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Today's Topics:
1. Exporting Athena projects data (Matteo Busi)
2. Collected k-space and fitting range (Taehoon Kim)
3. Re: Collected k-space and fitting range (Scott Calvin)
4. Re: Exporting Athena projects data (Bruce Ravel)
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Message: 1
Date: Thu, 3 Mar 2016 23:53:54 +0100
From: Matteo Busi <basebush@gmail.com>
To: ifeffit@millenia.cars.aps.anl.gov
Subject: [Ifeffit] Exporting Athena projects data
Message-ID:
<CAOyEiGi7jNury5oTAostBixxinOF+Vxcg2=8Sf8VeM9rywEmrg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi Bruce, hi mailing list readers.
With the project I'm working with, it came out that would be really useful
for me to export groups in both .xmu and .chi .
More in details I have to deal with a function that depends on both the chi
and xmu data. I tried to look at all the chances and through the guide but
I didn't find any function to do that. I was thinking of exporting
separately the .chi and .xmu data, but they have different point of the
Energy(eV) and that makes hard the programming of my evaluating scripts.
Should I use the spline function to estimate the .xmu data and use it
combined to the .chi data?
Hope it's all clear. Thanks
Best Regards,
Matteo, UiS
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Message: 2
Date: Fri, 4 Mar 2016 01:33:07 +0000
From: Taehoon Kim <oxonhoon@outlook.com>
To: "ifeffit@millenia.cars.aps.anl.gov"
<ifeffit@millenia.cars.aps.anl.gov>
Subject: [Ifeffit] Collected k-space and fitting range
Message-ID: <COL131-W950068446186D15FDFE67DCCBE0@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I am a bit confused about the range of k-space, which may affect the quality of EXAFS fitting. I would like to understand whether there is a difference between the fitting using an identical fitting range of k-space obtained from different range of k-space collected.
For example, is there a notable difference between a fitting of k = 2.3-11 which was deduced from a spectra data collected up to k=12 and a spectra data collected up to k=13 ?
Kind regardsTerry
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Message: 3
Date: Thu, 3 Mar 2016 21:52:34 -0500
From: Scott Calvin <scalvin@sarahlawrence.edu>
To: XAFS Analysis using Ifeffit <ifeffit@millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] Collected k-space and fitting range
Message-ID: <E2EAF91D-FEA9-42D7-82CA-A5B5D8EAB978@slc.edu>
Content-Type: text/plain; charset="utf-8"
Hi Terry,
The only possible difference would be due to differences in background subtraction. In practice, it?s a good idea to collect data ~1 inverse angstrom above the range you will analyze to make sure the background behaves properly toward the top of the fitted range. But beyond that it shouldn?t make much difference.
?Scott Calvin
Sarah Lawrence College
On Mar 3, 2016, at 8:33 PM, Taehoon Kim <oxonhoon@outlook.com<mailto:oxonhoon@outlook.com>> wrote:
Hello,
I am a bit confused about the range of k-space, which may affect the quality of EXAFS fitting.
I would like to understand whether there is a difference between the fitting using an identical fitting range of k-space obtained from different range of k-space collected.
For example, is there a notable difference between a fitting of k = 2.3-11 which was deduced from a spectra data collected up to k=12 and a spectra data collected up to k=13 ?
Kind regards
Terry
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Message: 4
Date: Fri, 4 Mar 2016 09:16:43 -0500
From: Bruce Ravel <bravel@bnl.gov>
To: XAFS Analysis using Ifeffit <ifeffit@millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] Exporting Athena projects data
Message-ID: <56D998CB.2010409@bnl.gov>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 03/03/2016 05:53 PM, Matteo Busi wrote:
> Hi Bruce, hi mailing list readers.
> With the project I'm working with, it came out that would be really
> useful for me to export groups in both .xmu and .chi .
> More in details I have to deal with a function that depends on both the
> chi and xmu data. I tried to look at all the chances and through the
> guide but I didn't find any function to do that. I was thinking of
> exporting separately the .chi and .xmu data, but they have different
> point of the Energy(eV) and that makes hard the programming of my
> evaluating scripts.
> Should I use the spline function to estimate the .xmu data and use it
> combined to the .chi data?
Hi Mateo,
I'm not quite clear on what you are asking for. Do you want an ascii
output file that has a column containing chi(E) using the energy grid of
the original data?
If so, would it suffice to add a column to the mu(E) ascii output file?
That seems to me like a natural solution.
Cheers,
B
--
Bruce Ravel ------------------------------------ bravel@bnl.gov
National Institute of Standards and Technology
Synchrotron Science Group at NSLS-II
Building 535A
Upton NY, 11973
Homepage: http://bruceravel.github.io/home/
Software: https://github.com/bruceravel
Demeter: http://bruceravel.github.io/demeter/
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