September 2026 - Ifeffit - millenia.cars.aps.anl.gov

[ifeffit] What is the classic literature on the "pinhole effect" or ploydispersivity in transmission mode?
by Gerald T. Seidler 29 Sep '26

29 Sep '26

A student and I are trying to wrap our heads around quantitative estimates for the consequences of the pinhole effect, including just for (not quite pinhole) polydispersity of powders in transmission mode samples. Where should we look for classic literature? Does anyone know work that uses a cumulant approach to polydispersivity effects? With thanks, Jerry -- *Gerald Seidler* *Professor, Physics Department* *University of Washington* *https://urldefense.us/v3/__http://faculty.washington.edu/seidler/index.html__;!!G_uCfscf7eWS!dTcOpFuZT-VDvcBeGkN6dA5hCVD4mkP27eZrR5gcP4cAG8aExc7pxx7BAf6GtF4X1DZEZABGhWkY-wQuiRwmpcvKSNpgtw$ <https://urldefense.us/v3/__http://faculty.washington.edu/seidler/index.html… >* *seidler(a)uw.edu <seidler(a)uw.edu>*

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Re: [ifeffit] What is the classic literature on the "pinhole effect" or ploydispersivity in transmission mode?
by matt.newville＠gmail.com 29 Sep '26

29 Sep '26

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Errors with correcting for overabsorption in Larix 3.1
by le0766＠princeton.edu 17 Sep '26

17 Sep '26

Dear XAFS community, I'm looking to see if anyone else has encountered a problem with correcting for overabsorption in Larix doing XANES data processing. In short, although the overabsorption correction seems to create a corrected fit, when one attempts to save that fit as a new file to evaluate it, the saved file is the exact same as the original -- in other words the overabsorption correction is not being saved properly. This is of importance to me because many of my scans collected at XFM that were collected appear to be overabsorbed in comparison to the standards I collected to create a diagram to quantitatively assess Fe3/total Fe. Therefore, the intensities are routinely exceeding my diagram created from my standards, and I am unable to apply the quantitative analysis. Therefore I believe overabsorption correction will alleviate the abnormally high intensities. Best, Luis

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Application window for SCC-2026 short course at BNL
by Anatoly Frenkel 16 Sep '26

16 Sep '26

Dear all, We have a few more spots left in the course. Although the application window is formally closed, we can accept a few more participants if there is interest. The short course web site is: https://urldefense.us/v3/__https://www.bnl.gov/scc-course/__;!!G_uCfscf7eWS… For inquires how to apply please contact me. Regards, Anatoly ------------------------------------------------------------------- Anatoly I. Frenkel Professor Department of Materials Science and Chemical Engineering Affiliate Professor, Department of Chemistry * Stony Brook University * Stony Brook, NY 11794 Email: anatoly.frenkel(a)stonybrook.edu <https://urldefense.us/v3/__https://mail.bnl.gov/OWA/redir.aspx?C=F6wCGt4adz… > https://urldefense.us/v3/__http://you.stonybrook.edu/frenkel__;!!G_uCfscf7e… Co-Director and Spokesperson, Synchrotron Catalysis Consortium (SCC) at BNL https://urldefense.us/v3/__http://you.stonybrook.edu/scc2__;!!G_uCfscf7eWS!… Joint Appointment: Senior Chemist Chemistry Division, *Brookhaven National Laboratory* Upton, NY 11973 Email: frenkel(a)bnl.gov https://urldefense.us/v3/__https://www.bnl.gov/staff/frenkel__;!!G_uCfscf7e… -------------------------------------------------------------------

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