Digital data acquisition system for complex nuclear reaction experiments

分类： 物理学 >> 核物理学 提交时间： 2023-12-20

Weiliang Pu Yanlin Ye Jianling Lou Jiahao Chen

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Three-step Formation of Diamonds in Shock-compressed Hydrocarbons: Decomposition, Species Separation, and Nucleation

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Bo Chen Qiyu Zeng Xiaoxiang Yu Jiahao Chen Shen Zhang Dongdong Kang Jiayu Dai

摘要： The accumulation and circulation of carbon-hydrogen dictate the chemical evolution of ice giant planets. Species separation and diamond precipitation have been reported in carbon-hydrogen systems, verified by static and shock-compression experiments. Nevertheless, the dynamic formation processes for the above-mentioned phenomena are still insufficiently understood. Here, combing deep learning model, we demonstrate that diamonds form through a three-step process involving decomposition, species separation and nucleation procedures. Under shock condition of 125 GPa and 4590 K, hydrocarbons are decomposed to give hydrogen and low-molecular-weight alkanes (CH4 and C2H6), which escape from the carbon chains resulting in C/H species separation. The remaining carbon atoms without C-H bonds accumulate and nucleate to form diamond crystals. The process of diamond growth is found to associated with a critical nucleus size where dynamic energy barrier plays a key role. These dynamic processes for diamonds formation are insightful in establishing the model for ice giant planet evolution.

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