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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