Mechanisms of formation and isotope fractionation of interstellar molecules on cosmic dust

2016 Fiscal Year Final Research Report

• Project/Area Number: 24224012
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Hokkaido University
• Principal Investigator: WATANABE NAOKI 北海道大学, 低温科学研究所, 教授 (50271531)
• Co-Investigator(Kenkyū-buntansha): 日高 宏 北海道大学, 低温科学研究所, 助教 (00400010) ; 大場 康弘 北海道大学, 低温科学研究所, 助教 (00507535) ; 羽馬 哲也 北海道大学, 低温科学研究所, 助教 (20579172)
• Co-Investigator(Renkei-kenkyūsha): KOUCHI Akira 北海道大学, 低温科学研究所, 教授 (60161866)
• Project Period (FY): 2012-05-31 – 2017-03-31
• Keywords: 地球外物質化学 / 星間塵表面反応 / 重水素濃集

Outline of Final Research Achievements

Formation and isotope fractionation of molecules in molecular clouds are very important as the initial stage of chemical evolution toward planetary system. The aim of this project was to clarify the role of physicochemical processes on cosmic ice dust at very low temperatures which are keys in chemical evolution. We have experimentally demonstrated mechanisms of elementary processes for molecular formation and deuteration on ice at around 10 K. We determined diffusion-rates of hydrogen (deuterium) atoms on amorphous ice and formation (and deuteration) pathways and those reaction rates for water and some primordial organic molecules.

Free Research Field

星間化学物理, 原子分子物理