Self absorption. There was a similar question a few weeks ago. Anatoly
Sent from my iPhone > On Jun 22, 2017, at 11:11 AM, Weizi Yuan <weiziyuan2...@u.northwestern.edu> > wrote: > > Dear all, > I have measured some spectra of a CeO2 film(~200nm) grown on Yittria > stablized Zirconia(YSZ) substrate under 2 conditions. > (i) room temperature, ambient atmosphere > (ii) room temperature, vacuum (pO2~1E-6 atm) inside a graphite dome of the > DHS 1100 anton paar, > The spectra are collected in fluorescence mode. The incident angle is 3 o > and the fluorescence collection angle is 90 o. > > My questions are: > (i) From the theory behind the FLUO program developed Dr. Daniel Haskel, CeO2 > spectra collected with a 3 o incident angle would have a strong self > absorption effect and need > > correction , however, the signal is not attenuated compared with the CeO2 > powder taken in a transmission mode, shown in attached plot. > I've gone through many literature and people sometimes tell that whether > they have a successful self absorption correction by comparing the spectrum > with a spectrum taken under a transmission mode. > So I'm wondering if I can say that I don't need a self absorption correction > in this case? > (ii) > The Ce4+ peak in the spectrum collected under condition (ii) has a much lower > intensity. I think it is due to the reduction of Ce 4+ under vacuum, however, > the Ce3+ peak does not show an increased signal here. Which makes ma doubt > whether this is simply reduction of Ce or might be from over absorption? > > Thanks for any response. > > <spectra.jpg> > -- > Regards, > Weizi Yuan, > Graduate Student, > Northwestern University, > Ph:(+1)312-560-9619 > _______________________________________________ > 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
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