[Ifeffit] Ifeffit Digest, Vol 178, Issue 9

Christopher Thomas Chantler chantler at unimelb.edu.au
Sun Dec 10 15:30:55 CST 2017


Dear all


The two best tests of any self-absorption correction are


  1.  that the resulting curve looks like an absorption curve, and the slope is consistent with one above the edge and
  2.  the pixels in a two-dimensional detector are consistent with such a pixel-dependent correction without excessive fitting parameters. That is, the pixel geometry is corrected for. It is not trivial to do this with a single channel, pixel or spectrum.

Chris


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Christopher Chantler, Professor, FAIP, Fellow American Physical Society
Editor-in-Chief, Radiation Physics and Chemistry
Chair, International IUCr Commission on XAFS CIT, CCN
President, International Radiation Physics Society
School of Physics, University of Melbourne
Parkville Victoria 3010 Australia
+61-3-83445437 FAX +61-3-93474783
chantler at unimelb.edu.au<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40unimelb.edu.au> chantler at me.com<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40me.com>
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From: Ifeffit <ifeffit-bounces at millenia.cars.aps.anl.gov> on behalf of ifeffit-request at millenia.cars.aps.anl.gov <ifeffit-request at millenia.cars.aps.anl.gov>
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Subject: Ifeffit Digest, Vol 178, Issue 9

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Today's Topics:

   1. Units for density in Athena's Booth self-absorption
      correction? (John Christopher Lin)
   2. Re: Units for density in Athena's Booth self-absorption
      correction? (Matt Newville)


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Message: 1
Date: Sun, 10 Dec 2017 02:30:05 +0000
From: John Christopher Lin <jlin9 at stanford.edu>
To: "ifeffit at millenia.cars.aps.anl.gov"
        <ifeffit at millenia.cars.aps.anl.gov>
Subject: [Ifeffit] Units for density in Athena's Booth self-absorption
        correction?
Message-ID:
        <MWHPR02MB3358E7D14D4E058A9F44C79F8F360 at MWHPR02MB3358.namprd02.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

Dear XAFS community,


I am trying to use the Booth algorithm to correct for self-absorption in Athena, and one of the input fields is for the density of the material.  What units should be used for the density in that field?  (I could not find the answer in Section 9.9 of the Athena documentation on self-absorption approximations.)


Many thanks,

John
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Message: 2
Date: Sat, 9 Dec 2017 20:41:32 -0600
From: Matt Newville <newville at cars.uchicago.edu>
To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
Subject: Re: [Ifeffit] Units for density in Athena's Booth
        self-absorption correction?
Message-ID:
        <CA+7ESbpKMvOeJbJD+xDnqXvS+j_-wN+09zbGSb6H7X5K5LdNWQ at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

On Sat, Dec 9, 2017 at 8:30 PM, John Christopher Lin <jlin9 at stanford.edu>
wrote:

> Dear XAFS community,
>
>
> I am trying to use the Booth algorithm to correct for self-absorption in
> Athena, and one of the input fields is for the density of the material.
> What units should be used for the density in that field?  (I could not find
> the answer in Section 9.9 of the Athena documentation on self-absorption
> approximations.)
>

grams per cubic centimeter.


--Matt
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