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
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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@millenia.cars.aps.anl.gov> on behalf of Sebastian Kunze <sbstnknze@gmail.com>
Date: Monday, April 29, 2024 at 8:21 AM
To: ifeffit@millenia.cars.aps.anl.gov <ifeffit@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
This Message Is From an External Sender
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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?