Hi Yang, The Mn standard reference "foil" is not good for S02 calculation. You are better off using a Mn sample that has the same kind of local environment as your unknown materials. If you have oxides, then get a good Mn-oxide reference material and use that. Carlo On Sat, May 14, 2022 at 6:34 AM Matt Newville wrote:

Hi Yang,

On Thu, May 12, 2022 at 1:29 PM Hu, Yang (HIU) wrote:

...

Dear IFEFFIT members,

I have been trying to obtain the S02 value from metal reference foils measured at the beamline.

How was your sample Mn metal prepared? Do you have verification that it is metallic?

When you say "from metal reference foils measured at the beamline.", I wonder if that might be the same kind of "reference foil set" in the wooden jewelry box that we have at our beamline. Most of these are very good, while some (Pb) degrade over time. Ours has one labeled "Mn" which is obviously a black powder, probably sintered. I've never tried to analyze that as BCC Mn and assumed it was stable-ish, but not metallic. But maybe someone else has tried that.

--Matt _______________________________________________ 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

-- Carlo U. Segre (he/him) -- Duchossois Leadership Professor of Physics Professor of Materials Science & Engineering Director, Center for Synchrotron Radiation Research and Instrumentation Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 segre@iit.edu http://phys.iit.edu/~segre segre@debian.org

Dear Matt, According to the beamline scientist, it was a Mn metal foil (bcc shown at the supplier's website). Best regards, Yang -----Original Message----- From: Matt Newville [mailto:newville@cars.uchicago.edu] Sent: Saturday, May 14, 2022 1:34 PM To: XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] structure for reference Mn foil Hi Yang, On Thu, May 12, 2022 at 1:29 PM Hu, Yang (HIU) mailto:yang.hu@kit.edu > wrote: Dear IFEFFIT members, I have been trying to obtain the S02 value from metal reference foils measured at the beamline. How was your sample Mn metal prepared? Do you have verification that it is metallic? When you say "from metal reference foils measured at the beamline.", I wonder if that might be the same kind of "reference foil set" in the wooden jewelry box that we have at our beamline. Most of these are very good, while some (Pb) degrade over time. Ours has one labeled "Mn" which is obviously a black powder, probably sintered. I've never tried to analyze that as BCC Mn and assumed it was stable-ish, but not metallic. But maybe someone else has tried that. --Matt