[Ifeffit] XANES

[Aimee Morey]

David, Scott and Andreas,

Thanks you so much, that is exactly what I want to do.  Another  question
before I get myself into trouble.  Is it advisable to set E-Eo before or
after I want to analyze with linear combinations?  Or is either option
viable?

Aimee

On Thu, Mar 12, 2009 at 12:55 PM, Voegelin, Andreas
<Andreas.Voegelin at 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 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<http://cars9.uchicago.edu/%7Eravel/software/doc/Athena/html/process/cal.ht%0Aml>
>
> 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/<http://cars9.uchicago.edu/%7Eravel/software/exafs/>
>
>
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-- 
Aimee M. Morey
Graduate Assistant
Department of Chemistry, U-3060
University of Connecticut
55 North Eagleville Rd
Storrs, CT 06269-3060
Phone # (860) 486 - 6567
Fax # (860) 486 - 2981
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