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Then Matt's suggestion of having changed the uniformity ... Are you using a focused beam/small beam size?
A small amount of motion of beam or sample relative to the other could move you on or off a cluster.

Transmission signal should show more noise then, but not I0.

You could try a larger beam, or rotating the sample a bit to have a larger footprint...greater effective thickness
and better averaging over non-uniformity.

-R.

On 2024-04-30 8:35 a.m., Sebastian Kunze wrote:

Dear Shelly, Robert, Matt, thank you for your kind replies, I think I should give more information about the measurement. The sample is a sealed battery anode consisting of silver particles that should undergo alloying with Lithium during

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Dear Shelly, Robert, Matt,

thank you for your kind replies, I think I should give more information about the measurement.

The sample is a sealed battery anode consisting of silver particles that should undergo alloying with Lithium during charging. This is done at constant temperature and applied pressure. I repeated this experiment under different conditions several times, and each time there is less noise before a certain time during the charging process, after which is persists even when the battery is at rest (not charging/discharging). I0 also did not fluctuate much, and the integration time for each point is indeed the same. Therefore I think it is not instrumental, but rather something happening in the sample. As you can see from the spectra, the silver particles experience a strong decrease of uniform structure when they lithiate. For me, this at least explains why the noise in the post-edge increases, but can it also explain the noise in the edge and pre-edge?

In any case, thank you very much for your answers!

Best,

Sebastian
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