scholarly journals Crystallographic Analysis with Anomalous Dispersion Effects of Phosphorus Atoms Using Remote and Automated Measurements

2021 ◽  
Vol 63 (3) ◽  
pp. 222-223
Author(s):  
Masahiro FUJIHASHI
Keyword(s):  
Crystallographic Analysis ◽  
Anomalous Dispersion ◽  
Dispersion Effects ◽  
Automated Measurements

Anomalous Dispersion Effects in Diffuse Reflectance Infrared Fourier Transform Spectroscopy: A Study of Optical Geometries

1989 ◽  
Vol 43 (2) ◽  
pp. 267-274 ◽  
Author(s):  
D. M. Hembree ◽  
H. R. Smyrl
Keyword(s):  
Fourier Transform ◽  
Diffuse Reflectance ◽  
Specular Reflection ◽  
Fourier Transform Spectroscopy ◽  
Anomalous Dispersion ◽  
Fresnel Reflection ◽  
Absorption Bands ◽  
Dispersion Effects ◽  
Diffuse Reflectance Infrared ◽  
Reflectance Measurements

In this report, the two most common diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) optical geometries (on-axis and off-axis) are investigated in terms of adherence to the Kubelka-Munk theory. It was found that specular reflection, whether in the form of regular Fresnel reflection or diffuse Fresnel reflection, is the major cause of spectral distortion in typical diffuse reflectance measurements. A discussion of the origin of the variation in specular background associated with resonances is presented. Once the adverse effects of specular reflection are minimized, the linear relationship between response and concentration predicted by Kubelka-Munk theory was found to extend to concentrated samples. Up to a point, this was the case even for intense absorption bands where anomalous dispersion leads to large changes in specular intensity.

Anomalous dispersion effects, thermal vibrations and bonding charges in gallium arsenide

1987 ◽  
Vol 65 (3) ◽  
pp. 299-304 ◽  
Author(s):  
D. Pathinettam Padiyan ◽  
S. K. Mohanlal ◽  
K. S. Chandrasekaran
Keyword(s):  
Gallium Arsenide ◽  
Anomalous Dispersion ◽  
Dispersion Effects ◽  
Thermal Vibrations

Anomalous dispersion effects in the calculation of electron density

1972 ◽  
Vol 28 (1) ◽  
pp. 65-69
Author(s):  
A. Del Pra ◽  
M. Mammi ◽  
G. Ferraris
Keyword(s):  
Electron Density ◽  
Anomalous Dispersion ◽  
Dispersion Effects

Anomalous Dispersion Corrections to Surface and Interface Exafs Measurements Made Using Glancing Angles

1986 ◽  
Vol 77 ◽  
Author(s):  
Huaiyu Chen ◽  
Steve M. Heald ◽  
John M. Tranquada
Keyword(s):  
Thin Film ◽  
Quantitative Information ◽  
Interface Structure ◽  
Anomalous Dispersion ◽  
Model Calculations ◽  
Surface And Interface ◽  
Thin Film System ◽  
Dispersion Effects ◽  
Glancing Angle ◽  
Al Thin Film

ABSTRACTEXAFS studies using glancing angle fluorescence on the interface of the Cu-Al thin film system show that the sputtering process generates a different interface structure than for an evaporated one. To obtain quantitative information, the anomalous dispersion effects have to be considered. Simple model calculations are presented for the correction factor which yield good results for Au thin film data. Extension of this model to bilayer systems is discussed.

Electronic structure, novel synthesis, and O—H...O and C—H...O interactions in two 6-oxopiperidine-2-carboxylic acid derivatives

2014 ◽  
Vol 70 (8) ◽  
pp. 817-822 ◽  
Author(s):  
Viktor Vrábel ◽  
Július Sivý ◽  
Peter Šafář ◽  
Štefan Marchalín
Keyword(s):  
Electronic Structure ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Thiophene Ring ◽  
Three Dimensional ◽  
Anomalous Dispersion ◽  
Space Group ◽  
Novel Synthesis ◽  
Dispersion Effects

Molecules of (S)-6-oxo-1-(thiophen-2-ylmethyl)piperidine-2-carboxylic acid, C11H13NO3S, crystallize as single enantiomers in the space groupP21and the thiophene ring is disordered over two positions, while (S)-6-oxo-1-(thiophen-3-ylmethyl)piperidine-2-carboxylic acid, C11H13NO3S, crystallizes as a single enantiomer in the space groupP212121. Their absolute configurations were confirmed by anomalous dispersion effects in diffraction measurements on the crystals. The molecules of each compound are linked by a combination of strong O—H...O hydrogen bonds and weak C—H...O interactions, resulting in two- and three-dimensional networks, respectively, in the crystal structures.

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