Abstract

Surfaces and interfaces are ubiquitous in Nature. Sum-frequency generation vibrational spectroscopy (SFG-VS) is a powerful surface/interface selective and sub-monolayer sensitive spectroscopic technique to interrogate the vibrational spectroscopy, structure, and conformation, as well as optical activity, and vibrational dynamics of molecular surfaces and interfaces. The difficulties that have limited the application of SFG-VS to broad scientific problems regarding complex surfaces and interfaces, such as the difficulties in spectral assignment, accurate measurement and experimental as well as computational analysis of the SFG spectrum, have been mostly overcome with the recent developments.

This presentation discusses the most recent developments in SFG-VS, particularly on the further development of the quality and sensitivity of the sub-wavenumber high resolution broadband SFG-VS (HR-BB-SFG-VS), and the future perspectives of the applications of SFG-VS as well as other nonlinear vibrational spectroscopy to surface/interface studies and beyond.1,2

References:
[1] Wang, H. F.; Velarde, L.; Gan, W.; Fu, L., Quantitative sum-frequency generation vibrational spectroscopy of molecular surfaces and interfaces: Lineshape, polarization, and orientation. 2015, Annu. Rev. Phys. Chem., 66, 189-216.
[2] Wang, H.-F., Sum frequency generation vibrational spectroscopy (SFG-VS) for complex molecular surfaces and interfaces: Spectral lineshape measurement and analysis plus some controversial issues. 2016, Prog. Surf. Sci., 91, 155-182.

About the Speaker

Prof. WANG Hongfei received his BS in Chemical Physics from the University of Science and Technology of China (USTC) in 1988 and continued his graduate studies in laser chemistry at USTC until 1991. He then obtained his PhD in Physical Chemistry from Columbia University in 1996. After two and a half years of postdoctoral work at the University of Pennsylvania, in collaboration with the DuPont Marshall Laboratory in Philadelphia, he joined the Molecular Reaction Dynamics Laboratory at the Institute of Chemistry, Chinese Academy of Sciences (ICCAS) as a Professor. At ICCAS, he served as the Director of the Molecular Reaction Dynamics Laboratory from 2000 to 2004 and as the Deputy Director of the State Key Laboratory of Molecular Reaction Dynamics during the same period. In 2009, he moved to the US and joined the Environmental Molecular Sciences Laboratory at the Pacific Northwest National Laboratory of the Department of Energy as a Chief Scientist. He returned to China in 2017 and joined Fudan University as a Professor of Chemistry. He later moved to the School of Science at Westlake University, where he is currently a Full Professor of Chemistry.

Prof. Wang's research interests include the structure and reaction dynamics of surface and interface, linear and nonlinear optical spectroscopy and modern analytical spectroscopy. He is mostly known for his "seminal contributions to the development of surface nonlinear vibrational spectroscopy and to the understanding of molecular interaction and structure at interfaces". His most cited paper so far is a systematic survey on the "Quantitative Spectral and Orientational Analysis in Surface Sum Frequency Generation Vibrational Spectroscopy (SFG-VS)". In recent years, he developed the sub-wavenumber high resolution broadband SFG-VS (HR-BB-SFG-VS) and demonstrated its ability for obtaining intrinsic and accurate spectral lineshape in SFG-VS and other nonlinear spectroscopic techniques, such as the Femtosecond Stimulated Raman Spectroscopy (FSRS). 

Prof. Wang was selected into the Hundred Talents Program of the Chinese Academy Sciences (1999-2002) and was awarded the Distinguished Young Investigator Fund of the National Natural Science Foundation of China (2005-2008). In 2012, he was elected a Fellow of the American Physical Society. He was also selected into the High-Level Overseas Talents Program of Shanghai in 2017 and the National High-Level Overseas Talents Program of China in 2018.

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