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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Optically-active vibrational sum-frequency generation spectroscopy of chiral molecules in isotropic liquid

2018년 8월 31일 09시 15분 51초
PHYS.P-326 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Taegon Lee, Sanghee Nah, Jun-taek Oh1, Hanju Rhee*
Seoul Center, Korea Basic Science Institute, Korea
1Korea Basic Science Institute, Korea
Chiral molecule plays an important role in chemistry, biology and medicine, and its stereo-chemical structure sometimes critically affects its biochemical activity. Various chiroptical methods such as circular dichroism (CD), vibrational CD (VCD), and Raman optical activity (ROA) have been extensively used to determine stereo-specific structures of chiral molecules. Recently, we developed a chiral vibrational sum-frequency generation (VSFG) technique capable of distinguishing between optically-active vibrational features of enantiomers in isotropic liquid. By employing narrowband near IR and broadband mid-IR laser beams, we could obtain the chiral VSFG spectrum in the C-H stretching frequency region of limonene without any frequency scan of the mid-IR beam. It was found that the circular intensity difference (CID) SFG signal is highly sensitive to the vibrational optical activity of two different enantiomers with opposite chirality, allowing distinguishing between them. We also studied the polarization-dependence of the chiral, achiral and CID SFG spectra and found that different polarization combinations of the mid-IR, near-IR and SFG beams lead to the generation of the SFG signals associated with different hyperpolarizability tensors and their interference.