[Ifeffit] Brain teaser

[Robert Gordon]

Hi Anatoly,

reflectivity of Pt over that energy range does not vary that much:

[image: image.png]

I guessed what angle you were set for, assuming Pd K-edge...
So something wrong with I0?

-R.


On Wed, Jun 14, 2023 at 5:28 PM Anatoly Frenkel <
anatoly.frenkel at stonybrook.edu> 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: image.png]
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