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报告题目: Studying Ultrafast Dynamics of Free Standing Nanoparticles

报告人: Dr. Wei Xiong, JILA, University of Colorado at Boulder, University of California, San Diego

报告时间:20140415日(周二)下午15:30

报告地点:物理研究所M236会议室

邀请人及联系人:赵继民 副研究员

联系电话: 82649408

 

摘要:

Nanomaterials are revolutionizing both science and technology fields, such as using various nanoparticles assemble advanced nano-architectures. Because of the recent advances of developing nano-devices, it becomes necessary to learn more fundamental knowledge of these nanoparticles, such as electronic structures and dynamics. This information can help us better control the charge flow or generation from the nanoparticles.

In this talk, I will present Nanoscale Velocity Map Imaging spectroscopy, a new method to characterize the electronic structure and dynamics of nanoparticles. By forming nanoparticle stream in the gas phase, the influences from any solvents and substrates are minimized. Therefore, the photoelectrons of nanoparticles are little perturbed. In addition, this new method also eliminates any sample degrading issues, which allows us to study nanoparticle dynamics under extreme conditions, such as nanoplasma explosion.

I will discuss two nano systems we explored: 1) Mapping the interfacial exciton wavefunction and ultrafast charge transfer dynamics in quantum dots, and 2) Observing shock wave formation in a nanoplasma explosion dynamics.  At the end of my talk, I will discuss the recent advances of developing table-top attosecond X-ray light source and the possibility to use it to explore nanoparticle dynamics. 

报告人简介:

Dr. Xiong received his B.S. from Peking University in 2006. He received his PhD degree from University of Wisconsin, Madison in 2011, under the supervision of Prof. Martin Zanni. At UW, Wei developed novel 2D IR and 2D SFG spectroscopies and applied them into different topics. During his postdoc in the Kaptyen–Murnane group at JILA, University of Colorado at Boulder, Wei developed table-top transient soft x-ray spectroscopy to study gas phase dynamics and also developed photoelectron spectroscopy of nanomaterials. Dr. Xiong will start an independent group at the department of Chemistry and Biochemistry in UC San Diego in 2014.

发表于:2014-4-11
 
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