Chemical Dynamics Laboratory
Chief Scientist
Toshinori SUZUKI (D.Sci.)
The fine details of bimolecular chemical reaction dynamics have been experimentally studied by the crossed molecular beam (XMB) method. This sophisticated method measures the (state-resolved) differential cross sections (DCSs), i.e. the scattering and quantum state distributions of reaction products, for well-defined initial states of reagents at controlled collision energies. The DCS and excitation function (the collision energy dependence of the reaction) are valuable in elucidating a reaction mechanism, especially when they are compared with accurate theoretical predictions. On the other hand, the XMB method observes asymptotic states of products and not the dynamics at short inter-particle distances, as in the case of elementary particle physics. The quest for direct experimental observation of electron and nuclear motions in reaction leads us to ultrafast photoelectron spectroscopy of photochemical reactions in gas and liquid phases. We have developed time-resolved photoelctron imaging to capture three dimensional distribution of photoelectron with femtosecond time-resolution in photochemical and photophysical processes in the gas phase. Recently, we have extended our study to liquid phase by coupling photoelectron spectroscopy with liquid beams.
- Ultrafast photoelectron imaging of chemical reactions in gas phase
- Development of ultrafast spectroscopy using free electron lasers
- Crossed molecular beam study of bimolecular reaction dynamics
- Studies on solution chemistry by ultrafast photoelectron spectroscopy of liquids
- Soft X-ray photoelectron spectroscopy of liquids
- November 10, 2008
- Detection of dual reaction pathways for the initial methane oxidation process through the analysis of a visualized image of the scattered 'molecular species, answering the question of whether the reaction proceeds through insertion, or withdrawal, or both
- July 27, 2009
- Change in electronic state that occurs in 50 picoseconds detected using photo-electron imaging technique
- February 15, 2010
- Wave function of photoelectron emitted from molecule elucidated
- April 25, 2008
- Seeing the essence of chemical reactions
- Suzuki, T.:
"Femtosecond time-resolved photoelectron imaging."
Annual Review of Physical Chemistry 57, 555-92 (2006) - Suzuki, Y., and Suzuki, T.:
"Determination of ionization dynamical parameters by time-resolved photoelectron imaging."
Molecular Physics, 105, 1675 (2007). - Suzuki, Y., and Suzuki, T.:
"Photoelectron angular distribution in valence shell ionization of heteroatomatic molecules studied by continuum multiple scattering Xα method."
Journal of Physical Chemistry A, 112, 402-412 (2008). - Kohguchi, H., Suzuki, T., Nanbu, S., Ishida, T., Mil'nikov, G. V., Oloyede, P., and Nakamura, N.:
"Collision energy dependence of O(1D) + HCl → OH + Cl(2P) reaction studied by crossed beam scattering and quasiclassical trajectory calculations on ab initio potential energy surfaces."
Journal of Physical Chemistry A, 112, 818-825 (2008). - Oku, M., Hou, H., Xing, X., Reed, B., Xu, H., Chang, C., Ng, C-Y., Nishizawa, K., Ohshimo, K., and Suzuki, T.:
"3s Rydberg and cationic states of pyrazine studied by photoelectron spectroscopy."
Journal of Physical Chemistry A, 112, 2293-2310 (2008). - Werner, U., Mitric, R., Suzuki, T., and B. Koutecky, V.:
"Nonadiabatic dynamics within the time dependent density functional theory: Ultrafast photodynamics in pyrazine."
Chemical Physics, 349, 319-324 (2008). - Kohguchi, H., Ogi, Y., and Suzuki, T.:
"Reaction mechanism duality in O(1D2) + CD4 →OD + CD3 identified by scattering distributions of rotationally state selected CD3."
Physical Chemistry Chemical Physics, 10, 7222 (2009). - Fuji, T., Suzuki, T., Serebryannikov, E., and Zheltikov, A.:
"Experimental and theoretical investigation of a multicolor filament."
Physical Review A, 80, 063822 (2009). - Tang, Y., Suzuki, Y., Horio, T., and Suzuki, T.:
"Molecular frame image restoration and partial wave analysis of photoionization dynamics of NO by time-energy mapping of photoelectron angular distribution."
Physical Review Letters, 104, 073002 (2010). - Suzuki, Y., Fuji, T., Horio, T., and Suzuki, T.:
"Time-resolved photoelectron imaging of ultrafast S2 -> S1 internal conversion through conical intersection in pyrazine."
Journal of Chemical Physics, in press (2010).