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SUMMARY:Physical Chemistry Seminar 228: Scott Cushing
DESCRIPTION:Prof. Cushing Flyer \nTitle: From Batteries to Photoelectrochemistry: Exploring Ultrafast Phenomena with Electrons\, X-rays\, and Entangled Photons \nAbstract: The Cushing lab focuses on ultrafast instrumentation building that ranges from tabletop X-rays\, entangled photon spectroscopy\, ultrafast TEM/EELS\, to new forms of battery spectroscopy. In this talk\, I will give a brief introduction to our research areas\, mentioning the increasingly “null” space explored with entangled photons\, and then focus on two of the techniques – table top X-ray spectroscopy and our newly created laser-driven ultrafast impedance method. First\, we use transient X-ray techniques to element-specifically explore complex photodynamics in solar to fuel and other solid-state systems. The ultrafast X-ray pulses measure a mix of electronic and structural dynamics\, and using our excited state Bethe-Salpeter equation approach\, we can extract everything from time-resolved electron and hole energies\, defect state occupations\, phonon and polaron modes\, and transport in multi-layer junctions. New examples include measuring a lattice’s coherent response to polaron formation and dynamic localization in superatomic crystals. Second\, we use our newly developed\, laser-driven ultrafast impedance method to investigate the ion hopping Hamiltonian of superionic conductors. Picosecond temporal and spectral correlations differentiate electron-ion\, electron-phonon\, and even potentially ion-ion interactions. Follow up transient XUV studies can then give an atomistic view of how material parameters control solid-state electrolyte and electrode performance.
URL:https://www.chemistry.ucla.edu/events/physical-chemistry-seminar-228-scott-cushing/
LOCATION:Mani L. Bhaumik Centennial Collaboratory\, 607 Charles E. Young Dr.\, East\, Los Angeles\, CA\, 90095\, United States
CATEGORIES:Physical Chemistry Seminar
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