在类欧罗巴条件下辐照NaCl的中紫外光谱
The mid-UV spectrum of irradiated NaCl at Europa-like conditions
摘要：
哈勃太空望远镜最近的观测显示，在木卫二上的半球混沌区域存在中紫外线吸收特征。先前发现相同区域在450 nm处具有可见吸收，这归因于辐照NaCl的存在。在这些地形的可见光谱中缺乏对NaCl的任何额外诊断排除，使得难以确认这种识别。在这里，我们使用实验室实验表明，NaCl在木卫二的地面温度照射开发的吸收在$\sim$ 220 nm符合新的检测木卫二的中紫外光谱，强烈支持NaCl的识别。在主导半球混沌地形中的辐照氯化钠表明，钠和氯是木卫二地下海洋的重要组成部分。
英文摘要：
Recent observations from the Hubble Space Telescope show a mid-UV absorption feature localized to leading hemisphere chaos regions on Europa. The same regions were previously found to have a visible absorption at 450 nm that was attributed to the presence of irradiated NaCl. The lack of any additional diagnostic absorptions for NaCl in the visible spectrum of these terrains made confirmation of this identification difficult. Here we use laboratory experiments to show that NaCl irradiated at Europa's surface temperatures develops an absorption at $\sim$220 nm consistent with the new detection in Europa's mid-UV spectrum, strongly supporting the NaCl identification. Irradiated NaCl in leading-hemisphere chaos terrain would suggest that sodium and chlorine are important components of Europa's subsurface ocean.
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