田原分子分光研究室 Molecular Spectroscopy Laboratory


Spectroscopy is the "eyes" of modern science, and hence it plays essential roles in a variety of research fields covering physics, chemistry, and biology. We develop and utilize the most advanced spectroscopy for molecular science of complex systems in the condensed phase. To elucidate a variety of complex phenomena occurring in the condensed phase, we need to clarify the electronic and vibrational states of molecules, the response of surroundings, and the fluctuation and dissipation of energy behind. Based on this view, we carry our fundamental research using the most advanced linear/nonlinear spectroscopic methods with most suitable time- and space-resolution for the problems to be studied.

Director: Tahei Tahara



Observation and elucidation of ultrafast molecular dynamics by advanced time-resolved spectroscopy
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.



Developments of novel inteface-selective nonlinear spectroscopies and elucidations of molecular mechanisms of interfacial phenomena
Emergences of novel experimental techniques often open new doors for finding new phenomena as well as unknown mechanisms, especially for microscopic elucidations. In our group, by developing new techniques based on the even-order nonlinear optics, we investigate the structures and dynamics of molecules at interfaces. Our studies are opening up a new field of interfacial science.



Development of novel single-molecule methods and application to elucidate complex behavior of biomolecular systems
The single-molecule spectroscopy group is engaged in the development of new methods of single-molecule fluorescence spectroscopy and related photon data analysis. By utilizing the developed methods, we investigate the complex behavior of biomolecular systems, such as proteins, nucleic acids, and lipid membranes. Through the integrated approach of laser spectroscopy, biophysical chemistry, and statistical data analysis, we pursue creating a new field of molecular science.


Reorientation-induced relaxation of free OH at the air/water interface revealed by ultrafast heterodyne-detected nonlinear spectroscopy

K. Inoue, M. Ahmed, S. Nihonyanagi, and T. Tahara, Nat. Communs. 11, 5344 (2020).

Tracking photoinduced Au–Au bond formation through transient terahertz vibrations observed by femtosecond time-domain Raman spectroscopy

H. Kuramochi, S. Takeuchi, M. Iwamura, K. Nozaki, and T. Tahara, J. Am. Chem. Soc. 141, 19296-19303 (2019).

Microsecond conformational dynamics of biopolymer revealed by dynamic-quenching two-dimensional fluorescence lifetime spectroscopy with single dye-labeling

B. Sarkar, K. Ishii, and T. Tahara, J. Phys. Chem. Lett. 10, 5536-5541 (2019).

Probing the early stages of photoreception in photoactive yellow protein with ultrafast time-domain Raman spectroscopy

H. Kuramochi, S. Takeuchi, K. Yonezawa, H. Kamikubo, M. Kataoka, and T. Tahara, Nat. Chem. 9, 660-666 (2017).



  • 2021-04-16
    Nature Chemistry picked our time-resolved HD-VSFG study of ultrafast photoreaction dynamics on the water surface for the cover of the April issue.
  • 2020-02-12
    Prof. Tahara has received Mizushima-Raman Lecture Award, “in recognition of his outstanding contribution to Chemistry in the area of molecular spectroscopy,”
  • 2020-02-12
    Prof. Tahara gave a invited lecture at Mizushima Raman Lecture, 26th CRSI National Symposium in Chemistry (NSC-26) (2020/02/08, Vellore, India)
  • 2019-11-07
    Prof. Tahara gave a keynote lecture at Nature Conference on Functional Dynamics -Visualizing Molecules in Action (2019/11/06-08, Arizona, USA)