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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Dual frequency comb vibrational optical activity spectroscopy

2019년 8월 23일 00시 10분 53초
PHYS.P-204 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Physical Chemistry
저자 및
HyunMin Jang, Junwoo Kim1, Minhaeng Cho*
Department of Chemistry, Korea University, Korea
1Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science, Korea
It is of great importance to develop techniques to measure optical activity when we investigate biomolecules. Since CD is a extremely weak value, time-resolved CD spectroscopy is experimentally challenging. Here, we demonstrated that it is possible to measure electronic optical activity free-induction-decay (OA-FID) field of tris-(enthylenediamine)3 chloride with dual frequency-comb(DFC). We utilized two phase-locked mode lock lasers whose center frequency is 3100 nm and repetition rate is detuned in slightly different frequency. By measuring parallel FID field in time domain and transforming the measured quantities in time domain into frequency domain via fast Fourier transform by DFC, the complex susceptibility can be obtained, whose imaginary parts and real parts are related to circular dichroism(CD) and optical rotation dispersion(ORD), respectively. By DFC, OA-FID can be measured with simple instrumentation and high data acquisition speed. We anticipate that time-resolved CD spectroscopy with DFC can bring tremendous advantages to the dynamic studies of optically active molecules.