Four-dimensional x-ray phase tomography with Talbot interferometer and white synchrotron light

2010 ◽  
Author(s):  
Atsushi Momose ◽  
Wataru Yashiro ◽  
Sebastien Harasse ◽  
Hiroaki Kuwabara ◽  
Katsuyuki Kawabata
Keyword(s):  
X Ray ◽  
Talbot Interferometer ◽  
Synchrotron Light

scholarly journals XRD Data Visualization, Processing and Analysis with d1Dplot and d2Dplot Software Packages

Proceedings ◽  
2020 ◽  
Vol 62 (1) ◽  
pp. 9
Author(s):  
Oriol Vallcorba ◽  
Jordi Rius
Keyword(s):  
Data Analysis ◽  
Data Visualization ◽  
X Ray Diffraction ◽  
Specific Data ◽  
X Ray ◽  
Software Packages ◽  
Compound Database ◽  
Synchrotron Light ◽  
User Friendly ◽  
Transformation Processes

The d1Dplot and d2Dplot computer programs have been developed as user-friendly tools for the inspection and processing of 1D and 2D X-ray diffraction (XRD) data, respectively. d1Dplot provides general tools for data processing and includes the ability to generate comprehensive 2D plots of multiple patterns to easily follow transformation processes. d2Dplot is a full package for 2D XRD data. Besides general processing tools, it includes specific data analysis routines for the application of the through-the-substrate methodology [Rius et al. IUCrJ 2015, 2, 452–463]. Both programs allow the creation of a user compound database for the identification of crystalline phases. The software can be downloaded from the ALBA Synchrotron Light Source website and can be used free of charge for non-commercial and academic purposes.

Development of Diamond-Based X-ray Detection for High Flux Beamline Diagnostics

2009 ◽  
Vol 1203 ◽  
Author(s):  
Jen Bohon ◽  
John Smedley ◽  
Erik M. Muller ◽  
Jeffrey W. Keister
Keyword(s):  
Single Crystal ◽  
Linear Response ◽  
Voltage Dependence ◽  
Cvd Diamond ◽  
High Flux ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Single Crystal Diamond ◽  
Synchrotron Light ◽  
Pulse Structure

AbstractHigh quality single crystal and polycrystalline CVD diamond detectors with platinum contacts have been tested at the white beam X28C beamline at the National Synchrotron Light Source under high-flux conditions. The voltage dependence of these devices has been measured under DC and pulsed-bias conditions, establishing the presence or absence of photoconductive gain in each device. Linear response has been achieved over eleven orders of magnitude when combined with previous low flux studies. Temporal measurements with single crystal diamond detectors have resolved the ns scale pulse structure of the NSLS.

In situsmall-angle X-ray scattering characterization of X-ray-induced local heating

2014 ◽  
Vol 47 (6) ◽  
pp. 2078-2080 ◽  
Author(s):  
Monika Witala ◽  
Jun Han ◽  
Andreas Menzel ◽  
Kim Nygård
Keyword(s):  
Local Heating ◽  
Liquid Mixtures ◽  
Glass Capillary ◽  
Sample Container ◽  
X Ray ◽  
X Ray Scattering ◽  
Synchrotron Light ◽  
Ray Scattering

It is shown that small-angle X-ray scattering from binary liquid mixtures close to the critical point of demixing can be used forin situcharacterization of beam-induced heating of liquid samples. For demonstration purposes, the proposed approach is applied on a well studied critical mixture of water and 2,6-lutidine. Given a typical incident X-ray flux at a third-generation synchrotron light source and using a 1.5 mm-diameter glass capillary as sample container, a beam-induced local temperature increase of 0.45 ± 0.10 K is observed.

scholarly journals Design and performance of an X-ray scanning microscope at the Hard X-ray Nanoprobe beamline of NSLS-II

2017 ◽  
Vol 24 (6) ◽  
pp. 1113-1119 ◽  
Author(s):  
E. Nazaretski ◽  
H. Yan ◽  
K. Lauer ◽  
N. Bouet ◽  
X. Huang ◽  
...  
Keyword(s):  
Material Science ◽  
Phase Contrast ◽  
Heat Dissipation ◽  
Regulation System ◽  
Scanning Microscope ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Synchrotron Light ◽  
Differential Phase Contrast ◽  
And Performance

A hard X-ray scanning microscope installed at the Hard X-ray Nanoprobe beamline of the National Synchrotron Light Source II has been designed, constructed and commissioned. The microscope relies on a compact, high stiffness, low heat dissipation approach and utilizes two types of nanofocusing optics. It is capable of imaging with ∼15 nm × 15 nm spatial resolution using multilayer Laue lenses and 25 nm × 26 nm resolution using zone plates. Fluorescence, diffraction, absorption, differential phase contrast, ptychography and tomography are available as experimental techniques. The microscope is also equipped with a temperature regulation system which allows the temperature of a sample to be varied in the range between 90 K and 1000 K. The constructed instrument is open for general users and offers its capabilities to the material science, battery research and bioscience communities.

scholarly journals Photoproduction of H3+ from gaseous methanol inside dense molecular clouds

2008 ◽  
Vol 4 (S251) ◽  
pp. 369-370
Author(s):  
S. Pilling ◽  
D. P. P. Andrade ◽  
A. C. F. Santos ◽  
H. M. Boechat-Roberty
Keyword(s):  
Cross Sections ◽  
Molecular Clouds ◽  
Mass Spectra ◽  
Column Density ◽  
X Rays ◽  
Alternative Source ◽  
X Ray ◽  
Flight Mass Spectrometry ◽  
Dense Molecular Cloud ◽  
Synchrotron Light

AbstractWe present experimental results obtained from photoionization and photodissociation processes of abundant interstellar methanol (CH3OH) as an alternative route for the production of H3+ in dense clouds. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS) employing soft X-ray and time-of-flight mass spectrometry. Mass spectra were obtained using the photoelectron-photoion coincidence techniques. Absolute averaged cross sections for the production of H3+ due to molecular dissociation of methanol by soft X-rays (C1s edge) were determined. The H3+'s photoproduction rate and column density were been estimated adopting a typical soft X-ray luminosity inside dense molecular and the observed column density of methanol. Assuming a steady state scenario, the highest column density value for the photoproduced H3+ was about 1011 cm2, which gives the ratio photoproduced/observed of about 0.05%, as in the case of dense molecular cloud AFGL 2591. Despite the small value, this represent a new and alternative source of H3+ into dense molecular clouds and it is not been considered as yet in interstellar chemistry models.

scholarly journals Crystallography and the IYCr2014 in Uruguay and Latin America

2014 ◽  
Vol 70 (a1) ◽  
pp. C1288-C1288
Author(s):  
Leopoldo Suescun
Keyword(s):  
Latin America ◽  
Latin American ◽  
The Political ◽  
X Ray ◽  
X Ray Crystallography ◽  
Synchrotron Light ◽  
The Uk ◽  
People Group ◽  
Research Equipment

X-ray Crystallography has been present in Uruguay since the 50's. A project funded by UNESCO brought Prof. S. Furberg to Montevideo and introduced equipment in a laboratory of Universidad de la República, Facultad de Ingeniería where Prof. Stephenson Caticha Ellis worked.[1] During the period 1968-1995 the political and economic situation of the country reduced research in general and crystallography in particular, re-emerging in the late 90's with the acquisition of an automatic single-crystal diffractometer by Facultad de Química. After the opening of the Brazilian Synchrotron Light Laboratory in 1997 several projects in crystallography have also developed with the successful realization of half a dozen postgraduate projects. Currently there are chemical, biological and physical crystallography labs in the country, with a reduced but sufficient pool of research equipment. The main institutions where Crystallography is developed are Universidad de la República (3 groups) and the Institut Pasteur de Montevideo. There has been an explosive growth of crystallography in the country in recent years. From the 4-people group found at F. de Química in 2000 to over 50 people of the Red Uruguaya de Cristalografía recently founded.[2] This development wouldn't have happened without the strong influence of Latin American crystallographers, mainly but not only from Argentina and Brazil, and also collaboration from extra-regional colleagues from USA, the UK, France and Switzerland. Very recently additional impulse has come from Latin America with the formation of the Latin American Cryst. Assoc. LACA[3]. Uruguayan crystallographers are currently involved in dissemination and academic projects for IYCr2014 such as an open-sky photo-gallery in Montevideo, a national crystal growth competition, a protein crystallography school and two UNESCO/IUCr OpenLab Type 1 sponsored by Bruker. A description of on-going projects in Uruguay and the region will be outlined in the presentation

scholarly journals Multielement analysis of plant extracts with potential use in the treatment of peptic ulcers by synchrotron radiation total reflection X-ray fluorescence

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5375
Author(s):  
Leticia Diniz Vieira ◽  
Káthia Takeda da Silva ◽  
Rodrigo Sanchez Giarola ◽  
Guilherme Franco Inocente ◽  
Hélio Kushima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Intermediate Stage ◽  
Total Reflection ◽  
New Drugs ◽  
Peptic Ulcers ◽  
X Ray ◽  
Analytical Technique ◽  
Methanolic Extracts ◽  
Synchrotron Light ◽  
Almost All

Some plants popularly employed for the treatment of peptic ulcers have proved to be attractive sources of new drugs. Despite extensive research, the pharmacological and toxicological potentials of these plants are not fully understood. In this context, the aim of this work was to analyze the multielemental composition of the methanolic extracts of three of those plants, Alchornea glandulosa (AG), Davilla elliptica (DE) and Davilla nitida (DN), with the intention of contributing to the understanding of the mechanisms of action of these extracts. For this purpose, we used the analytical technique of total reflection X-ray fluorescence (TXRF) by synchrotron radiation at the Brazilian Synchrotron Light Source (LNLS/CNPEM). It was possible to determine the concentrations of the elements: P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Rb and Br in all of the samples. Selenium (Se) was detected only in the DN extract. An inverse relationship between the concentrations of elements with proven effectiveness and the gastroprotective activity of extracts considering induction protocols with ethanol and non-steroidal anti-inflammatory drugs (NSAIDs) was obtained. This data suggests that the function of the extract is not only associated with providing the elements for restoring the gastric mucosa but that it also promotes the displacement of these elements from other parts of the mucosa to the damaged area. Correlations between the concentrations of the elements were also obtained. In the DE extract, which is the most effective extract for both induction protocols, the obtained correlations were above 70% among almost all of the elements, and no anticorrelations were found. For the other two extracts, in the less effective extract (AG) anticorrelations above 70% were predominantly found. Meanwhile, in the DN extract, a few high anticorrelations were found, which may explain its intermediate stage of effectiveness.

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