Experimental study on correlation between isomer abundance rate and temperature in molecular clouds

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K13982
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 17010:Space and planetary sciences-related
• Research Institution: Rikkyo University
• Principal Investigator: Shiina Yoko 立教大学, 理学部, 助教 (70845221)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: 宇宙科学 / 移動度分析

Outline of Final Research Achievements

A cryogenic ion mobility analyzer (77-300 K) was developed for investigating reactions involving isomers in molecular clouds. An electron impact ion source and electrospray ion source were installed to the ion mobility analyzer, which generate various ions like formate ions or amino acid ions. Also the analyzer's alignment was carefully arranged to maximize ion transmission rate so that the time efficiency of measurements were greatly improved. As a result, ion species with lower intensities became measurable.

Free Research Field

原子分子衝突

Academic Significance and Societal Importance of the Research Achievements

本研究では分子雲の環境(温度・ガス密度・ガス組成・放射線強度など)を観測から知るための手がかりとすべく，分子雲中において異性体が関わる化学反応の 断面積や分岐比を詳細に調べるため，液体窒素温度に冷却した高分解能移動度分析装置の開発を行った.移動度分析では，電場・磁場による分析で不可能な質量電荷比が等しい異性体イオンの分析が可能だが，2~20原子数ほどの小さな分子を測定する研究は比較的少なく，本研究で構築した装置で今後得られる成果には大きな意義があると考えられる.