Re: [Ifeffit] Ifeffit Digest, Vol 178, Issue 9

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 chantler@unimelb.edu.auhttps://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40unimelb.edu.au chantler@me.comhttps://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=mailto%3achantler%40me.com http://optics.ph.unimelb.edu.au/~chantler/xrayopt/xrayopt.htmlhttps://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=http%3a%2f%2foptics.ph.unimelb.edu.au%2f%7echantler%2fxrayopt%2fxrayopt.html http://optics.ph.unimelb.edu.au/~chantler/home.htmlhttps://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdAITgSrfUpfDAUV5oUH1LFYBcz08w8xvHMJoosZRdagfQM.&URL=http%3a%2f%2foptics.ph.unimelb.edu.au%2f%7echantler%2fhome.html ________________________________ From: Ifeffit on behalf of ifeffit-request@millenia.cars.aps.anl.gov Sent: Monday, 11 December 2017 5:00:01 AM To: ifeffit@millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 178, Issue 9 Send Ifeffit mailing list submissions to ifeffit@millenia.cars.aps.anl.gov To subscribe or unsubscribe via the World Wide Web, visit http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit or, via email, send a message with subject or body 'help' to ifeffit-request@millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-owner@millenia.cars.aps.anl.gov When replying, please edit your Subject line so it is more specific than "Re: Contents of Ifeffit digest..." 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 To: "ifeffit@millenia.cars.aps.anl.gov" Subject: [Ifeffit] Units for density in Athena's Booth self-absorption correction? Message-ID: 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