HI Mike, it is dilute Pd in Au nanoparticles deposited on SiO2 with about
5% metal weight loading.
In my view, the lack of curvature in transmission (the original problem in
my post) is a simple consequence of two opposite trends, 1) the curving up
of the transmission signal by the same reason
A question because I'm not really super clear on how harmonics work: (I'll get to the question in a moment...) I note that I0 starts to go non-linear around 12200-12400 eV and stays that way. So an increase (proportional?) in the amount of signal in It might be happening at around the same
Hi Anatoly,
I think Robert or Matthew made this point, but if set up for Pd, the mirror
angle may have been chosen to reject ~70 keV, but possibly not 36 keV --
the harmonic at the Au edge. Do you know what the mirror angle was?
The Ar-filled I0 would be very efficient at absorbing 12 keV, and
But collimating mirror is in the front end. AnatolyOn Jun 15, 2023, at 10:52 AM, Carlo Segre wrote:I would have guessed that the increase in I0 is primarily due to Pt fluorescence. The yield does increase as the energy rises.CarloOn Thu, Jun 15, 2023 at 9:45 AM Matt Newville
Thank you, Matt. Ion chambers were filled with 90% Ar, and Pt coating was used, because we were measuring Pd K edge for the project, but we decided to look at the Au edge for testing purposes. AnatolyOn Jun 15, 2023, at 10:45 AM, Matt Newville wrote:I'm not sure why the intensity would go up
I would have guessed that the increase in I0 is primarily due to Pt
fluorescence. The yield does increase as the energy rises.
Carlo
On Thu, Jun 15, 2023 at 9:45 AM Matt Newville
wrote:
> I'm not sure why the intensity would go up unless the ion chamber was
> poorly set up. But, as others
I'm not sure why the intensity would go up unless the ion chamber was
poorly set up. But, as others have pointed out, the mirror reflectivity
for a Pt mirror should not change significantly over this energy range -
the energy range is not that close to the Pt L3 or L2 edges.Depending
on
Thank you, Robert, Matthew, Jeff, Kirill, Terry and Sirine for great
suggestions.
I initially thought that the explanation for the linearity or the transmission
signal is a superposition of two opposite trends: 1) increase of flux with
energy due to the mirror effect and 2) similar decrease
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--
Message: 3
Date: Wed, 14 Jun 2023 23:09:45 -0700
From: matthew marcus
To: ifeffit@millenia.cars.aps.anl.gov
Subject: Re: [Ifeffi
The mirror was set up for a run at the Pd K-edge, according to the
problem statement. Therefore, its nominal angle must be such as to put
the critical energy >25keV. An angle of 3mrad would do it. At that
angle, the reflectivity (assuming no roughness) goes up with energy in
the relevant
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