Re: [Ifeffit] Origin of noise in Ag K-Edge
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
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 ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd 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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participants (2)
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Robert Gordon -
Sebastian Kunze