Thank Dariuz and Bruce. TiO is deposited on Si substrate and PtO is fabricated on TiO2. I measered EXAFS with Pt L3 edge(11563eV) and The model is decided from FEFF8.0. PtO has only fist shell like attached files So I chose the simple model with octahedral structure (probe atom Pt, others O) When the EXAFS was fitted by feffit, the variables were three eo(Enot in Artemis, energy shift), do1(distance factor), sigo1(debye-waller factor). the results of fit is as following variable best fit value uncertainty initial guess eo = 19.283398 1.726426 0.000000 do1 = -0.023227 0.009557 0.096000 sigo1 = 0.003790 0.000583 0.003047 r-factor: 11 reduced-chi square: 95 Energy shift by fit shows an amount of difference from Pt L3 edge. It is my problem. To reduce the energy shift, I tried to remove background carefully again and to change distance Pt-O. However the result was failed. Date: Wed, 5 Oct 2011 08:24:16 +0200 From: kicaj@ifj.edu.pl To: ifeffit@millenia.cars.aps.anl.gov Subject: Re: [Ifeffit] Energy shift Hi, could say more precise what kind of energy shift you are talking about? the position of the white line or the Enot in Artemis. How big it is? Which version of Feff do you use? What do you mean writing "removing background carefully"? Background in the EXAFS fit? Any pictures to illustrate problem are welcome W dniu 11-10-05 03:25, JeongEunSuk pisze: Hell all I have the study for PtO nanoparticles with EXAFS. When I fitted the data to model, I had a problem for energy shift. I thought that the energy shift obtained from fitting must be below White line. However it was over white line. Although I removed background carefully and changed bond length in model, the energy shift was still big. I want to know other factors which affect energy shift. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
