论文标题
在类似欧罗巴的条件下辐照的NaCl的中UV频谱
The mid-UV spectrum of irradiated NaCl at Europa-like conditions
论文作者
论文摘要
哈勃太空望远镜的最新观察结果表明，中肠吸收的特征局部位于欧罗巴上领先的半球混乱区域。先前发现相同的区域在450 nm处具有可见的吸收，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的任何其他诊断吸收，因此难以确认这种识别。在这里，我们使用实验室实验表明，在欧罗巴的表面温度下辐照的NaCl在$ \ sim $ 220 nm处的吸收与欧罗巴Mid-UV光谱中的新检测一致，从而强烈支持NaCl识别。领先的山脉混乱地形中的辐照NaCl会表明钠和氯是欧罗巴地下海洋的重要组成部分。
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.
