Thank you, Matthew and Robert, but I think the explanation is more simplle. The fact that there are peaks in I0 and dips in transmission is a clue that explains why transmission is almost linear while I0 curves up.
Anatoly > On Jun 14, 2023, at 11:34 PM, matthew marcus <mamar...@lbl.gov> wrote: > > One thing that's pretty odd is that the glitches are peaks in I0, and dips > in It. It would be much easier to explain if It was the one that increased > steeply and I0 was more linear, but the presence of the edge in It shows that > you didn't switch them. Red = It. What's that sudden drop at the end? > > Could it be that the I0 chamber is misaligned so that beam is scraping one of > the plates? That could cause all sorts of odd things to happen. > mam > >> On 6/14/2023 5:27 PM, Anatoly Frenkel wrote: >> Hello, all. It is a low- to medium- level brain teaser. >> Pt-coated collimating mirror was in place for Pd K-edge measurement, but Au >> L3-edge of Pd-Au alloy was measured (for testing purposes). I0 and It >> detectors were both Ar filled ionization chambers. Because of the energy >> dependence of reflectivity of the Pt mirror, I0 intensity was strongly >> nonlinear (blue curve). However, the transmission intensity in the It >> detector was almost linear (red curve). Why? >> Anatoly >> image.png >> _______________________________________________ >> 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 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 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
