Not only is it a possible explanation, it is the explanation.
It represents the tube bremsstralum truncated by the Ni absorption edge.
As long as you're careful, removing it shouldn't be an issue, although it
is always better to either model it properly, or to not collect such data
on the first p
I am glad you find FPSM an inspiring idea, me and my co-workers will be quite
happy if this will results in some citations. The FPSM publication back in 2019
was a troubled submission. It took us more than 3 years as initially was just
rejected (for economical reasons, as it would be unfair agai
It is call graininess, as Miguel said before, these are mosaic single crystals
and depending on your source (divergence, spot dimension at different angles
etc.) you get each mosaic crystal to create a diffraction peak that especially
at low two-theta angle may be displaced a lot from its theore
Dear Frank,Same as you. I have not a complete solution.BestArmelenvoyé : 6 septembre 2023 à 16:57de : Frank Girgsdies à : Le Bail Armel Cc: Rietveld_L objet : Re: Step-like baslineDear Armel,Thanks for this nice quiz!However, after identifying the following spectral impurities: Cu K_beta, W L_alp
Dear Armel,
Thanks for this nice quiz!
However, after identifying the following spectral impurities:
Cu K_beta,
W L_alpha1,2
W L_beta1,2,3,4 and
W L_gamma1,
I am stuck now, leaving bout 1/2 to 1/3 of the tiny extra peaks
unexplained.
Some of them look suspiciously like Cu K_alpha1+2 doubl
Hi Alan,
Accelerator-driven neutron sources are a lot cheaper than spallation
sources. Moreover, Figure 54 in the ICONE document shows that the
scientific productivity of neutron sources does not depend on the flux
of the source. And the biggest point might be the return to building new
neutr
Glad you are following neutron developments Armel. This document points out
how French science has suffered due to the shutdown of the only national
neutron sources, in Grenoble and Paris. It argues that ESS when it is
finally operational, cannot possibly satisfy the national requirement if
ILL is
Interesting document about neutrons in French, though the word "Rietveld"appears only once, page 162, the word "poudre" (=powder) is more frequent :https://2fdn.cnrs.fr/wp-content/uploads/2023/09/ICONE-digital.pdf
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You are right Radovan. The sample mail-in system is one way of improving SR
and N access times. "Discretionary time" reserved for people who have a hot
experiment and can come at short notice, is another, together with speeding
up the usual proposal system. These mechanisms already apply at ILL, bu
No, you are not provocative Alan. You are right. I have reacted only to the
X-ray discussion (no neutrons in the labs).
It is a pity that the procedure for getting the beamtime at the synchrotron and
neutron sources is still so time-consuming. At least at the synchrotron, there
is an activity to
Nice example for real world, Armel!
These huge flakes are by no means single crystals, so I tend to interpret
the small peaks in the feet of the maxima as stemming from slightly
misaligned regions, sort of graininess.
Did you try under the polarizing microscope?
Best
Miguel
El mié, 6 sep. 202
"*The biggest improvement was synchrotron radiation*".
No. The biggest improvement for the profile refinement of atomic and
magnetic structures (Rietveld refinement in the strict sense) was high
resolution neutron powder diffractometers with large area detectors :-)
Even SR gives undue weight to he
Hi,In the same subject.A special "powder pattern" to play with (try to explain all peaks) :http://cristal.org/muscovite.pdfBestArmel
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Dear Reitvelders
I am overwhelmed with your insightful responses. I am grateful for that.
Indeed I have Ni filter and the adsorption added is indeed a good possible
explanation since we get similar step-like profiles with completely
different materials and samples.
With the understanding that th
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