Mapping Ultrafast Chemical Reaction Dynamics with Femtosecond Time-Resolved Time-Domain Raman Spectroscopy
- Online Seminar
- Date: Sep 28, 2020
- Time: 11:00 AM (Local Time Germany)
- Speaker: Prof. Hikaru Kuramochi
- Institute for Molecular Science, Japan
While it provides the
information equivalent to ordinary “frequency-domain” Raman
spectroscopy, the uniqueness of time-domain Raman spectroscopy is that,
by introducing the femtosecond actinic pump pulse prior to the Raman
probing process, it is possible to track structural changes of reaction
intermediates occurring on the femtosecond time scale [1]. Based on this
idea, we developed a time-resolved “time-domain” Raman spectrometer
featuring sub-7-fs pulses, which enables us to track the change of the
vibrational structure over a wide frequency range from the terahertz to
3000 cm-1 region, with femtosecond time resolution and
exquisite sensitivity down to ~1 mOD [2]. With these capabilities, we
succeeded in visualizing ultrafast structural dynamics during not only
fundamental chemical processes such as chemical bond
dissociation/formation [3,4], but also primary events in the
photoreactions of photoresponsive proteins [5-7]. In the talk, we
provide an overview of these studies and discuss the potential and
future of time-domain Raman spectroscopy.
REFERENCE
[1] S. Fujiyoshi, et al, J. Phys. Chem. A 107, 494-500 (2003).
[2] H. Kuramochi et al., Rev. Sci. Instrum. 87, 043107 (2016).
[3] H. Kuramochi et al., Chem. Phys. 512, 88 (2018).
[4] H. Kuramochi et al., J. Am. Chem. Soc. 141, 19296, (2019).
[5] T. Fujisawa, H. Kuramochi et al., J. Am. Chem. Soc. 138, 3942 (2016).
[6] H. Kuramochi et al., Nat. Chem. 9, 660 (2017).
[7] H. Kuramochi et al., Sci. Adv. 5, eaau4490 (2019).
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https://zoom.us/j/99315397763?pwd=ZUV0UGRQMTBxZFVzSzMwR1YxbzRiQT09
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