorption cross section in CeCoGe3 to be determined near all measured absorption edges. The calculations also show that the “average” anisotropy of the cross section close to the Ge K-edge revealed in the experiment is less than the partial anisotropic contributions corresponding to Ge atoms in two different Wyckoff positions.

A single crystal, linearly polarized Fe 2p X-ray absorption study of gillespite

1998 ◽  
Vol 62 (1) ◽  
pp. 65-75 ◽  
Author(s):  
P. F. Schofield ◽  
G. van der Laan ◽  
C. M. B. Henderson ◽  
G. Cressey
Keyword(s):  
Single Crystal ◽  
Ground State ◽  
Branching Ratio ◽  
Linear Dichroism ◽  
Electronic Charge ◽  
Magic Angle ◽  
X Rays ◽  
X Ray ◽  
Peak Structure ◽  
X Ray Absorption

AbstractThe Fe 2p X-ray absorption spectra of single crystal gillespite, BaFeSi4O10, show a strong linear dichroism, i.e. a large difference in the absorption when measured with the polarization of the X-rays either parallel or perpendicular to the plane of the FeO4 group. The isotropic spectrum, obtained from measurement at the ‘magic angle’, and the polarization dependent spectra have been compared to atomic multiplet calculations and show an excellent agreement with theory. Analysis of the branching ratio, the linear dichroism, and the detailed peak structure confirms that the 5A1 level is the ground state at room temperature and pressure. The 5B2 level is sufficiently low in energy that a distortion of the electronic charge density, induced by increased pressure, may result in a 5B2 ground state.

Near Edge X-Ray Absorption Fine Structure (NEXAFS) Microscopy: Chemical Analysis at Sub Visible Spatial Resolution

1997 ◽  
Vol 3 (S2) ◽  
pp. 851-852
Author(s):  
H. Ade
Keyword(s):  
Fine Structure ◽  
Compositional Analysis ◽  
High Sensitivity ◽  
Linear Dichroism ◽  
X Rays ◽  
X Ray ◽  
Absorption Fine ◽  
Nexafs Spectroscopy ◽  
Wide Range ◽  
X Ray Absorption

Infrared, Raman, and fluorescence/luminescence microspectroscopy/microscopy in many instances seek to provide high sensitivity compositional and functional information that goes beyond mere elemental composition. This goal is shared by NEXAFS microscopy, in which Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy is employed to provide chemical sensitivity and can be relatively easily adopted in a scanning transmission x-ray microscope (STXM). In addition to compositional information, NEXAFS microscopy can exploit the dependence of x-ray absorption resonances on the bond orientation relative to the linearly polarized x rays (linear dichroism microscopy). For compositional analysis, NEXAFS microscopy is analogous to Electron Energy Loss Spectroscopy (EELS) in an electron microscope. However, when utilizing near edge spectral features, NEXAFS microscopy requires a considerable lower dose than EELS microscopy which makes it very suitable to studying radiation sensitive materials such as polymers. NEXAFS has shown to have excellent sensitivity to a wide range of moieties in polymers, including sensitivity to substitution isomerism.

Alloying effects on x-ray absorption edges in nickel-platinum single crystals

1993 ◽  
Vol 97 (17) ◽  
pp. 4288-4292 ◽  
Author(s):  
B. Moraweck ◽  
A. J. Renouprez ◽  
E. K. Hlil ◽  
R. Baudoing-Savois
Keyword(s):  
Single Crystals ◽  
X Ray ◽  
Alloying Effects ◽  
Nickel Platinum ◽  
X Ray Absorption ◽  
Platinum Single Crystals ◽  
Absorption Edges

scholarly journals Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex

2020 ◽  
Vol 11 (31) ◽  
pp. 8306-8311
Author(s):  
Dmitri Mitcov ◽  
Mikhail Platunov ◽  
Christian D. Buch ◽  
Anders Reinholdt ◽  
Anders R. Døssing ◽  
...  
Keyword(s):  
Single Crystals ◽  
Opposite Sign ◽  
X Ray ◽  
First Time ◽  
X Ray Absorption ◽  
Absorption Measurements

Magnetochiral Dichroism of chiral mononuclear lanthanoid complexes is for the first time detected by X-ray absorption measurements on single crystals of Holmium oxydiacetate, at the Ho L3-edge. The effect is of opposite sign for the two enantiomers.

STUDY OF COMPLEX Cu-O LATTICE IN La8-xSrxCu8O20 BY HIGH RESOLUTION X-RAY ABSORPTION SPECTROSCOPY

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3656-3661 ◽  
Author(s):  
N. L. SAINI ◽  
A. LANZARA ◽  
K. B. GARG ◽  
A. BIANCONI ◽  
T. ITO ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Absorption Spectroscopy ◽  
Local Structure ◽  
Three Dimensional ◽  
Xanes Spectroscopy ◽  
High Quality ◽  
X Ray ◽  
X Ray Absorption

Cu K-edge XANES spectroscopy has been used to study local structure around the Cu-site in three-dimensional oxygen deficient perovkite La 8- x Sr x Cu 8 O 20 system. The combination of E//ab and E//c polarization and high resolution XANES spectra on high quality single crystals has allowed us to distinguish the various features associated with the complex Cu-O networks in the system which have then been compared with those of the La 2- x Sr x CuO 4 system.

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