NDLI: Aromatic components in cometary materials

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Aromatic components in cometary materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wopenka, B. Sandford, Scott A. Allamandola, Louis J.
Copyright Year	1988
Description	The Raman spectra of interplanetary dust particles (IDPs) collected in the stratosphere show that two bands at about 1350 and 1600 delta/cm and a broader feature between 2200 and 3300 delta/cm that are characteristic of aromatic molecular units with ordered domains smaller than 25 A in diameter. This suggests that the carbonaceous material in IDPs may be similar to the polymeric component seen in meteorites, where this material is thought to consist of aromatic molecular units that are randomly interlinked by short aliphatic bridges. The features in the Raman spectra of IDPs are similar in position, and relative strength to interstellar infrared emission features that have been attributed to vibrational transitions in free molecular polycyclic aromatic hydrocarbons. Taken together, these observations suggest that some fraction of the carbonaceous materials in IDPs may have been produced in circumstellar dust shells and only slightly modified in interstellar space.
File Size	97372
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890003966
Archival Resource Key	ark:/13960/t7tn24112
Language	English
Publisher Date	1988-09-01
Access Restriction	Open
Subject Keyword	Astronomy Raman Spectra Cometary Atmospheres Carbonaceous Materials Molecular Structure Polycyclic Aromatic Hydrocarbons Emission Spectra Photoluminescence Hydrocarbons Chemical Composition Halley's Comet Interplanetary Dust Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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