衝突誘導の蒸気雲内における炭素化学に対する熱分解SiO2の影響

Chemical reactions within impact-induced vapor clouds may have played an important role in both the evolution of atmosphere of the Earth and the origin of life. However, chemical reaction process within impact vapor clouds is not understood well yet. In particular, chemical interaction between silicates and carbon compounds has not been studied extensively. The thermal decomposition of silicates within impact vapor clouds may affect the carbon chemistry within impact vapor clouds. Laser irradiation experiments using terrestrial rocks and chondrites by Mukhin et al. (1989) show that the carbon-bearing gas produced in the laser heating experiments were composed mainly of the oxidized species, such as CO and CO2, with only small amounts of reduced species such as hydrocarbon, HCN, and CH3CHO. Mukhin et al. (1989) propose that oxygen derived from thermal decomposition of silicates may oxidize carbon. However, such an oxidation process has not been investigated in detail. Most theoretical studies on chemical reaction in impact vapor clouds neglected such an effect of oxygen released from silicates. In this study investigated quantitatively is the oxidation of carbon compounds by oxygen from SiO2 in vapor clouds using laser-pulse heating experiments.
資料番号: AA0047898009