Combine Spectroscopic Ellipsometry and Grazing X-ray Reflectance for Fine Characterization of Complex Epitaxial Structures

1995 ◽  
Vol 405 ◽  
Author(s):  
P. Boher ◽  
J. L. Stehle
Keyword(s):  
Complex Systems ◽  
Spectroscopic Ellipsometry ◽  
Fourier Transformation ◽  
Structural Information ◽  
Multilayer Mirrors ◽  
Reflectance Curve ◽  
X Ray

AbstractSpectroscopic Ellipsometry (SE) and Grazing X-ray Reflectance (GXR) techniques are applied on different III-V epitaxial structures in order to extract accurately their structural information. Thickness information are obtained directly from Fourier transformation of the GXR spectra and confirmed by simulation of the reflectance curve. Compositions are deduced from SE regression using GXR thickness as input values. Examples on monolayer and bilayer structures are first remembered. Then the potentiality of the method is demonstrated to more complex systems (multilayer mirrors and HEMT structures).

Combine spectroscopic ellipsometry and grazing x-ray reflectance for fine characterization of complex epitaxial structures

1995 ◽  
Vol 406 ◽  
Author(s):  
P. Boher ◽  
J. L. Stehle
Keyword(s):  
Complex Systems ◽  
Spectroscopic Ellipsometry ◽  
Fourier Transformation ◽  
Structural Information ◽  
Multilayer Mirrors ◽  
Reflectance Curve ◽  
X Ray

AbstractMSpectroscopic Ellipsometry (SE) and Grazing X-ray Reflectance (GXR) techniques are applied on different III-V epitaxial structures in order to extract accurately their structural information. Thickness information are obtained directly from Fourier transformation of the GXR spectra and confirmed by simulation of the reflectance curve. Compositions are deduced from SE regression using GXR thickness as input values. Examples on monolayer and bilayer structures are first remembered. Then the potentiality of the method is demonstrated to more complex systems (multilayer mirrors and HEMT structures).

scholarly journals Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization

2019 ◽  
Vol 1 (7) ◽  
pp. 2546-2552 ◽  
Author(s):  
George F. Tierney ◽  
Donato Decarolis ◽  
Norli Abdullah ◽  
Scott M. Rogers ◽  
Shusaku Hayama ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Structural Characterization ◽  
Structural Information ◽  
Particle Growth ◽  
Au Nanoparticle ◽  
X Ray ◽  
Colloidal Au ◽  
X Ray Absorption ◽  
Au Colloids

This paper describes the structural characterization of ultra-dilute colloidal Au nanoparticle solutions using X-ray absorption spectroscopy (XAS) and the particle growth during immobilization.

Combined characterization of conductive materials by infrared spectroscopic ellipsometry and grazing X-ray reflectance

1998 ◽  
Vol 319 (1-2) ◽  
pp. 67-72 ◽  
Author(s):  
Pierre Boher ◽  
Michel Luttmann ◽  
Jean Louis Stehle ◽  
Louis Hennet
Keyword(s):  
Spectroscopic Ellipsometry ◽  
X Ray ◽  
Conductive Materials ◽  
Infrared Spectroscopic

scholarly journals Crystallization and preliminary X-ray characterization of the eukaryotic replication terminator Reb1–Ter DNA complex

2015 ◽  
Vol 71 (4) ◽  
pp. 414-418 ◽  
Author(s):  
Rahul Jaiswal ◽  
Samarendra K. Singh ◽  
Deepak Bastia ◽  
Carlos R. Escalante
Keyword(s):  
Replication Fork ◽  
Structural Information ◽  
Transcription Termination ◽  
Replication Forks ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Naturally Occurring ◽  
Dna Complex

The Reb1 protein fromSchizosaccharomyces pombeis a member of a family of proteins that control programmed replication termination and/or transcription termination in eukaryotic cells. These events occur at naturally occurring replication fork barriers (RFBs), where Reb1 binds to termination (Ter) DNA sites and coordinates the polar arrest of replication forks and transcription approaching in opposite directions. The Reb1 DNA-binding and replication-termination domain was expressed inEscherichia coli, purified and crystallized in complex with a 26-mer DNA Ter site. Batch crystallization under oil was required to produce crystals of good quality for data collection. Crystals grew in space groupP21, with unit-cell parametersa= 68.9,b= 162.9,c= 71.1 Å, β = 94.7°. The crystals diffracted to a resolution of 3.0 Å. The crystals were mosaic and required two or three cycles of annealing. This study is the first to yield structural information about this important family of proteins and will provide insights into the mechanism of replication and transcription termination.

Characterization of Mo/B 4 C soft x-ray multilayer mirrors for 7.3- to 8.0-nm radiation

1998 ◽  
Author(s):  
Junxia Lu ◽  
Yueying Ma ◽  
Shu Pei ◽  
Jianlin Cao ◽  
Xingdan Chen
Keyword(s):  
Multilayer Mirrors ◽  
X Ray

Characterization of Lead Zirconate Titanate Powders Prepared by a Hydrothermal Method

2005 ◽  
Vol 902 ◽  
Author(s):  
Lingjuan Che ◽  
Yongping Ding ◽  
Jinrong Cheng ◽  
Chao Chen ◽  
Zhongyan Meng
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Method ◽  
Lead Zirconate Titanate ◽  
Fourier Transformation ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zirconate Titanate ◽  
Scanning Electron

AbstractLead Zirconate Titanate (PZT) powders have been synthesized by a hydrothermal method at the processing temperatures of 120-220 °C for 1.5-50 hours, based on the reaction of Pb(CH3COOH)2·3H2O, ZrOCl2·8H2O, Ti(C4H9O)4 and KOH. Hydrothermally treated PZT powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transformation infrared (FTIR) techniques respectively. The influences of hydrothermal synthesize conditions on the crystalline structure and the morphology of PZT particles were investigated. Crystallized PZT powders could be synthesized at the KOH concentration of >2.5 mol/l.

Defect structure and chemistry of (Ca x Sr 1-x ) n+1 Ti n 0 3n+1 layer perovskites

1991 ◽  
Vol 336 (1644) ◽  
pp. 541-569 ◽  
Keyword(s):  
Neutron Diffraction ◽  
Alkaline Earth ◽  
Structural Information ◽  
High Resolution Electron Microscopy ◽  
Oxide Superconductors ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Resolution Electron ◽  
The Stability

The Ruddlesden-Popper structural family is constructed from ordered intergrowths of rocksalt type (AX) layers with perovskite (ABX 3 ) blocks of varying widths, yielding phases with the general formula n ABX 3 AX where 1 < n < ∞ In this article, the characterization of (Ca x Sr 1-x ) n+1 Ti n O 3n+1 layer perovskites by powder X-ray and neutron diffraction and high resolution electron microscopy is described. These phases undergo a phase transition from tetragonal to orthorhombic symmetry at x = 0.65. Structure solutions of neutron diffraction data are presented for the end-member phases Sr 3 Ti 2 O 7 (I4/mmm), Ca 3 Ti 2 O 7 (Ccm2 1 ) and Ca 4 Ti 3 O 10 (Pcab). Refinement of the mixed alkaline earth preparation (Ca 0.85 Sr 0.15 ) 4 Ti 3 O 10 showed that Sr partitioned preferentially to the perovskite blocks rather than the rocksalt layers. Ordered and disordered intergrowths of rocksalt layers were found on the{101} orth = {100} tet perovskite planes with extensive disorder most prevalent in samples annealed for short periods (less than 24 hours). Evidence is presented for the existence of V"A and V"," point defects in the intermediate structures that precede the formation of ordered layer sequences. These data are discussed in terms of existing thermodynamic and structural information. For generalized Ruddlesden Popper phases the relation between chemistry and symmetry is reviewed and factors contributing to the stability of different n -members enunciated. For completeness, the (Ca x Sr 1-x ) n+1 Ti n O 3n+1 perovskites are considered as the structural prototypes of the oxide superconductors being a subset of an extended n ABX 3 mAX Ruddlesden-Popper family.

scholarly journals Structure of Carbon Materials Explored by Local Transmission Electron Microscopy and Global Powder Diffraction Probes

2018 ◽  
Vol 4 (4) ◽  
pp. 68 ◽  
Author(s):  
Karolina Jurkiewicz ◽  
Mirosława Pawlyta ◽  
Andrzej Burian
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Neutron Diffraction ◽  
Carbon Materials ◽  
Structural Information ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Local Transmission

Transmission electron microscopy and neutron or X-ray diffraction are powerful techniques available today for characterization of the structure of various carbon materials at nano and atomic levels. They provide complementary information but each one has advantages and limitations. Powder X-ray or neutron diffraction measurements provide structural information representative for the whole volume of a material under probe but features of singular nano-objects cannot be identified. Transmission electron microscopy, in turn, is able to probe single nanoscale objects. In this review, it is demonstrated how transmission electron microscopy and powder X-ray and neutron diffraction methods complement each other by providing consistent structural models for different types of carbons such as carbon blacks, glass-like carbons, graphene, nanotubes, nanodiamonds, and nanoonions.

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