[Ifeffit] XANES

Voegelin, Andreas Andreas.Voegelin at eawag.ch
Thu Mar 12 11:55:09 CDT 2009


Hi 
 
Assuming your spectrum is calibrated and you know the "correct" E0 , you can use the following workaround to plot data on a (E-E0) axis:  set the energy shift in Athena to "minus E0" and Athena's E0 to zero.
 
Andreas
 
 

________________________________

Von: ifeffit-bounces at millenia.cars.aps.anl.gov im Auftrag von Barton, David (DG)
Gesendet: Do 12.03.2009 17:31
An: XAFS Analysis using Ifeffit
Betreff: Re: [Ifeffit] XANES



Bruce,

I believe what Aimee wants to see is E-Eo (eV) plotted on the x-axis
instead of E (eV) in the Athena plot window.  I don't think you have the
option anywhere in Athena to plot the data like this.

Aimee,

Athena does let you easily export the data as an x-y dataset that can
you put into your favorite plotting software and do the simple
subtraction that you desire to plot.

Dave

-----Original Message-----
From: ifeffit-bounces at millenia.cars.aps.anl.gov
[mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf Of Bruce
Ravel
Sent: Thursday, March 12, 2009 9:11 AM
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] XANES

On Thursday 12 March 2009 08:24:44 am Aimee Morey wrote:
> I have collected full XANES and EXAFS spectra.  I have imported the
full
> spectrum into Athena.  I am now trying to analyze using XANES, but I
am
> have trouble figuring out how to set an absolute energy, i.e. 7709 eV
= 0
> eV or such, and have the energy scaled negatively and positively.  It
is
> probably super simple, can anyone please help?

Hi Aimee,

Data calibration is explained in the Athena User's Guide:

http://cars9.uchicago.edu/~ravel/software/doc/Athena/html/process/cal.ht
ml

If that is too terse or does not address your question, you might
consider making a small Athena project file which demonstrates what
you are confused about and then post that to the mailing list.
Posting data is usually the best way to get a concrete answer.

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/~ravel/software/exafs/


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