Questions related to Synchrotron Radiation
Hello all, which software can be used to export the standard XRD spectra of titanium alloy under different X-ray wavelength? How to operate? Such as 0.11 angstrom or 0.6887 angstrom (These X-ray wavelengths are generated by Synchrotron radiation XRD)
I recently have difficulty in processing the synchrotron radiation (λ=0.6887 nm) XRD data by Jade 6. I’m looking forward to some kind advices.
My samples are Ti-55531 alloys. The “.chi” files have been converted to “.txt” and “.mdi” ones which are compatible with Jade 6. At this stage, I am able to open the files in Jade 6, switch the target option from “Cu” to “US” on the top left corner, and input 0.6887, as shown in Fig. 1.
After clicking OK, I retrieved Ti as the only possible element and added the standard pattern of “Ti, PDF#44-1288, Im-3m (229)” into my XRD pattern. As shown in Fig. 2, huge peak difference is observed between standard PDF card (vertical lines in yellow) and the experimental results.
Could you please help me with this issue in analyzing synchrotron XRD results in Jade 6? Your kindness will be highly appreciated!
I am just wondering if someone can direct me to equations and processes for Seeded FELs? Something general, not necessarily XFELs.
I am aware of the undulator equations etc, etc - but how does that all change/get affected by an external laser trying to create microbunches?
Any assistance would be greatly appreciated as I'm stuck, and I've bothered certain individuals a bit too much (so I'd prefer to leave them alone)...
Edit: Any and all equations would be helpful (i.e. gain length, expected output power, expected output harmonics, etc)
We collected the spectral maps of the soil. The aperture size of map was 10 μm. The map profiles of aliphatic compounds, carboxylic acids, protein, lignin, polysaccharides, and iron oxides (Fe-O) were created with peak heights at 2920, 1716, 1653, 1513, 1035, and 690 cm-1, respectively. We performed a correlation analysis in iron oxides and the organic compounds. The correlation coefficients (R2) of Fe-O with the organic compounds reflects the spatial distribution of organic compounds with iron oxides.
I want to know whether the slope values of organic compounds and Fe-O can represent the relative contents of organic components in the measured regions of SR-FTIR?
Combined analysis the correlation coefficients and slope values, if we can obtain the relative contents of organic components, which was associated with iron oxides? Not the values, but the large or little
The case: quasar 3C 273 at 15-24-43 GHz. Faraday rotation measure at ~1 mas from the core changes its value from +3000 rad/m^2 to -3000 rad/m^2 in 3 month. EVPA depends linearly on lambda squared, fits are ok.
Any ideas on how can the RM change so swiftly?
Is there a way to obtain minimum synchrotron radiation without increasing the radius of the path.Also does the mass of the particle play any role in the amount of radiation emitted?
I have some colloidal samples difficult to dry and I am looking for other possibilities to study the structure of these samples.
I have single crystal X-ray diffraction data collected with synchrotron radiation (wavelength 0.6631 Å ). I would like to know if there is a method to estimate the contribution of Compton scattering to the total diffracted intensity per solid angle .
Framework Grant Röntgen-Ångström Cluster
The Röntgen-Ångström Cluster (RÅC) is a Swedish-German research collaboration within structural biology and material sciences. The aim of the grant is to strengthen research in materials science and structural biology that uses neutron and/or synchrotron radiation and to stimulate the use and/or development of expertise in large-scale research infrastructures currently available or being planned in the area.
The Swedish Research Councils’ framework grant aims to give researchers the opportunity to do research with significant scope and depth. Framework grants can give strong research groups the freedom to act within relatively generous frameworks regarding funding and choice of research orientation. The Swedish Research Council supports basic research of high quality in all scientific disciplines and promotes research cooperation and exchanges of experiences.
More information can be found here:
If interested, please contact me by sheng.guo at chalmers.se. Note the deadline for application is 2015-06-03.
Has anyone worked on nanoparticles using either X-ray absorption near edge structure (XANES) or Synchrotron radiation? I would appreciate an enlightenment on better techniques out of the two to examine biotransformation/speciation of nanoparticles in plant parts after uptake.
Mercuric nitrate monohydrate can easily take water from air, so is it really difficult to obtain a uniform layer of salt.
I know that people can prepare Hg sorbed on goethite from Hg(NO3)2 solution. However, I was having hard time to find reference materials that were made of Hg(NO3)2. I was wondering if I need to make Hg(NO3)2 reference material, should I consider to let Hg(NO3)2 precipitate from solution instead of directly using salt?
Thank you very much
Can any one explain physically why the refractive index for x-rays is less than one? Mathematically in many books it has been explained using the Lorentz oscillator model, but can some one explain it physically?
Randall’s plaques are soft tissue calcifications found in the deep renal medulla skirting the surface of the epithelium of the papilla, where they act as nucleating elements for renal calculi or stones. These plaques have been described until now as composed of carbapatite (poorly crystallized carbonated calcium phosphate or carbonated apatite, abbreviated to CA). Characterization of these plaques in real environments has led to more surprising results.
A group consisting of physicists from the Laboratoire de Physique des Solides and the DIFFABS beamline at SOLEIL, in collaboration with doctors at the Necker Hospital, have carried out for the first time the characterization of a Randall plaque positioned on its renal papilla. More precisely, they carried out X-ray absorption spectroscopy experiments at the Ca K-edge on DIFFABS.
These researchers were able to study the exact nature and proportions of the mineral phases present in the Randall plaque when moving from the top of the papilla towards the deep medulla without the need for preparation protocols that might alter the sample’s physicochemical state. They then showed that the absorption spectra obtained looked more like that of amorphous carbonated calcium phosphate (ACCP) than that of CA, therefore revealing that Randall plaques could be composed mainly of ACCP and not of CA.
This result, in apparent contradiction to that stated in published literature, is easily explained if one takes into account the fact that the level of water in the sample governs the transition between ACCP and CA, of which it is the precursor. In earlier studies, the samples were dehydrated, which could have modified the phase transition from ACCP to CA, whereas, in these experiments, the water levels were maintained; the Randall plaque could then be characterized while keeping its physicochemistry intact.
It should be noted that ACCP is evidence of an oversaturation in calcium phosphate by an excess of calcium and/or phosphate and/or due to too high a pH. Its presence in increasingly young subjects raises the question: does nutrient-enriched food specially aimed at young children affect the physiology of the kidney?
The debate is open.
I am looking for an article that is very much exciting, relating to synchrotron radiation and its techniques.
For a presentation that is to be performed soon, there are so many to choose from.
Seeking to understand the mechanism of how x-ray generated in synchrotron is circularly polarized before it comes out of a beamline.
We know that accelerating charges radiate. What if the charge was static in some reference frame and the observer was the one who accelerates with respect to that frame? Is there any relation to Unruh radiation?
The range of the excitation energy used in the experiment (PIFS) for detecting the fluorescence of water after excitation with synchrotron radiation is from 532 ev to 542 ev. The cross section fluorescence curve show that there is an increase in the fluorescence just above the threshold ionization. This kind of feature appeared also in the case of the CO2 but only after the shake-up photoionization (in the range of 540-590 ev) and the people explain that due to the resonance in shake-up satellites which may increase the number of excited fragments and then enhance fluorescence.
I am looking at the design of a turnaround loop and I have a position and angle feed forward system designed with BPMs upstream of the turnaround loop and kickers downstream. Synchrotron radiation will cause some uncorrelated jitter between the BPMs and the kickers and I need to be able to quantify this jitter in terms of the synchrotron radiation in the loop so I can design the optics. Does anyone have any information or links to useful papers. Help would be greatly appreciated.
In accelerator physics where we study/control the electron beam in the storage ring, we describe magnetic elements with matrices and have some math and terminology to describe the optics (e.g. beta functions or Twiss parameters, emittance, etc). The electron beam produces a photon beam that then goes down the beamline. I understand one can use a ray tracing code to follow the photons through mirrors, CRL's etc. And one talks of focusing optics and other optics. But is there a commonly used matrix formalism to describe the linear optics of beamlines? Can someone point me to a reference?