No, if you enter any number in the energy shift window, the entire scale is shifted. This linear scaling can be done only for small shifts, in XANES region. For larger shifts you need parabolic correction, or even use a splice method where different corrections are applied to different sub-ranges of the data, and then the entire (supposedly, correct) energy range is spliced from Such corrected ranges. Suppose, you took data at the beamline where you discovered there is energy tracking problem, which is reproducible. Then you can fix it, assuming you collected also data in a reference foil and can compare such data against a "standard" data of the foil. It is very time consuming but doable. Anatoly ----- Original Message ----- From: ifeffit-bounces@millenia.cars.aps.anl.gov To: ifeffit@millenia.cars.aps.anl.gov Sent: Tue Sep 09 09:22:14 2008 Subject: Re: [Ifeffit] Ifeffit Digest, Vol 67, Issue 11 Anatoly: I will try your approach: Same problem I can address in a different way. Suppose the energy is not linear in case of a Pt-L3 scan. We can set Pt-L3 edge at known 11564 eV. Scanning all the way to L2 edge and say we find it 200 eV off (exaggerating), can we set in Athena the L2 edge at known 13273 eV, while the L3 edge is still at 11564 eV? -----Original Message----- From: ifeffit-bounces@millenia.cars.aps.anl.gov [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov]On Behalf Of ifeffit-request@millenia.cars.aps.anl.gov Sent: Monday, September 08, 2008 4:44 PM To: ifeffit@millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 67, Issue 11 Send Ifeffit mailing list submissions to ifeffit@millenia.cars.aps.anl.gov To subscribe or unsubscribe via the World Wide Web, visit http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit or, via email, send a message with subject or body 'help' to ifeffit-request@millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-owner@millenia.cars.aps.anl.gov When replying, please edit your Subject line so it is more specific than "Re: Contents of Ifeffit digest..." Today's Topics: 1. FW: enrgy-axis-expansion (Khalid, Syed) 2. Re: enrgy-axis-expansion (Bruce Ravel) 3. Re: enrgy-axis-expansion (Anatoly Frenkel) 4. Re: enrgy-axis-expansion (Bruce Ravel) 5. ODP: enrgy-axis-expansion (Zajac, Dariusz) ---------------------------------------------------------------------- Message: 1 Date: Mon, 8 Sep 2008 13:46:47 -0400 From: "Khalid, Syed" Subject: [Ifeffit] FW: enrgy-axis-expansion To: Message-ID: <55C249AA18FE564E86564FEB2412D45BEFD187@exchangemb1.bnl.gov> Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Khalid, Syed Sent: Monday, September 08, 2008 12:21 PM To: 'ifeffit@millenia.cars.aps.anl.gov' Subject: enrgy-axis-expansion It is X-axis, sorry my typo. How to expand or shrink in an EXAFS spectrum, using Athena. 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 ------------------------------ Message: 2 Date: Mon, 8 Sep 2008 13:51:12 -0400 From: Bruce Ravel Subject: Re: [Ifeffit] enrgy-axis-expansion To: XAFS Analysis using Ifeffit Message-ID: <200809081351.12614.bravel@bnl.gov> Content-Type: text/plain; charset="iso-8859-1" On Monday 08 September 2008 12:20:47 Khalid, Syed wrote:

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.

I am not 100% certain I understand the question, but I think the question is about the calibration dialog. That is, you want to assign an energy shift, but not referenced to the edge energy position. Why can't you just set the energy shift by hand on Athena's main page? 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/ ------------------------------ Message: 3 Date: Mon, 8 Sep 2008 13:59:42 -0400 From: "Anatoly Frenkel" Subject: Re: [Ifeffit] enrgy-axis-expansion To: "'XAFS Analysis using Ifeffit'" Message-ID: <20080908175744.9B7E429C12@fe6.prod.mis.yu.edu> Content-Type: text/plain; charset="us-ascii" 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