TOF‐SIMS analysis of cometary matter in Stardust aerogel tracks

TOF‐SIMS analysis of cometary matter in Stardust aerogel tracks
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星尘气凝胶轨迹中彗星物质的 TOF-SIMS 分析

DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Zolensky
M. Zolensky
中科院分区：
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文献类型：
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作者：
T. Stephan;D. Rost;E. Vicenzi;E. Bullock;G. MacPherson;A. Westphal;C. Snead;G. Flynn;S. Sandford;M. Zolensky

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摘要-用飞行时间质谱仪研究了星尘任务气凝胶样品中的彗星物质的元素组成和有机组成。虽然单颗粒μm的化学成分变化很大，但在一个磁道的壁上发现的纳米级材料的Na、Mg、Al、Ti、Cr、Mn和Co的块状CI球粒元素与Fe的比例在1.22倍以内。与CI相比，Ca的贫化程度是CI的四倍，Ni的富集度是CI的两倍。这些结果似乎证实了最近关于Wild 2的类似CI的整体成分的报道。由于捕获介质中存在污染物，气凝胶样品中有机化合物的分析变得复杂。然而，观察到了可能归因于该彗星的多环芳烃。
Abstract— Cometary matter in aerogel samples from the Stardust mission was investigated with TOF‐SIMS for its elemental and organic composition. While single grains >1 μm are highly variable in their chemical composition, nanometer‐scale material found in the wall of one track has within a factor of 1.22 bulk CI chondritic element ratios relative to Fe for Na, Mg, A1, Ti, Cr, Mn, and Co. Compared to CI, a depletion in Ca by a factor of four and an enrichment in Ni by a factor of two was observed. These results seem to confirm recent reports of a CI‐like bulk composition of Wild 2. The analysis of organic compounds in aerogel samples is complicated by the presence of contaminants in the capture medium. However, polycyclic aromatic hydrocarbons that could possibly be attributed to the comet were observed.