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Research topics

Development of Heterodyne-Detected Sum Frequency Generation

Sum Frequency Generation (SFG) is widely used as an interface-selective spectroscopic technique. A conventional SFG technique can give only an absolute square of χ⁽²⁾ because of homodyne detection. We are newly developing heterodyne-detected SFG (HD-SFG). This new technique can give complex χ⁽²⁾, which allows us to obtain very detailed information about interfacial molecular structure.

 

• [1] "Direct evidence for orientational flip-flop of water molecules at charged interfaces: a heterodyne-detected vibrational sum frequency generation study", S. Nihonyanagi, S. Yamaguchi, and T. Tahara, J. Chem. Phys. 130 (2009) 204704.
• [2] "Heterodyne-detected electronic sum frequency generation: 'up' versus 'down' alignment of interfacial molecules", S. Yamaguchi, and T. Tahara, J. Chem. Phys. 129 (2008) 101102.