Suppose the mono is being used at the 333 reflection (for Si), intentionally working at the 3rd harmonic. In that case, if the fundamental isn't filtered out, you could get just what we see, with the sample doing the filtering before the beam gets to the transmission chamber.
        mam

On 6/14/2023 9:16 PM, Anatoly Frenkel wrote:
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
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