月球表面钙长石太阳风辐射损伤的后期热效应实验研究

Solar wind irradiation damage characteristics of lunar minerals are the key for the studying of solar wind irradiation history as well as the inversion of the evolution history of lunar surface materials. The post-thermal effects which mainly consist of solar radiation and meteorite bombardment can significantly alter the existing lunar mineral characteristics of the solar wind radiation damage, resulting in a significant impact on the research work. The research works of this funding are based on the irradiation damage of anorthite. The solar wind Irradiation will be simulated by ions implanter, and the post-thermal effects will be simulated by vacuum furnace, pulsed laser ablation system and environmental TEM. The fine structure information of anorthite irradiation and the occurrence of solar wind components before and after heating will be obtained by spherical aberration correction TEM. The real-time information about the characteristics of anorthite’s solar wind irradiation damage and occurrence of solar wind components during the heating will be obtained by in situ transmission electron microscopy. Finally, summarize of the post-thermal effects of occurrence position of solar wind gas in anorthite, the formation, growth, migration and healing process of bubbles, the reset process of the amorphous lattice defects as well as the process of recrystallization, investigate the mechanism of post-thermal effects of radiation damage of anorthite. This research has important implications for the correctly understanding of radiation damage characteristics of lunar samples as well as accurately inverse the solar wind irradiation history.

月表矿物的太阳风辐射损伤特征是研究月表太阳风作用历史以及反演月表物质演化过程的主要依据之一。而以太阳光照射和陨石轰击为主的后期热作用能够显著改变月表矿物原有的太阳风辐射损伤特征，从而对相关研究工作造成重要影响。本项目以钙长石的太阳风辐射损伤结构为研究对象，依托模拟实验开展太阳光照射及陨石轰击等热作用对辐射损伤结构后期改造的研究工作。获取加热前后钙长石的辐射损伤特征、太阳风组分赋存位置等精细结构信息以及加热过程中钙长石的太阳风辐射损伤结构随温度的实时变化信息。深入分析热作用对太阳风气体赋存位置、迁移运动过程，气泡的形成、生长、愈合过程，晶格缺陷复位以及非晶质结构重结晶过程的具体影响，探讨钙长石太阳风辐射损伤特征的后期热效应机制。研究成果对于正确认识月球样品的辐射损伤特征，准确反演月表物质的太阳风作用历史具有重要意义。

第一次系统开展了高牌号（An98-99）钙长石的粒子注入辐射损伤特征及后期热效应的研究工作，最大程度还原了月球表面太阳风对月表高地斜长岩地区的辐射损伤特征。依托环境透射电镜开展了钙长石辐射损伤特征的原位加热研究，首次获取了辐射损伤的钙长石在原位加热作用下的热效应研究。上述研究成果对于恢复月球斜长岩高地地区的太空风化作用过程以及太阳风气体的赋存状态具有重要意义。