日本地球惑星科学連合2014年大会

講演情報

口頭発表

セッション記号 P (宇宙惑星科学) » P-PS 惑星科学

[P-PS24_1PM2] 宇宙における物質の形成と進化

2014年5月1日(木) 16:15 〜 18:00 415 (4F)

コンビーナ:*橘 省吾(北海道大学大学院理学研究院自然史科学専攻地球惑星システム科学分野)、三浦 均(名古屋市立大学大学院システム自然科学研究科)、大坪 貴文(東北大学大学院理学研究科天文学専攻)、本田 充彦(神奈川大学理学部数理物理学科)、座長:橘 省吾(北海道大学大学院理学研究院自然史科学専攻地球惑星システム科学分野)

17:45 〜 18:00

[PPS24-P01_PG] 星間塵表面におけるエタノール重水素濃集の可能性:H-Dトンネル置換反応実験

ポスター講演3分口頭発表枠

*尾坂 和哉1大場 康弘1香内 晃1渡部 直樹1 (1.北大 低温研)

キーワード:重水素濃集, エタノール, 星間塵表面反応

Since we have demonstrated the importance of tunneling grain surface reactions in deuterium fractionation of molecules, many works have targeted this process. To date, we have shown that the grain surface reactions play a crucial role in deuterium enrichments of water, formaldehyde, methanol, and methylamine. In this talk, we present the results of experiment on H-D substitution tunneling reactions of ethanol on cryogenic surfaces. Although C2H5OH was observed toward interstellar clouds, its deuterated species have not been detected. However, it was found that its homologous, CH3OH can be highly deuterated by H-D substitution reactions on grain surfaces and thus it should be reasonable to focus on the potential importance of this process for ethanol. We demonstrated that deuterated methanol is efficiently produced by tunneling reaction of H atoms at very low temperatures relevant to grain surfaces in clouds. H-D reactions predominantly occur in CH3-CH2- groups but were hardly observed in an ?OH group which is consistent with the methanol case.