[Ifeffit] Ifeffit Digest, Vol 67, Issue 11
Khalid, Syed
khalid at bnl.gov
Tue Sep 9 08:22:14 CDT 2008
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?
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Subject: Ifeffit Digest, Vol 67, Issue 11
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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" <khalid at bnl.gov>
Subject: [Ifeffit] FW: enrgy-axis-expansion
To: <ifeffit at millenia.cars.aps.anl.gov>
Message-ID:
<55C249AA18FE564E86564FEB2412D45BEFD187 at 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 at 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 at bnl.gov
------------------------------
Message: 2
Date: Mon, 8 Sep 2008 13:51:12 -0400
From: Bruce Ravel <bravel at bnl.gov>
Subject: Re: [Ifeffit] enrgy-axis-expansion
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Message-ID: <200809081351.12614.bravel at 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 at 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" <frenkel at bnl.gov>
Subject: Re: [Ifeffit] enrgy-axis-expansion
To: "'XAFS Analysis using Ifeffit'"
<ifeffit at millenia.cars.aps.anl.gov>
Message-ID: <20080908175744.9B7E429C12 at 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 at bnl.gov]
Sent: Monday, September 08, 2008 12:21 PM
To: ifeffit at 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 at bnl.gov
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Message: 4
Date: Mon, 8 Sep 2008 14:13:37 -0400
From: Bruce Ravel <bravel at bnl.gov>
Subject: Re: [Ifeffit] enrgy-axis-expansion
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Message-ID: <200809081413.37559.bravel at bnl.gov>
Content-Type: text/plain; charset="utf-8"
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 at bnl.gov]
> Sent: Monday, September 08, 2008 12:21 PM
> To: ifeffit at 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 at bnl.gov
>
> _______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
--
Bruce Ravel ------------------------------------ bravel at 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: 5
Date: Mon, 8 Sep 2008 22:40:47 +0200
From: "Zajac, Dariusz" <dariusz.zajac at desy.de>
Subject: [Ifeffit] ODP: enrgy-axis-expansion
To: "XAFS Analysis using Ifeffit" <ifeffit at millenia.cars.aps.anl.gov>
Message-ID: <35E004AD6290A7438FCA34BBF325F4160C56CB at ADXV2.win.desy.de>
Content-Type: text/plain; charset="iso-8859-2"
I do not clearly understood what you mean. could you explain it more precisely? do you want to replace the x scale from energy to time?
if you want only set the edge energy use E0
kicaj
________________________________
Od: ifeffit-bounces at millenia.cars.aps.anl.gov w imieniu Khalid, Syed
Wys?ano: Pn 2008-09-08 18:20
Do: ifeffit at millenia.cars.aps.anl.gov
Temat: [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 at bnl.gov
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