Cyril,
Is the copper foil a separate file or is this file imported together
with the other scans as a reference channel?
If separate files, then there is not a clear relationship between sample
and the foil since these were collected at different times and hence
corrections for drift or other gremlins will not be the same.
Chris
Christopher J. Patridge, PhD
NRC Post Doctoral Research Associate
Naval Research Laboratory
Washington, DC 20375
Cell: 315-529-0501
On 3/8/2013 2:49 AM, Bajamundi Cyril wrote:
Dear Bruce,
The motivation for the question is that I'm concerned whether the shift in E
values after calibration is conserved when the calibrated data has been saved
in the .xmu file.
But thanks to the link you have sent to me and your previous answer in the mailing list
archive
http://www.mail-archive.com/ifeffit@millenia.cars.aps.anl.gov/msg02755.html
things are a bit clearer now.
So here's a follow up. I have taken the following scans successively
Cu foil
Sample1_scan1
Sample1_scan2
Sample1_scan3
I then process the data in Athena, to begin I calibrated the Cu foil spectrum, such that
the nice orange circle falls at the tabulated value of 8979 eV. This in turn gives some
eshift value of -0.360. What is the relationship of this eshift to the
spectra of sample 1, should I apply this eshift to the scans for sample 1 as? Definitely
I can't apply the E0.
This is still a bit vague in my mind, even after reading the basic data
processing section in the documentation.
Thank you in advance.
Warm regards,
Cyril
-Original Message-
From: ifeffit-boun...@millenia.cars.aps.anl.gov
[mailto:ifeffit-boun...@millenia.cars.aps.anl.gov] On Behalf Of Bruce Ravel
Sent: Thursday, March 07, 2013 3:55 PM
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] MBACK and Athena
On Thursday, March 07, 2013 12:10:26 PM Bajamundi Cyril wrote:
1. Is this procedure valid? In the sense that no information or features
of the spectrum are lost from merge.xmu to merged.xmu.mnor file.
Do you have some reason to believe that might be happening? If so, perhaps you
could ask a more explicit question.
2. How will the procedure Calibrate data affect this procedure?
Calibration, as it is defined in Athena, is a procedure that changes *both* the
E0 and the Eshift values so that a selected point in the spectrum has a
selected energy value.
http://bruceravel.github.com/demeter/aug/process/cal.html
I'm not certain I've answered your question, but I am unclear what is
motivating your question.
B
--
Bruce Ravel bravel at bnl.gov
National Institute of Standards and Technology Synchrotron Methods Group at
NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973
My homepage:http://xafs.org/BruceRavel
EXAFS software: http://cars9.uchicago.edu/ifeffit/Demeter
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