| Budget Amount *help |
¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2014: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
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| Outline of Final Research Achievements |
In the present study, laboratory experiments on the chemical evolution of the representative sulfur-bearing interstellar molecules, hydrogen sulfide (H2S), were performed under the interstellar conditions (low T, P). H2S was found to react with H and D atoms on the substrate at low temperatures. When it reacts with H atoms, the H of H2S is abstracted to form HS radicals, which are expected to react with other H atoms to result in the formation of H2S again. However, the H2S abundance was getting smaller with H atom exposure times. This is probably due to the chemical desorption of H2S by using the heat of formation of H2S.
When H2S reacted with D atoms under the similar conditions, the formation of its deuterated counterparts (HDS and D2S) was confirmed. It is strongly expected that the high degree of H2S deuteration levels in interstellar and cometary H2S is induced by surface reactions on interstellar grains.
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