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
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 mlhttp://cars9.uchicago.edu/%7Eravel/software/doc/Athena/html/process/cal.ht%0...
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/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