Hi Eun-Suk,
Sorry for the trouble, the docs are now fixed. FWIW, various versions of
the diffkk code (Pascal, Fortran, Python) have been around for many years,
originally written by Julie Cross.
We could probably translate her iterative KK code too, but it's use is a
bit fragile. Still, if you have real DAFS measurements and want to extract
a pure f' or f'' signal, this method is probably the best approach. It
might be that someone has done this already....
--Matt
On Wed, Jan 20, 2016 at 11:34 PM, JeongEunSuk
Dear Bravel
Thank you for your kind e-mail.
I am looking at Larch and following Larch Totorial. When I clicked 8.8 XAFS: diffkk section, the website was not found.
how can I contact that wensite section?
To: ifeffit@millenia.cars.aps.anl.gov From: bravel@bnl.gov Date: Sat, 16 Jan 2016 14:49:09 -0500 Subject: Re: [Ifeffit] DAFS calculation
No version of Atoms has ever done anything more than simple simulations intended to help plan a DAFS measurement.
To my knowledge, there is no general purpose software for DAFS that is widely available. I certainly haven't written any. That said, Larch has a lot of the tools you'd need to make headway, including cross-sections (http://xraypy.github.io/xraylarch/xray/index.html) and
a
Kramers-Kronig transformation (https://github.com/xraypy/xraylarch/blob/master/plugins/xafs/diffkk.py -- written by me, possibly correctly).
Since DAFS is so little used, it remains a sort of entrepreneurial endeavor. If you are willing to make the measurement, I think you have to also be willing to deal with the data on your own.
B
On 01/14/2016 08:00 PM, JeongEunSuk wrote:
Hello
I've heard that Atoms 3.0 code is available to calculate DAFS. I would like to calculate it. Do you have any example for it? I don't know how to use keywords in Atoms 3.0 such as dafs, emin, emax and others.
Best regards
Eun-Suk Jeong
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