difference spectra function in (D)Athena
Hello Mailing List, I have a question about the difference spectrum function. I chose difference spectrum in norm mu(E) in the Demeter pull down menu. I set the standard and chose another spectrum. Plotting both the difference and spectra gives me the image attached. Is the difference shifted significantly to lower energy? If so, why does it change its energy scale relative to the plotted spectra? Is there a setting I can change or could this be a small bug? Thank you all, buena salud, Chris Patridge -- Christopher J. Patridge PhD. Contact: (315)-529-0501
Hi Chris, Thanks for the bug report -- that is clearly a problem. I'll look into it and get back to you. B ________________________________________ From: ifeffit-bounces@millenia.cars.aps.anl.gov [ifeffit-bounces@millenia.cars.aps.anl.gov] on behalf of Christopher Patridge [patridge@buffalo.edu] Sent: Wednesday, April 11, 2012 10:39 AM To: XAFS Analysis using Ifeffit Subject: [Ifeffit] difference spectra function in (D)Athena Hello Mailing List, I have a question about the difference spectrum function. I chose difference spectrum in norm mu(E) in the Demeter pull down menu. I set the standard and chose another spectrum. Plotting both the difference and spectra gives me the image attached. Is the difference shifted significantly to lower energy? If so, why does it change its energy scale relative to the plotted spectra? Is there a setting I can change or could this be a small bug? Thank you all, buena salud, Chris Patridge -- Christopher J. Patridge PhD. Contact: (315)-529-0501
If it helps to diagnose and fix the bug, I just applied the E shifts found
after reference calibration to the difference spectra and it fixed the
problem.
thanks for the quick response,
Chris
On Wed, Apr 11, 2012 at 11:36 AM, Ravel, Bruce
-- Christopher J. Patridge PhD. Contact: (315)-529-0501
On Wednesday, April 11, 2012 04:01:06 pm Christopher Patridge wrote:
Chris, You assessment was spot on. The energy shifts (and a few other things) were being handled incorrectly in the difference spectrum. The next release of Demeter will fix that problem. The difference spectrum page in Athena will still only have limited functionality, but at least what it has should work correctly. Thanks, 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/ifeffit/Demeter
participants (3)
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Bruce Ravel -
Christopher Patridge -
Ravel, Bruce