Spectroscopic properties of polycyclic aromatic hydrocarbons (PAHs) and astrophysical implications

PAHs (polycyclic aromatic hydrocarbons) are probably present as a mixture of neutral and ionized species and are responsible for the set of infrared emission bands in the 2–15 μm regions, which are observed in many different objects like reflection and planetary nebulae and external galaxies. PAHs a...

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Bibliographic Details
Published in:Advances in space research 1997, Vol.19 (7), p.1023-1032
Main Authors: d'Hendecourt, L, Ehrenfreund, P
Format: Article
Language:English
Subjects:
Extraterrestrial Environment
Gases - analysis
Meteoroids
Polycyclic Aromatic Hydrocarbons - analysis
Solar System
Space life sciences
Spectrophotometry, Infrared
Spectrum Analysis
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Summary:PAHs (polycyclic aromatic hydrocarbons) are probably present as a mixture of neutral and ionized species and are responsible for the set of infrared emission bands in the 2–15 μm regions, which are observed in many different objects like reflection and planetary nebulae and external galaxies. PAHs are suggested to be the most abundant free organic molecules and ubiquitous in space. PAHs might also exist in the solid phase, included in interstellar ices in dense clouds. A complex aromatic network is expected on interstellar grains in the diffuse interstellar medium. The existence of an aromatic kerogen-like structure in carbonaceous meteorites and its similarity with interstellar spectra suggests a link between interstellar matter and primitive Solar System bodies.
ISSN:0273-1177
1879-1948
DOI:10.1016/S0273-1177(97)00349-9