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


--------------------------------------------------------------------------------------
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
chant...@unimelb.edu.au<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40unimelb.edu.au>
 
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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)


----------------------------------------------------------------------

Message: 1
Date: Sun, 10 Dec 2017 02:30:05 +0000
From: John Christopher Lin <jl...@stanford.edu>
To: "ifeffit@millenia.cars.aps.anl.gov"
        <ifeffit@millenia.cars.aps.anl.gov>
Subject: [Ifeffit] Units for density in Athena's Booth self-absorption
        correction?
Message-ID:
        
<mwhpr02mb3358e7d14d4e058a9f44c79f8f...@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 <newvi...@cars.uchicago.edu>
To: XAFS Analysis using Ifeffit <ifeffit@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+09zbgsb6h7x5k5ld...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

On Sat, Dec 9, 2017 at 8:30 PM, John Christopher Lin <jl...@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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