Development of time resolved atomic momentum spectroscopy for visualization of chemical reaction dynamics

2018 Fiscal Year Final Research Report

• Project/Area Number: 15H03762
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Tohoku University
• Principal Investigator: YAMAZAKI Masakazu 東北大学, 多元物質科学研究所, 助教 (00533465)
• Research Collaborator: TAKAHASHI masahiko
• Project Period (FY): 2015-04-01 – 2019-03-31
• Keywords: コンプトン散乱 / 波動関数 / 核波束 / 反応動力学 / 電子分光 / 時間分解分光

Outline of Final Research Achievements

In this study, aiming at visualizing intramolecular atomic motion during a chemical reaction, we have enhanced the potential ability of atomic momentum spectroscopy (AMS) that enables us to investigate momentum distribution of atoms in a molecule by using high-energy electron quasielastic backscattering. As a result, we have successfully developed (1) a highly-sensitive multi-channel apparatus which has increased the signal count rate by nearly three orders of magnitude compared to existing setups, (2) a protocol to extract information about atomic motion due to molecular internal motion from AMS experimental data, (3) an AMS apparatus using an ultrashort pulsed electron gun whose temporal width is short enough to conduct time-resolved spectroscopy. These achievements form the basis for realizing time-resolved version of AMS.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

本研究の意義は、分子内原子運動を調べるためにこれまでもっぱら研究されてきた分子系のエネルギー的側面ではなく、原子運動量の変化に最大限に焦点をあて、従来とは異なる新しい視点から化学反応の基礎的理解を得ようとすることにある。本研究により、化学反応中に各原子に働く力を可視化するために不可欠な、技術的・原理的基礎を確立し、今後、本手法を反応中の分子系に応用することにより化学反応の起源に迫ることができると期待される。