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DTSTART;TZID=America/Los_Angeles:20200413T090000
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DTSTAMP:20260718T150611
CREATED:20200512T034144Z
LAST-MODIFIED:20200512T035931Z
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SUMMARY:Jacinto Sa:	Solving chemical mechanisms with X-ray spectroscopy
DESCRIPTION:As a scientist have been always fascinated with how chemical systems react and interact with the natural world. Spectroscopy is a great tool to look at systems in real-time and operation conditions. Hard X-ray photon-in photon-out spectroscopy offers great possibilities due to its chemical sensitivity and speciation as well as high penetration. In this webinar\, I will talk about two chemical processes and the developments in X-ray spectroscopy that made the studies possible. My studies have been made possible with the development of the dispersive von Hamos-type spectrometer (1)\, which enabled us to perform high-resolution studies on real systems due to its simple and versatile geometry. The first case study is called atomic telemetry\, a method that enables us to follow chemotherapy drugs action mechanism under physiological conditions. The methodology was validated with a known drug (cisplatin) but in this webinar\, I will present the findings from a drug (Pt-103) with an unknown action mechanism (2). The second case relates to the understanding of plasmonic materials hot carrier formation\, and their importance to solar applications. Using synchrotron radiation and HR-XAS we were able to demonstrate for the first time the formation of hot electrons (3). However\, to address their dynamics one needed to develop a way to perform RIXS measurements at the XFEL with the shortest and most intense X-ray pulses. I will show how we can do that (4) and what we plan to do with this methodology. \nReferences: (1 ) J. Szlachetko et al. Rev. Scie. Instrum. 2012\, 83\, 103105 https://doi.org/10.1063/1.4756691  (2 ) J. Czapla-Masztafiak et al. J. Phys. Chem. Lett. 2017\, 8\, 805-811 https://doi.org/10.1021/acs.jpclett.7b00070 (3) J. Sá\, et al. Energy Scie. Technol. 2013\, 6\, 3584-3588 https://doi.org/10.1039/C3EE42731E (4) Y. Kayser et al. Nat. Commun. 2019\, 10\, 4761 https://doi.org/10.1038/s41467-019-12717-1
URL:https://xrayabsorption.org/events/jacinto-sasolving-chemical-mechanisms-with-x-ray-spectroscopy/
CATEGORIES:XAFS Journal Club
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