Dear Chris,
I would be glad to at least read the papers you mentioned. If it possible
you can send them here or at my email basebush@gmail.com when you have time.
Regards,
Matteo
Den lørdag 14. mai 2016 skrev
følgende:
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1. Re: Ifeffit Digest, Vol 159, Issue 3 (Christopher Thomas Chantler)
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Date: Fri, 13 May 2016 21:43:34 +0000
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Cc: Christopher Thomas Chantler javascript:;>
Subject: Re: [Ifeffit] Ifeffit Digest, Vol 159, Issue 3
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Dear All, Matteo
It is difficult to do post facto, but if you have a well-defined solid,
foil or crystal then mapping the thickness, measuring the mass and hence
determining the mass per unit area, for the exact region illuminated by the
beam, provides accurate units. Usually you will need to make a measurement
of the average m/A from (i) total mass and (ii) total area, and then (iii)
map the whole sample with X-ray tomography and (iv) the region illuminated
by the X-ray beam.
We have a series of papers which explain more than one methodology for
doing that within the XERT technique. If your sample is a solution it is a
bit more tricky, and I would refer you to recent JSR and JPCC papers for
our Hybrid technique. Both can work well but need a bit more care than a
normal XAFS measurement.
Best wishes
Chris
------------------------------------------------------------
Christopher Chantler, Professor, FAIP
Editor-in-Chief, Radiation Physics and Chemistry
Chair, International IUCr Commission on XAFS
President, International Radiation Physics Society
School of Physics, University of Melbourne
Parkville Victoria 3010 Australia
+61-3-83445437 FAX +61-3-93474783
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Today's Topics:
1. How to assign measure unit to XAFS data (Matteo Busi)
2. Re: How to assign measure unit to XAFS data (Alexey Boubnov)
3. Re: How to assign measure unit to XAFS data (Matt Newville)
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Date: Fri, 13 May 2016 02:11:39 +0200
From: Matteo Busi javascript:;>
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Subject: [Ifeffit] How to assign measure unit to XAFS data
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Hi Bruce, Matt, and mailing list readers,
I have one question regarding the XAFS data. I have collected absorption
coefficient in fluorescence regime of a CuSO4 penta hydrate sample(however
my question can be generalized to any compound).
Through Athena I then obtained the x\mu(eV) spectra as well as \chi(k) and
\chi(R). I am wondering how can I assign a unit to the x\mu values. I would
like to have it in the cm^-1 or cm^2 kg^-3 unit so than I can match it with
tabulated data for the Copper absorption coefficient and proceed with my
studies.
In case a treatment is needed for the normalized \mu , that would also suit
my situation.
My idea was to divide by the thickness of the sample but I don't find a
reasonable justificiation for this.
I really hope I made the question clear to any reader this time, and if
that is not the case I apologyze in advance.
Best Regards
Matteo
Matteo Busi