[Ifeffit] Origin of noise in Ag K-Edge

[Matthew Newville]

Sebastian,

What is happening “in situ”?  Are you heating the sample, flowing gas, or changing some other external conditions?

The cleaner spectra are also those with larger oscillations, implying a more uniform local environment. That might suggest that the less clean spectra are from samples with more pinholes or non-uniformity in the bulk distribution of sample particles within the beam.

--Matt

From: Ifeffit <ifeffit-bounces at millenia.cars.aps.anl.gov> on behalf of Sebastian Kunze <sbstnknze at gmail.com>
Date: Monday, April 29, 2024 at 8:21 AM
To: ifeffit at millenia.cars.aps.anl.gov <ifeffit at millenia.cars.aps.anl.gov>
Subject: [Ifeffit] Origin of noise in Ag K-Edge
Greetings, I recently did in-situ QEXAFS at Ag K-edge, expecting to see structure loss starting from crystalline (metallic) state. While we can see that, in addition we also see an increase in noise(?) in the xanes region (compare start and
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Greetings,

I recently did in-situ QEXAFS at Ag K-edge, expecting to see structure loss starting from crystalline (metallic) state. While we can see that, in addition we also see an increase in noise(?) in the xanes region (compare start and end in the attached image). I am confused by this because the amount of material did not change, so I did not expect a difference in the signal/noise ratio at the absorption edge. And it is reproducible across several samples, so not instrument related. Could anyone point me in the right direction as to what I am missing?

Thank you!

Best,
Sebastian Kunze

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