Japan Geoscience Union Meeting 2014

Presentation information

Poster

Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS24_1PO1] Origin and evolution of materials in space

Thu. May 1, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Tachibana Shogo(Department of Natural History Scieces, Hokkaido University), Hitoshi Miura(Graduate School of Natural Sciences, Department of Information and Biological Sciences, Nagoya City University), Takafumi Ootsubo Takafumi(Astronomical Institute, Tohoku Unuversity), Mitsuhiko Honda(Department of Mathematics and Physics, Kanagawa University)

6:15 PM - 7:30 PM

[PPS24-P01] Importance of deuterium fractionation of ethanol by grain surface reactions: experiment of H-D tunneling substitution

*Kazuya OSAKA1, Yasuhiro OBA1, Akira KOUCHI1, Naoki WATANABE1 (1.Inst Low Temp Sci, Hokkaido University)

Keywords:deuterium enrichment, ethanol, grain surface reaction

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.