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제111회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Excitation-dependent excited-state dynamics of carotenoids by femtosecond transient absorption spectroscopy

등록일
2013년 2월 14일 16시 42분 38초
접수번호
1241
발표코드
PHYS.P-454 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 17일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
이세복, 이인구, 방윤수*
광주과학기술원(GIST) 물리화학부, Korea
Carotenoids play very important roles in photosynthesis such as light harvesting and photo-protection. The carotenoid 8'-apo-β-carotenal contains carbonyl group on one terminal and belongs to Cs symmetry slightly off from the C2h symmetry of most carotenoids. This carotenoid shows very complex excited-state dynamics between three singlet states ; the bright S2 and the dark S1 excited state and the ground S0 state. In this research, we will investigate excitation dependent excited state dynamics of 8'-apo-β-carotenal by using 400nm and 500nm excitation pulses in femtosecond transient absorption measurements. To measure transient absorption signal, two femtosecond laser pulses, pump and probe pulses, are required. Pump pulses which excites carotenoids’ S2 excited state are generated by the second harmonic generation of fundamental pulses in a BBO crystal and by a noncollinear optically parametric amplifier (tunable between 450nm and 650nm). Probe pulses generated by white light generation in a sapphire window covers a broad range of wavelengths between 450 nm and 750nm. By changing time delay between two pulses, we can measure time-dependent transient absorption intensities and excited-state dynamics of the carotenoid down to 50fs time resolution can be obtained by analyzing the transient absorption results.

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