IMRAM

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

東北大学
多元物質科学研究所

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

    東北大学多元物質科学研究所
    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

    分子科学
    電子衝突物理
    コンプトン散乱
    時間分解分光
    Molecular science
    Electron collision physics
    Compton scattering
    Time-resolved spectroscopy
研究テーマ
Research Subject
電子衝突を用いた静的および動的分子科学
Molecular science using electron collisions from the static to the time-resolved regime

研究の背景 Background

分子科学は、分子を深く知り、分子を司る原理を学んで、それらを自在に操ることを究極の目標とします。分子がつくりだす多種多様な自然現象の源を探る分子科学は、物質科学から生命・宇宙科学にわたる自然科学の広範な研究分野や工学・医学など我々の生存を支える多くの学問の基礎となるものです。

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

分子科学を独自の切り口で推進するために、電子衝突を利用しています。具体的には、（１）幅広い移行運動量領域にわたる電子－分子衝突の立体ダイナミクス、（２）分子軌道形状の運動量空間における3次元観測、（３）化学反応を根源的に司る分子軌道の変化の時間分解スナップショット撮影、の３つの課題を主に研究を進めています。

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.

研究者HP