| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Aromatic hydrocarbon is one of the main component of interstellar dust. The hydrogenation and deuteration of interstellar aromatic hydrocarbons is of particular interest for the formation of aliphatic hydrocarbons and their deuterated isotopologues.
In the present study, the hydrogenation/deuteration reactions of amorphous solid benzene (C6H6) was investigated at low temperatures of 10-50 K. Cyclohexane or deuterated cyclohexane are efficiently formed by H or D atom addition via quantum tunneling. In addition, we found that the isotopically insensitive surface processes (adsorption and diffusion) of the atoms physisorbed on solid C6H6 masked the tunneling kinetic isotope effect.
The present results implicate that interstellar aromatic hydrocarbons can be hydrogenated or deuterated by the tunneling of H or D atoms at low temperatures, and that the tunneling kinetic isotope effect would not strongly inhibit the deuteration of interstellar aromatic hydrocarbons.
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