讲座题目：Laser Spectroscopy for Energy Research
主讲人：Prof. Jinjun Liu
讲座时间：2017.01.06 上午10点
讲座地点:理科大楼A814室
报告人简介：
Prof. Liu received his B.S. degree in physics at East China Normal University in 1999 and worked for two years in the State Key Laboratory of Precision Spectroscopy in Shanghai. For his Ph.D., he studied Chemical Physics at the Ohio State University in Dr. Terry A. Miller's research group. Jinjun received his Ph.D. degree in 2007 and served as a post-doctoral fellow with Dr. Frederic Merkt at the Swiss Federal Institute of Technology (ETH), Zurich. He joined the faculty of Department of Chemistry at the University of Louisville in January, 2012. He is also the Spectroscopy Theme Leader at the Conn Center for Renewable Energy Research. Dr. Liu received a NSF CAREER Award in 2015.
报告摘要：
Sufficiency of energy and cleanliness of environment are necessary preconditions for the existence of human beings, which shall not be taken for granted. Energy research that aims at advancing designs of engines and batteries, improving energy efficiency, and reducing pollutant formation are of critical importance to modern society. Laser spectroscopy techniques constitute a powerful means for understanding the mechanisms of energy production processes: from combustion of fossil fuels, to harvesting solar energy directly.
In the UofL Laser Labs, both high-resolution and ultrafast laser spectroscopy techniques have been employed for energy research. In my talk, two examples will be used to elucidate these techniques: (1) gas-phase high-resolution laser-induced fluorescence (LIF) and dispersed fluorescence (DF) spectra of the t-butoxy radical, an important intermediate of oxidation of hydrocarbons both in the atmosphere and in “low-temperature” combustion, and (2) femtosecond transient absorption (TA) spectra of ligand-passivated (CdSe)34 nanoclusters, which have potential application in novel solar cells. In the former case, experimentally obtained spectra with vibrational and rotational resolution of the electronic transition can be used for unambiguous diagnostics in monitoring the concentrations and reactions of the free radical. Molecular constants obtained from spectral analysis also provide information about the geometry and electronic structure of the radical as well as delicate interactions between the motions of electrons and nuclei. The ultrafast spectra of (CdSe)34 nanoclusters, on the other hand, provide direct measurement of the timescales of electron and hole transfer between the strongly coupled CdSe core and its passivation ligands (phenyldithiocarbamate). Taken together, I hope to convince you that laser spectroscopy is a powerful tool to study the structure and dynamics of molecules and condensed-phase materials as well as photo-induced charge/energy transfer processes.