INTERSTELLAR POLYCYCLIC AROMATIC-HYDROCARBONS AND CARBON IN INTERPLANETARY DUST PARTICLES AND METEORITES
INTERSTELLAR POLYCYCLIC AROMATIC-HYDROCARBONS AND CARBON IN INTERPLANETARY DUST PARTICLES AND METEORITES
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DOI：
10.1126/science.237.4810.56
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发表时间：
1987-07-03
期刊：
影响因子：
56.9
通讯作者：
WOPENKA, B
中科院分区：
文献类型：
--
作者：
ALLAMANDOLA, LJ;SANDFORD, SA;WOPENKA, B
行星际尘埃颗粒（IDP）和陨石都可能含有类似于多环芳烃（PAH）的物质。的拉曼光谱的IDP和陨石显示的功能，是类似的位置和相对强度的星际红外发射功能，已被归因于振动跃迁的自由，分子大小的多环芳烃。一些IDP的拉曼光谱也显示出红色光致发光，这与在一些天文物体中看到的过量红色发射相似，也归因于多环芳烃和氢化无定形碳。此外，部分的碳相在国内流离失所者和陨石含有氘氢比大于陆地样品。在星际介质中暴露于紫外线辐射的小的游离多环芳烃中预计会富集氘。总之，这些观察结果表明，在IDP和陨石中的一些碳质物质可能是在拱星尘埃壳中产生的，在星际空间中只发生了轻微的变化。
Both interplanetary dust particles (IDPs) and meteorites may contain material that is similar to polycyclic aromatic hydrocarbons (PAHs). The Raman spectra of IDPs and meteorites show features that are similar in position and relative strength to interstellar infrared emission features that have been attributed to vibrational transitions in free, molecular-sized PAHs. The Raman spectra of some IDPs also show red photoluminescence that is similar to the excess red emission seen in some astronomical objects and that has also been attributed to PAHs and hydrogenated amorphous carbon. Moreover, a part of the carbonaceous phase in IDPs and meteorites contains deuterium to hydrogen ratios that are greater than those for terrestrial samples. Deuterium enrichment is expected in small free PAHs that are exposed to ultraviolet radiation in the interstellar medium. Taken together, these observations suggest that some of the carbonaceous material in IDPs and meteorites may have been produced in circumstellar dust shells and only slightly modified in interstellar space.