On Monday 08 September 2008 14:03:05 Carlo Segre wrote:
It sounds to me like the question is a bit more complex than that. I believe that with their continuous scan electronics, they get absorption as a function of time, not energy. If I am not mistaken, he is asking to have a conversion to energy built in somehow.
From this, I finally understand the question.
Athena does not currently provide a mechanism for expanding the energy axis. I could be convinced to code that up, but I would need a clearer statement of what you actually want done and several clear examples of how to process the data correctly. B On Monday 08 September 2008 13:59:42 Anatoly Frenkel wrote:
Khalid, what you can do is to note how much the higher energy (at energy E1) feature is shifted from what you think it should be (let's say by the amount of D eV), provided that you fixed the lower energy point to what you wanted (say, E0). Then, you should transfer the data into a spreadsheet and apply linear scaling:
E --> E0 + (E-E0)*D
It will ensure that in the range between E0 and E1 the data are linearly stretched or compressed, depending on the sign of D.
Anatoly
=
_____
From: Khalid, Syed [mailto:khalid@bnl.gov] Sent: Monday, September 08, 2008 12:21 PM To: ifeffit@millenia.cars.aps.anl.gov Subject: [Ifeffit] enrgy-axis-expansion
Is it possible in Athena to change the y-axis (energy scale) at two different energy points of an EXAFS scan?
I have a Ni foil spectrum as a function of time. The edge can be set at 8333.0 eV, and I want to to assign higher energy to a known feature in the Ni scan.
Syed Khalid 725D, National Synchrotron Light Source Brookhaven National Laboratory Upton, NY 11973
Ph: 631-344-7496 FAX: 631-344-3238 e-mail: khalid@bnl.gov
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
-- 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/