Subject：Ultrafast electronic and structural dynamics study by x-ray free electron lasers
Speaker：Prof. Kiyoshi Ueda
Emcee：Prof. Jian Wu
Time：10:30am, 10th Oct, 2019
Place：Science Building A207
Abstract：
X-ray Free Electron Lasers (XFELs) deliver coherent x-ray pulses, combining unprecedented power densities of up to 1020W/cm2 and extremely short pulse durations down to hundreds of attoseconds. Such intense XFEL pulses make single-shot diffraction of nanometer-size objects, tiny protein crystals, and non-crystalized biomolecules a tangible reality. Such ultrashort XFEL pulses allow us also to visualize temporal variations of charge and structure in femto- to attoseconds time scales, which may occur upon photoexcitation/photoionization in any form of matter. Also, since the XFEL pulses give access to a new regime of x-ray intensities, they open new venues in studying the interaction between intense X-rays and various forms of matter. Understanding the ultrafast reactions induced by the XFEL pulses is of fundamental interest, as well as of crucial importance, for XFEL applications. The present talk will sketch the current status of science studied with XFELs and describe its future directions, referring to the recent developments at various facilities.
About the Speaker:
Degrees:
B. A., Kyoto University Japan, March 1977
Ph. D., Kyoto University, Japan, March 1982
Professional carriers:
Research Associate, Tohoku University, Japan, April 1982 - May 1990
Associate Professor, Tohoku University, Japan, June 1990 - March 2003
Full Professor, Tohoku University, April 2003 - Present
