| Budget Amount *help |
¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Outline of Final Research Achievements |
In the present study, in order to better understand molecular evolution in space, variations in the hydrogen isotopic composition of hexamethylenetetramine (HMT) through molecular clouds (MCs) to the solar system were experimentally investigated. Critical parameters to constrain the hydrogen isotopic composition of the HMT formed in MCs were that of methanol used for HMT formation and the temperature where photochemical reactions took place. After the formation by photochemical reactions, the deuterium enrichment of HMT was diluted via hydrogen isotopic exchanges with water, resulting in the formation of less deuterium-enriched HMT. These results suggest that moderately deuterium-enriched signature observed in meteoritic organic compounds can be reproduced from highly deuterium-enriched interstellar molecules.
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