[Ifeffit] Brain teaser

[matthew marcus]

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
> 
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