Allamandola L J, Sandford S A, Wopenka B
Science. 1987 Jul 3;237(4810):56-9. doi: 10.1126/science.237.4810.56.
Both interplanetary dust particles (IDP(s)) and meteorites may contain material that is similar to polycyclic aromatic hydrocarbons(PAH(s)). The Raman spectra of IDP(s) 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 PAH(s). The Raman spectra of some IDP(s) also show red photoluminescence that is similar to the excess red emission seen in some astronomical objects and that has also been attributed to PAH(s) and hydrogenated amorphous carbon. Moreover, a part of the carbonaceous phase in IDP(s) and meteorites contains deuterium to hydrogen ratios that are greater than those for terrestrial samples. Deuterium enrichment is expected in small free PAH(s) that are exposed to ultraviolet radiation in the interstellar medium. Taken together, these observations suggest that some of the carbonaceous material in IDP(s) and meteorites may have been produced in circumstellar dust shells and only slightly modified in interstellar space.
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。IDP和陨石的拉曼光谱显示出的特征，在位置和相对强度上与星际红外发射特征相似，这些特征被归因于游离的、分子大小的PAH中的振动跃迁。一些IDP的拉曼光谱还显示出红色光致发光，这与在一些天体中看到的过量红色发射相似，并且也被归因于PAH和氢化非晶碳。此外，IDP和陨石中的一部分碳质相所含的氘氢比高于地球样品。在星际介质中暴露于紫外线辐射的小游离PAH中预计会有氘富集。综合来看，这些观察结果表明，IDP和陨石中的一些碳质物质可能是在恒星周围尘埃壳中产生的，并且在星际空间中只发生了轻微的改变。
