極低温星間塵表面原子反応による水分子生成

概要

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Formation of water by reaction of oxygen molecules (O_2) with hydrogen atoms (H) were investigated at low temperatures (10-40 K) in order to reveal the possible reaction pathways to yield water on grain surfaces in molecular clouds. Two types of experiments for surface reaction between O_2 and H were performed: one of which was that solid O_2 was deposited onto the surface, followed by H irradiations to the O_2, another of which was that gaseous O_2 was continuously codeposited with H onto the surface and was reacted with each other. H_2O (D_2O) and H_2O_2 (D_2O_2) were quickly produced through successive reactions of O_2 with H (D). Reaction kinetics and isotope effect are discussed for the former experiment. For the latter experiment, the dependence of compositions of the products on the temperature and O_2/H ratio, and also the structure of the H_2O ice produced are examined.
日本地球化学会の論文