About us

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About us

 The targeted goal of our research group is to understand and visualize, at the most fundamental level,
the interaction between electron and atomic motions in matter, or the source of beauty and richness of nature the PI believes. To this end, we have been developing various original experimental methods.
 For instance, in the case of photochemical reaction, we carry out development of a real-time
spectroscopic complex, which consists of time-resolved versions of electron momentum
spectroscopy (TR-EMS) and atomic momentum spectroscopy (TR-AMS). TR-EMS measures in real
time the momentum distributions of each electron, bound in a transient, evolving system, with
different ionization energies, thereby enabling one to make a “molecular orbital movie” in
momentum space. The observed change in electron motion would represent the driving force behind
chemical reaction. On the other hand, TR-AMS measures the momentum distributions of each atom,
involved in an evolving system, with different mass numbers, which tells about how and how much
the change in atomic motions are brought about by the change in electron motion. A joint use of
TR-EMS and TR-AMS thus can visualize the driving principle of each gas-phase photochemical reaction
by providing a series of snapshot microscopic views about how and why the atoms are dancing in such a way.
 The PI believes our research group activity contributes to the world’s needs, ranging from the most
fundamental levels of discovery to applications critical to a broad range of fields in science and technology.

Masahiko Takahashi