Study of High-Pressure Reaction Paths of C:C Bonds and Aromatic Rings Opening by X-ray Absorption Near-Edge Structure and Raman Scattering

1995 ◽  
Vol 99 (35) ◽  
pp. 13109-13114 ◽  
Author(s):  
F. Cansell ◽  
D. Fabre ◽  
J. P. Petitet ◽  
J. P. Itie ◽  
A. Fontaine
Keyword(s):  
High Pressure ◽  
Raman Scattering ◽  
Aromatic Rings ◽  
Reaction Paths ◽  
Edge Structure ◽  
X Ray ◽  
High Pressure Reaction ◽  
X Ray Absorption

Chemical and orientational imaging of polymeric samples

1994 ◽  
Vol 52 ◽  
pp. 68-69
Author(s):  
H. Ade ◽  
B. Hsiao ◽  
G. Mitchell ◽  
E. Rightor ◽  
A. P. Smith ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
National Laboratory ◽  
Brookhaven National Laboratory ◽  
Carbonyl Groups ◽  
Aromatic Rings ◽  
Edge Structure ◽  
X Ray ◽  
Scanning Transmission ◽  
Polymeric Samples ◽  
X Ray Absorption

We have used the Scanning Transmission X-ray Microscope at beamline X1A (X1-STXM) at Brookhaven National Laboratory (BNL) to acquire high resolution, chemical and orientation sensitive images of polymeric samples as well as point spectra from 0.1 μm areas. This sensitivity is achieved by exploiting the X-ray Absorption Near Edge Structure (XANES) of the carbon K edge. One of the most illustrative example of the chemical sensitivity achievable is provided by images of a polycarbonate/pol(ethylene terephthalate) (70/30 PC/PET) blend. Contrast reversal at high overall contrast is observed between images acquired at 285.36 and 285.69 eV (Fig. 1). Contrast in these images is achieved by exploring subtle differences between resonances associated with the π bonds (sp hybridization) of the aromatic groups of each polymer. PET has a split peak associated with these aromatic groups, due to the proximity of its carbonyl groups to its aromatic rings, whereas PC has only a single peak.

Design and operation of a high pressure reaction cell for in situ X-ray absorption spectroscopy

2007 ◽  
Vol 126 (1-2) ◽  
pp. 18-26 ◽  
Author(s):  
Simon R. Bare ◽  
Ning Yang ◽  
Shelly D. Kelly ◽  
George E. Mickelson ◽  
Frank S. Modica
Keyword(s):  
High Pressure ◽  
Absorption Spectroscopy ◽  
Reaction Cell ◽  
X Ray ◽  
High Pressure Reaction ◽  
X Ray Absorption

Design and Operation of an In Situ High Pressure Reaction Cell for X-Ray Absorption Spectroscopy

2007 ◽  
Author(s):  
Simon R. Bare ◽  
N. Yang ◽  
S. D. Kelly ◽  
G. E. Mickelson ◽  
F. S. Modica
Keyword(s):  
High Pressure ◽  
Absorption Spectroscopy ◽  
Reaction Cell ◽  
X Ray ◽  
High Pressure Reaction ◽  
X Ray Absorption

A microsecond time resolved x-ray absorption near edge structure synchrotron study of phase transitions in Fe undergoing ramp heating at high pressure

2014 ◽  
Vol 115 (9) ◽  
pp. 093513 ◽  
Author(s):  
C. Marini ◽  
F. Occelli ◽  
O. Mathon ◽  
R. Torchio ◽  
V. Recoules ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Time Resolved ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

scholarly journals High pressure polymorphism of β-TaON

2014 ◽  
Vol 43 (25) ◽  
pp. 9647-9654 ◽  
Author(s):  
K. Woodhead ◽  
S. Pascarelli ◽  
A. L. Hector ◽  
R. Briggs ◽  
N. Alderman ◽  
...  
Keyword(s):  
High Pressure ◽  
Raman Scattering ◽  
Ambient Temperature ◽  
Structural Transformation ◽  
Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pressure Behavior ◽  
Diamond Anvil ◽  
X Ray Absorption

The high pressure behavior of TaON was studied using a combination of Raman scattering, synchrotron X-ray diffraction, and X-ray absorption spectroscopy in diamond anvil cells to 70 GPa at ambient temperature to reveal evidence for a new structural transformation near 30 GPa.

scholarly journals Local lattice distortions and dynamics in extremely overdoped superconducting YSr2Cu2.75Mo0.25O7.54

2020 ◽  
Vol 117 (9) ◽  
pp. 4559-4564 ◽  
Author(s):  
Steven D. Conradson ◽  
Theodore H. Geballe ◽  
Andrea Gauzzi ◽  
Maarit Karppinen ◽  
Changqing Jin ◽  
...  
Keyword(s):  
High Pressure ◽  
Second Phase ◽  
Edge Structure ◽  
X Ray ◽  
Site Distribution ◽  
Pressure Oxygen ◽  
Local Lattice ◽  
High Pressure Oxygen ◽  
Liquid States ◽  
X Ray Absorption

A common characteristic of many “overdoped” cuprates prepared with high-pressure oxygen isTcvalues ≥ 50 K that often exceed that of optimally doped parent compounds, despite O stoichiometries that place the materials at the edge or outside of the conventional boundary between superconducting and normal Fermi liquid states. X-ray absorption fine-structure (XAFS) measurements at 52 K on samples of high-pressure oxygen (HPO) YSr2Cu2.75Mo0.25O7.54,Tc= 84 K show that the Mo is in the (VI) valence in an unusually undistorted octahedral geometry with predominantly Mo neighbors that is consistent with its assigned substitution for Cu in the chain sites of the structure. Perturbations of the Cu environments are minimal, although the Cu X-ray absorption near-edge structure (XANES) differs from that in other cuprates. The primary deviation from the crystal structure is therefore nanophase separation into Mo- and Cu-enriched domains. There are, however, indications that the dynamical attributes of the structure are altered relative to YBa2Cu3O7, including a shift of the Cu-apical O two-site distribution from the chain to the plane Cu sites. Another effect that would influenceTcis the possibility of multiple bands at the Fermi surface caused by the presence of the second phase and the lowering of the Fermi level.

Raman scattering and x-ray-absorption spectroscopy in gallium nitride under high pressure

1992 ◽  
Vol 45 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Piotr Perlin ◽  
Claude Jauberthie-Carillon ◽  
Jean Paul Itie ◽  
Alfonso San Miguel ◽  
Izabella Grzegory ◽  
...  
Keyword(s):  
High Pressure ◽  
Gallium Nitride ◽  
Raman Scattering ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

Full-Field Calcium K-Edge X-ray Absorption Near-Edge Structure Spectroscopy on Cortical Bone at the Micron-Scale: Polarization Effects Reveal Mineral Orientation

2016 ◽  
Vol 88 (7) ◽  
pp. 3826-3835 ◽  
Author(s):  
Bernhard Hesse ◽  
Murielle Salome ◽  
Hiram Castillo-Michel ◽  
Marine Cotte ◽  
Barbara Fayard ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Edge Structure ◽  
Full Field ◽  
Polarization Effects ◽  
X Ray ◽  
X Ray Absorption
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