Institute of Multidisciplinary Research for Advanced Materials, Tohoku University


LAST UPDATE 2021/05/07

  • 研究者氏名
    Researcher Name

    高橋正彦 Masahiko TAKAHASHI
    教授 Professor
  • 所属
    Professional Affiliation

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    マテリアル・計測ハイブリッド研究センター 量子電子科学研究分野
    Materials-Measurement Hybrid Research Center, Quantum Electron Science
  • 研究キーワード
    Research Keywords

    Molecular science
    Electron collision physics
    Compton scattering
    Time-resolved spectroscopy
Research Subject
Molecular science using electron collisions from the static to the time-resolved regime

研究の背景 Background


The goal of molecular science is to know molecules, to learn principles that govern fundamental properties of molecules, and to manipulate those as desired. Molecular science also seeks the origins of various phenomena that molecules create, and it therefore forms the basis for a broad range of natural sciences such as material, life and space sciences as well as other academic disciplines including engineering and medicine, which are essential to building better human lives.

研究の目標 Outcome


Electron impact is used for advancing molecular science in a fashion unique to ourselves. Specifically, experimental studies on the following three subjects have been made and will be done: (1) stereodynamics of electron-molecule collision at a wide range of momentum transfers from the dipole to the Compton regime, (2) observation of spatial patterns of molecular orbitals in momentum space and in the 3-dimensional form, and (3) time-resolved imaging of molecular orbitals during chemical reactions.

研究図Research Figure

Fig.1. A 3-dimensinal pot of the oscillator strength distribution of He as a function of energy loss and momentum transfer, which is called the Bethe surface. Fig.2. An electron-electron-fragment ion triple coincidence apparatus to look at molecular orbitals in momentum space and in the 3-dimensional form. Fig.3. A new experimental method, which is called timeresolved electron momentum spectroscopy and employs ultrashort laser and electron pulses in a pump/probe scheme. This method aims to enable one to take a series of snapshots of molecular orbitals changing rapidly during chemical reaction,

文献 / Publications

Bull. Chem. Soc. Japan, 82, 751-777 (2009). 日本物理学会誌, 69 巻, 1 号,18-23 (2014). 光アライアンス, 25 巻, 12 号, 41-46 (2014). Phys. Rev. Lett. 94, 213202 (2005). Phys. Rev. Lett. 98, 013201 (2007). Phys. Rev. Lett. 108, 173201 (2012). Phys. Rev. Lett. (2015), in press.