ULTRAFAST SPECTROSCOPY GROUP
Observation and Control of the Excited State Dynamics of Condensed Phase Molecules by Advanced Spectroscopy Using Ultrashort Optical Pulses
Tracking the molecular dynamics from the electronic and structural viewpoints is essential for deep understanding of chemical reactions. To this end, we develop new ultrafast spectroscopic methods based on basic knowledge on the light-matter interaction and state-of-the-art laser technology. Using these advanced spectroscopy, we aim to observe, understand, and control new fundamental phenomena of reactive molecules.
Elucidating the dynamics of chemical reactions is essential to achieving a deep understanding of the processes involved. With this idea in mind, we study the dynamics of photoexcited molecules via a variety of time-resolved spectroscopic methods utilizing ultrashort laser pulses. We develop new spectroscopic methods based on state-of-the-art laser technology and aim to observe, understand, and control new fundamental phenomena of reactive molecules. Especially for ultrafast reactions, it is key to observe and “visualize” the continuous motion of nuclei (structural change) throughout the reaction. Therefore, we study the “instantaneous” structures of the reacting molecules by advanced multi-pulse experiments, and try to determine the structure of the transition state that plays crucial roles in chemical reactions.
Hikaru Kuramochi (group leader)
- H. Kuramochi; S. Takeuchi; K. Yonezawa; H. Kamikubo; M. Kataoka; T. Tahara
Probing the early stages of photoreception in photoactive yellow protein with ultrafast time-domain Raman spectroscopy
Nat. Chem., 9, 7, 660 – 666 (2017).
- H. Kuramochi; S. Takeuchi; T. Tahara
Femtosecond time-resolved impulsive stimulated Raman spectroscopy using sub-7-fs pulses: Apparatus and applications
Rev. Sci. Instrum., 87, 043107, 1 – 10, (2016).
- T. Fujisawa; H. Kuramochi; H. Hosoi; S. Takeuchi; T. Tahara
Role of coherent low frequency motion in excited state proton transfer of green fluorescenct protein studied by time-resolved impulsive Raman spectroscopy
J. Am. Chem. Soc., 138, 3942 – 3945 (2016).
- S. Tahara; S. Takeuchi; R. Abe-Yoshizumi; K. Inoue; H. Ohtani; H. Kandori; T. Tahara
Ultrafast photoreaction dynamics of a light-driven sodium-ion-pumping retinal protein from Krokinobacter eikastus revealed by femtosecond time-resolved absorption spectroscopy
J. Phys. Chem. Lett., 6, 4481 – 4486 (2015).
- M. Iwamura; K. Nozaki; S. Takeuchi; T. Tahara
Real-time observation of tight Au-Au bond formation and relevant coherent motion upon photoexcitation of [Au(CN)2–] oligomers
J. Am. Chem. Soc., 135, 538 – 541 (2013).