On Thu, Mar 12, 2009 at 12:55 PM, Voegelin, Andreas <Andreas.Voegelin@eawag.ch> wrote:

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@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@millenia.cars.aps.anl.gov
[mailto:ifeffit-bounces@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@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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