Re: [Ifeffit] structure for reference Mn foil
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:newvi...@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...@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 smime.p7s Description: S/MIME cryptographic signature ___ 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
Re: [Ifeffit] structure for reference Mn foil
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
[Ifeffit] structure for reference Mn foil
Dear IFEFFIT members, I have been trying to obtain the S02 value from metal reference foils measured at the beamline. However, I constantly got a very low S02 value, such as 0.2 or 0.3 using Mn alpha or gamma cif file (first shell of 12 Mn). Only Mn-beta (4 subshell * 3 Mn) could give a S02 in the range 0.8 ~ 1, depending on whether I constrained sigam2 for all the 12 Mn or whether I fixed the CN for each subshell. But the uncertainty is very high. I also fitted the MnO measured together leaving S02 variable, and it resulted in a S02 close to 1. So I am guessing I didn't use the correct structure file for Mn foil . I appreciate if someone could help on this! Best regards, Yang Hu smime.p7s Description: S/MIME cryptographic signature ___ 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
