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<p style="margin-top:0;margin-bottom:0">Dear all</p>
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<p style="margin-top:0;margin-bottom:0">The two best tests of any self-absorption correction are
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<li>that the resulting curve looks like an absorption curve, and the slope is consistent with one above the edge and</li><li>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.</li></ol>
<br>
Chris<br>
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<div>--------------------------------------------------------------------------------------</div>
<div>Christopher Chantler, Professor, FAIP, Fellow American Physical Society</div>
<div>Editor-in-Chief, Radiation Physics and Chemistry</div>
<div>Chair, International IUCr Commission on XAFS CIT, CCN</div>
<div>President, International Radiation Physics Society</div>
<div>School of Physics, University of Melbourne</div>
<div>Parkville Victoria 3010 Australia</div>
<div>+61-3-83445437 FAX +61-3-93474783</div>
<div><a href="https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40unimelb.edu.au" target="_blank" id="LPNoLP">chantler@unimelb.edu.au</a>
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chantler@me.com</a></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Ifeffit <ifeffit-bounces@millenia.cars.aps.anl.gov> on behalf of ifeffit-request@millenia.cars.aps.anl.gov <ifeffit-request@millenia.cars.aps.anl.gov><br>
<b>Sent:</b> Monday, 11 December 2017 5:00:01 AM<br>
<b>To:</b> ifeffit@millenia.cars.aps.anl.gov<br>
<b>Subject:</b> Ifeffit Digest, Vol 178, Issue 9</font>
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Today's Topics:<br>
<br>
   1. Units for density in Athena's Booth self-absorption<br>
      correction? (John Christopher Lin)<br>
   2. Re: Units for density in Athena's Booth self-absorption<br>
      correction? (Matt Newville)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sun, 10 Dec 2017 02:30:05 +0000<br>
From: John Christopher Lin <jlin9@stanford.edu><br>
To: "ifeffit@millenia.cars.aps.anl.gov"<br>
        <ifeffit@millenia.cars.aps.anl.gov><br>
Subject: [Ifeffit] Units for density in Athena's Booth self-absorption<br>
        correction?<br>
Message-ID:<br>
        <MWHPR02MB3358E7D14D4E058A9F44C79F8F360@MWHPR02MB3358.namprd02.prod.outlook.com><br>
        <br>
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<br>
Dear XAFS community,<br>
<br>
<br>
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.)<br>
<br>
<br>
Many thanks,<br>
<br>
John<br>
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<br>
Message: 2<br>
Date: Sat, 9 Dec 2017 20:41:32 -0600<br>
From: Matt Newville <newville@cars.uchicago.edu><br>
To: XAFS Analysis using Ifeffit <ifeffit@millenia.cars.aps.anl.gov><br>
Subject: Re: [Ifeffit] Units for density in Athena's Booth<br>
        self-absorption correction?<br>
Message-ID:<br>
        <CA+7ESbpKMvOeJbJD+xDnqXvS+j_-wN+09zbGSb6H7X5K5LdNWQ@mail.gmail.com><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
On Sat, Dec 9, 2017 at 8:30 PM, John Christopher Lin <jlin9@stanford.edu><br>
wrote:<br>
<br>
> Dear XAFS community,<br>
><br>
><br>
> I am trying to use the Booth algorithm to correct for self-absorption in<br>
> Athena, and one of the input fields is for the density of the material.<br>
> What units should be used for the density in that field?  (I could not find<br>
> the answer in Section 9.9 of the Athena documentation on self-absorption<br>
> approximations.)<br>
><br>
<br>
grams per cubic centimeter.<br>
<br>
<br>
--Matt<br>
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End of Ifeffit Digest, Vol 178, Issue 9<br>
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