Some of our papers explain how to avoid k-weighting and use the actual measured uncertainties to define a fit.
Other papers by our group explain that a proper k-weighting would scale the value and the uncertainty by the same amount, so that the net fit should be unaffected. Otherwise this is more like a change of the effective k-range over the fit. -------------------------------------------------------------------------------------- Christopher Chantler, Professor, FAIP, Fellow American Physical Society Editor-in-Chief, Radiation Physics and Chemistry Chair, International IUCr Commission on XAFS; CIT, CCN IPP, 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> chant...@me.com<https://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.html<https://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.html<https://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 <ifeffit-boun...@millenia.cars.aps.anl.gov> on behalf of ifeffit-requ...@millenia.cars.aps.anl.gov <ifeffit-requ...@millenia.cars.aps.anl.gov> Sent: Sunday, 16 December 2018 5:00:01 AM To: ifeffit@millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 190, 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-requ...@millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-ow...@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. Question about k-weighting real-world practice and outcomes (John Ferre) ---------------------------------------------------------------------- Message: 1 Date: Fri, 14 Dec 2018 17:53:41 -0800 From: John Ferre <jbfe...@uw.edu> To: ifeffit@millenia.cars.aps.anl.gov Subject: [Ifeffit] Question about k-weighting real-world practice and outcomes Message-ID: <can2qkxtgjyjsep0bhk3qkgqxu4nhcg-4grbok_6c3snfo1-...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Dear EXAFS folk, I'm a graduate student in Jerry Seidler's group at the University of Washington, Seattle. I've been doing a numerical and experimental study on how to optimize k-weighting for EXAFS when the total experimental measurement time for a study is constrained, i.e., when you have 1 hour at some given I0 flux and your job is to get the best results, in terms of best fits or cleanest g(R). Can anyone aim me at 'famous' papers (or at least 'standard' papers) on the best use of k-weighting? Also, it would be great if people could informally email me how they, personally, do k-weighting and what their personal experience has been. My email is jbfe...@uw.edu. Much appreciated! John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://millenia.cars.aps.anl.gov/pipermail/ifeffit/attachments/20181214/e2bec99b/attachment-0001.html> ------------------------------ Subject: Digest Footer _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit ------------------------------ End of Ifeffit Digest, Vol 190, Issue 9 ***************************************
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