Re: [Ifeffit] enrgy-axis-expansion

[Bruce Ravel]

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   [EMAIL PROTECTED]

 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/

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Re: [Ifeffit] enrgy-axis-expansion

[Anatoly Frenkel]

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:[EMAIL PROTECTED] 
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: [EMAIL PROTECTED]

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