The anomalous dispersion corrections for zirconium

1977 ◽  
Vol 354 (1678) ◽  
pp. 291-302 ◽  
Keyword(s):  
Absorption Edge ◽  
Optical Constants ◽  
Scattering Amplitude ◽  
Theoretical Interest ◽  
Forward Scattering Amplitude ◽  
X Ray ◽  
Simultaneous Measurements ◽  
Sample Density ◽  
The Subject ◽  
Measurement Algorithm

A scanning X-ray interferometer was used to measure the forward scattering amplitude for zirconium at a number of wavelengths near the K absorption edge. The precision of previous experiments has usually been limited by lack of knowledge of either the sample density or its shape. These problems have been eliminated by making simultaneous measurements at two X-ray wavelengths. This new measurement algorithm can be applied at any wavelength which is accessible to X-ray interferometers. The X-ray optical constants of elements with Z ≥ 10 can be determined over the range 0.1 Å<A< 5Å to a precision which is sufficient to rekindle theoretical interest in the subject.

scholarly journals Dispersive X-Ray Synchrotron Studies of Pt-C Multilayers

1988 ◽  
Vol 143 ◽  
Author(s):  
B. Rodricks ◽  
F. Lamelas ◽  
D. Medjahed ◽  
W. Dos Passos ◽  
R. Smither ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Spectra ◽  
Absorption Edge ◽  
Optical Constants ◽  
Scattering Data ◽  
X Ray ◽  
Simultaneous Acquisition ◽  
Ccd Detector ◽  
Synchrotron Studies ◽  
X Ray Absorption

AbstractWe demonstrate the simultaneous acquisition of high-resolution x-ray absorption spectra and scattering data, using a combination of energy-dispersive optics and a twodimensional CCD detector. Results are presented on the optical constants of Pt and on the reflectivity of a platinum-carbon multilayer at the LIII absorption edge of Pt.

scholarly journals The Use of X-ray Interferometry to Measure X-ray Refractive Indices

1975 ◽  
Vol 28 (5) ◽  
pp. 543 ◽  
Author(s):  
DC Creagh
Keyword(s):  
Alkaline Earth ◽  
Scattering Amplitude ◽  
Forward Scattering ◽  
Refractive Indices ◽  
Quantum Mechanical ◽  
Forward Scattering Amplitude ◽  
X Ray ◽  
The Real ◽  
Atomic Species ◽  
Made In

A Laue-case X-ray interferometer has been constructed to enable the measurement of X-ray refractive indices for X-ray wavelengths ranging from Ag Krx.1 to Fe Krx.1. Refractive indices have been measured for some alkali and alkaline-earth halides. From these the real part of the X-ray forward scattering amplitude I!J.f~ has been calculated for each atomic species. Comments are made on the validity of some of the assumptions made in quantum mechanical estimations of I!J.f~.

scholarly journals Soft x-ray optical constants of sputtered chromium thin films with improved accuracy in the L and M absorption edge regions

2018 ◽  
Vol 124 (3) ◽  
pp. 035107 ◽  
Author(s):  
Franck Delmotte ◽  
Julia Meyer-Ilse ◽  
Farhad Salmassi ◽  
Regina Soufli ◽  
Catherine Burcklen ◽  
...  
Keyword(s):  
Thin Films ◽  
Absorption Edge ◽  
Optical Constants ◽  
X Ray ◽  
Improved Accuracy

X-Ray absorption edge elemental imaging of B. thuringienis

1989 ◽  
Vol 47 ◽  
pp. 212-213
Author(s):  
R. L. Stears
Keyword(s):  
Absorption Edge ◽  
Elemental Distribution ◽  
X Rays ◽  
Differential Absorption ◽  
Synchrotron Source ◽  
High Brightness ◽  
X Ray ◽  
Elemental Imaging ◽  
Cellular Integrity ◽  
X Ray Absorption

Because of the nature of the bacterial endospore, little work has been done on analyzing their elemental distribution and composition in the intact, living, hydrated state. The majority of the qualitative analysis entailed intensive disruption and processing of the endospores, which effects their cellular integrity and composition.Absorption edge imaging permits elemental analysis of hydrated, unstained specimens at high resolution. By taking advantage of differential absorption of x-ray photons in regions of varying elemental composition, and using a high brightness, tuneable synchrotron source to obtain monochromatic x-rays, contact x-ray micrographs can be made of unfixed, intact endospores that reveal sites of elemental localization. This study presents new data demonstrating the application of x-ray absorption edge imaging to produce elemental information about nitrogen (N) and calcium (Ca) localization using Bacillus thuringiensis as the test specimen.

scholarly journals Ionic and non-ionic intravenous X-ray contrast media: antibacterial agents?

2021 ◽  
pp. 028418512110198
Author(s):  
Frank Mosler ◽  
Johannes K Richter ◽  
Marc Schindewolf ◽  
Nando Mertineit ◽  
Hendrik von Tengg-Kobligk ◽  
...  
Keyword(s):  
Contrast Media ◽  
Bactericidal Effect ◽  
Future Research ◽  
Inhibitory Effects ◽  
X Ray ◽  
Percutaneous Abscess Drainage ◽  
Ionic Contrast ◽  
Bactericidal Effects ◽  
Free Iodine ◽  
The Subject

X-ray contrast media have been reported to have inhibitory effects on bacterial growth. Despite its potentially beneficial effect on patients, these features of contrast media have received relatively little attention in the medical literature in the past decades. The aim of this review is to evaluate the literature concerning the bactericidal and bacteriostatic effects of X-ray contrast media, specifically if there is a known difference concerning these effects between ionic and non-ionic contrast media. Systematic literature review was performed for the years of publication between 1911 and 2019. Since the publication of Grossich in 1911, the effect of iodine on the treatment of superficial infections in surgical procedures has been established clinical knowledge. Bacteriostatic and bactericidal effects of ionic X-ray contrast media are well established. However, non-ionic contrast agents have been the subject of little research in this respect. In past decades, the hypothesis emerged in the literature that mainly the concentration of free iodine might be responsible for any bacteriostatic or bactericidal effect of ionic X-ray contrast media. Nowadays, however, only non-ionic contrast media are used. The question regarding the mechanism and magnitude of bacteriostatic or bactericidal effects of these, non-ionic contrast media, could not be answered conclusively from this review. Non-ionic contrast media could be used intentionally when a local antibacterial effect is intended (e.g. in percutaneous abscess drainage), as well as to reduce the overall dose of antibiotics administered to a patient. Thus, this question remains relevant and might constitute the area of future research.

scholarly journals Modeling of the Resonant X-ray Response of a Chiral Cubic Phase

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 214
Author(s):  
Timon Grabovac ◽  
Ewa Gorecka ◽  
Damian Pociecha ◽  
Nataša Vaupotič
Keyword(s):  
Absorption Edge ◽  
Unit Cell ◽  
Resonant Peak ◽  
Cubic Phase ◽  
Tensor Form ◽  
Resonant Enhancement ◽  
X Ray ◽  
X Ray Scattering ◽  
Thermotropic Liquid Crystals ◽  
Carbon Absorption

The structure of a continuous-grid chiral cubic phase made of achiral constituent molecules is a hot topic in the field of thermotropic liquid crystals. Several structural models have been proposed so far. Resonant X-ray scattering (RXS), which gives information on the molecular orientation in the unit cell, could be applied to select the most appropriate model. We modeled the RXS response for the recently proposed chiral cubic phase structure with an all-hexagon chiral continuous grid. A tensor form factor of a unit cell is constructed, which enables calculation of intensities of peaks for all Miller indices. We find that all the symmetry allowed peaks are resonantly enhanced, and their intensity is much stronger than the intensity of the symmetry forbidden (resonant) peaks. In particular, we predict that a strong resonant enhancement of the symmetry allowed peaks (011) and (002), not observed in a nonresonant scattering, could be observed by RXS at the carbon absorption edge. By RXS at the sulfur absorption edge, one might observe a resonant peak (113) and resonantly enhanced peak (233), and resonant enhancement of all the peaks that are observed in a nonresonant scattering, which probably hide the rest of the predicted resonant peaks.

Optical Constants of GaSe at the Fundamental Absorption Edge

1977 ◽  
Vol 81 (2) ◽  
pp. 665-670 ◽  
Author(s):  
G. Antonioli ◽  
D. Bianchi ◽  
V. Canevari ◽  
U. Emiliani ◽  
P. Podini
Keyword(s):  
Absorption Edge ◽  
Optical Constants ◽  
Fundamental Absorption Edge
Sign in / Sign up

Export Citation Format

Share Document