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DTSTART;TZID="Pacific Time (US & Canada)":20230914T103000
DTEND;TZID="Pacific Time (US & Canada)":20230914T120000
SUMMARY:School of Mechanical and Materials Engineering Seminar Series Presents “Chemistry under Extreme Conditions (XCHEM): Evolution of Chemical Bonding and Crystal Structure of Hot-Dense Solids at Advanced Light Sources” Presented by Dr. Choong-Shik Yoo
LOCATION:Engineering Teaching Research Laboratory (ETRL), Pullman, WA
DESCRIPTION:Presented by\n\nDr. Choong-Shik Yoo, Professor, Department of Chemistry and Institute of Schock Physics, WSU\n\nAbstract\n\nA well-documented body of both experimental and theoretical studies seems to suggest systematic phase/chemical transformations of low Z molecular solids to covalent solids, ionic solids and, eventually, metallic solids under extreme conditions. Inspired by this emerging theme, we have performed an integrated research program of small-scale static and large-scale dynamic high pressure-temperature experiments using synchrotron X-rays, X-ray Free Electron Laser (XFEL) and the National Ignition Facility (NIF), to investigate the evolution of chemical bonding, crystal structure and properties of low Z solids under extreme conditions. In this talk, I will first briefly describe several fundamental principles governing the chemistry of low Z solids under extreme conditions and, then, present our recent results of (i) NIF-Discovery Science Campaign on ramp-compressed NaCl to 1TPa, (ii) MHz time-resolved X-ray diffraction (TR-XRD) at Eu-XFEL to probe the structure evolution of N2 under rapid compression in dynamic-DAC, and (iii) KHz TR-XRD at APS to probe the formation of superionic ice phases under rapid heating in ramp laser-heated DAC.\n\nBiography\n\nProfessor Yoo is Professor of Department of Chemistry and Institute for Shock Physics at Washington State University. His research is focused on addressing fundamental materials problems under extreme pressure-temperature conditions, utilizing static and dynamic high-pressure capabilities coupled with the state-of-the-art laser spectroscopic methods and fast time-resolved x-ray diffraction at advanced 3G(synchrotron) and 4G(XFEL) x-rays and  high-power lasers such as National Ignition Facility at the Lawrence Livermore National Laboratory (LLNL). Prior to his arrival at WSU, he worked at the LLNL where he developed and led a large multi-disciplinary research group in High Pressure Physics. Professor Yoo received his Ph.D. in Physical Chemistry in 1986 from UCLA.
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