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  • Ken Onda, Professor
Our research interests are in the area of ultrafast spectroscopy of chemical reactions. Chemical reactions are the phenomena that materials are changed into other materials and their processes occur in the temporal range from femtosecond (10−15 sec.) to millisecond (10−3 sec.). Using ultrashort pulse lasers, we develop various types of time-resolved spectroscopy systems and investigate various functional materials, such as artificial photosynthesis and organic electronic devices, in-situ and in realtime.

1. Photochemical processes in transition metal complexes

Transition metal complexes are widely used in photofunctional materials, such as artificial photosynthesis, organic solar cells, fluorescent probes, and organic photosynthesis, as key components. We investigate the photo-excited processes in these metal complexes using mainly time-resolved infrared vibrational spectroscopy and reveal many fundamental processes that play important roles in functional materials.

Figure 1

2. Photoinduced processes in molecular crystals

Molecular crystals are promising materials for novel organic electronic devices because they possess unique physical properties coming from periodic inter-molecular interactions. We investigate a wide variety of photoinduced processes in organic semiconductors by a combination of different types of ultrafast spectroscopic techniques.

Figure 2

3. Catalytic reaction processes in heterogeneous catalysts

Heterogeneous catalysts are of importance for industrial chemical synthesis; however, it is very difficult to understand the reaction dynamics in the molecular level because the reactions occur at rough and complex surfaces. We develop time-resolved non-linear spectroscopy systems applicable to such surface reactions and observe short-lived states and species in the catalytic reactions.

Figure 3