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Physical Chemistry Seminar 228: Scott Cushing

Physical Chemistry Seminar

June 5, 2023 4:00 pm - 5:00 pm
Mani L. Bhaumik Centennial Collaboratory
607 Charles E. Young Dr., East
Los Angeles, CA 90095 United States
Speaker Prof. Scott Cushing


Prof. Cushing Flyer

Title: From Batteries to Photoelectrochemistry: Exploring Ultrafast Phenomena with Electrons, X-rays, and Entangled Photons

Abstract: 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.

Prof. Scott Cushing

Physical Chemistry Seminar

Department of Chemistry and Chemical Engineering

California Institute of Technology