北京先进光源系列邀请报告 (2)--High Energy-Resolution X-rays and Applications in Materials Science:The Case with Inelastic X-ray Scattering

时间： 2011年7月8日上午9:00　  地点：同步辐射12号厅会议室

High Energy-Resolution X-rays and Applications in Materials Science:The Case with Inelastic X-ray Scattering

Yongqiang Cai

Brookhaven National Laboratory, Upton, NY 11973-5000, USA

The advent of tunable, highly intense and bright synchrotron radiation, and technical advances in the last decades have provided an increasingly powerful source for a broad range of spectroscopic tools, including inelastic x-ray scattering (IXS), for materials research. The construction of dedicated facilities that routinely deliver x-ray beams with µm focal size, energy resolution down to ~meV, and flux on the order of 1010 photons/sec/meV was imperative for the fruitful development of various IXS techniques for the study of lattice dynamics and correlation effects of electrons in many-electron systems. The high penetration depth of hard x-rays offers furthermore unique strength in the study of materials properties under extreme thermal dynamical conditions such as high pressure and extreme temperature. In this presentation, the current status of the IXS techniques will be reviewed and illustrated with examples drawn from high-resolution experiments on a variety of systems, including low-energy charge excitations of a few archetypal materials and materials under the extremes of pressure and temperature. Some perspectives for further developments in the field, particularly in connection with the IXS capabilities planned or being developed at NSLS-II, will also be discussed.

About Prof. Yongqiang Cai

Dec. 2007-present: Physicist and Inelastic X-ray Scattering Group Leader, National Synchrotron Light Source II, Brookhaven National Laboratory (BNL), NY

Jan. 2007-Dec. 2007: Scientist, National Synchrotron Radiation Research Center (NSRRC), Taiwan

Jan. 2003-Dec. 2007: Group Leader, Taiwan Beamlines at SPring-8, NSRRC, Taiwan

Oct. 1998-Dec. 2006: Associate Scientist,NSRRC, Taiwan

Oct. 1998-Oct. 1999: Visiting Scientist, European Synchrotron Radiation Facility, France

Oct. 1997-Oct. 1998: Research Scientist, Japan Science and Technology Corporation (JST), and Institute for Solid State Physics, University of Tokyo, Japan