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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Raman-pump power dependent artifact signal of trans-stilbene

2019년 8월 29일 16시 45분 05초
PHYS.P-217 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Physical Chemistry
저자 및
Dong-gu Kang, David W. McCamant1, Sang Kyu Kim*
Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
1Department of Chemistry, University of Rochester, United States
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승인 1건
Femtosecond stimulated Raman spectroscopy (FSRS) is able to monitor the transient vibration modes of molecules within sub-picosecond time scale after photoexcitation. Especially, trans-stilbene and its derivatives which have trans-cis photoisomerization reaction have been variously studied because of large extinction coefficient and Raman activity. We have built above optical setup with a feasible resonant condition (Sn - S1 state) and we performed Raman-pump power dependent experiment of trans-stilbene derivatives with a narrow spectral-resolution (sub-10 cm-1) and a short time-resolution (80 fs). Though the first decay component assigned to intramolecular vibrational redistribution is reported by some groups, we revealed that it is the inevitable artifact of population depletion with high Raman-pump power. To support this results, we also had a non-resonant Raman experiment with Etalon that have a exponential pulse with a cavity lifetime in the time-domain. Therefore, I will present the optimized process for obtaining power-sensitive FSRS signal in resonance condition.