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  • 1
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    Modeling the unidentified infrared emission with combinations of polycyclic aromatic hydrocarbons (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The infrared emission band spectrum associated with many different interstellar objects can be modeled successfully by using combined laboratory spectra of neutral and positively charged polycyclic aromatic hydrocarbons (PAHs). These model spectra, shown here for the first time, alleviate the principal spectroscopic criticisms previously leveled at the PAH hypothesis and demonstrate that mixtures of free molecular PAHs can indeed account for the overall appearance of the widespread interstellar infrared emission spectrum. Furthermore, these models give us insight into the structures, stabilities, abundances, and ionization balance of the interstellar PAH population. These, in turn, reflect conditions in the emission zones and shed light on the microscopic processes involved in the carbon nucleation, growth, and evolution in circumstellar shells and the interstellar medium.
    Keywords: Life Sciences (General)
    Type: The Astrophysical journal (ISSN 0004-637X); Volume 511; 2 Pt 2; L115-9
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The AstroBiology Explorer (ABE) Mission (2003)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Introduction: Infrared spectroscopy in the 2.5- 16 micron range is a principle means by which organic compounds can be detected and identified in space via their vibrational transitions. Ground-based, airborne, and spaceborne IR spectral studies have already demonstrated that a significant fraction of the carbon in the interstellar medium (ISM) resides in the form of complex organic molecular species. Furthermore, the presence of D-enriched organics in meteorites suggests that a portion of these materials survives incorporation into protosolar nebulae. Unfortunately, neither the distribution of these materials in space nor their genetic and evolutionary relationships with each other or their environments are currently well understood. The Astrobiology Explorer (ABE) is a MIDEX mission concept designed to use infrared spectroscopy to address outstanding problems in Astrochemistry which are particularly relevant to Astrobiology and are amenable to astronomical observation. ABE is currently under study at NASA's Ames Research Center in collaboration with Ball Aerospace and Technologies Corporation and the Jet Propulsion Laboratory. ABE was selected for Phase A study during the last MIDEX AO round, but has yet to be selected for flight.
    Keywords: Life Sciences (General)
    Type: Workshop on Cometary Dust in Astrophysics; 62; LPI-Contrib-1182
    Format: text
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