Sum Frequency Generation (SFG) spectroscopy is a second-order nonlinear vibrational spectroscopic technique with surface/interface selectivity, sub-monolayer sensitivity, and femtosecond to picosecond temporal resolution. By leveraging the tunable wavelength and high flux of infrared free-electron laser (IRFEL), combined with experimental condition controls (such as in-situ, temperature and voltage), this platform has been established multiple experimental methods including gas-solid catalysis under elevated temperatures, gas-solid photocatalysis, solid-liquid electrochemistry and time-resolved SFG spectroscopy. It can provide the spectral characterization and ultrafast dynamics investigation in fields of materials science, monitoring chemical reaction intermediate species, energy catalysis and biomedicine. Research areas include:

    lVibrational spectroscopy of organic molecules

    lMonitoring the intermediate species of chemical reaction

    lSurface structure characterization and molecular orientation

    lUtrafast dynamics

Parameters:

lSpectral range: 4000~500 cm-1

lSpectral resolution: ~5 cm-1

lTime resolution: Picosecond level (3.0 ps@λIRFEL=8.35 μm, 0.3 ps@tabletop laser)

Contact: 

Dr. Wei Guo (guowei2022@ustc.edu.cn)