Interstellar Polycyclic Aromatic Compounds and Astrophysics
نویسندگان
چکیده
منابع مشابه
Closed-shell polycyclic aromatic hydrocarbon cations: a new category of interstellar polycyclic aromatic hydrocarbons.
Density functional theory has been employed to calculate the harmonic frequencies and intensities of a range of polycyclic aromatic hydrocarbon (PAH) cations that explore both size and electronic structure effects on the infrared spectroscopic properties of these species. The sample extends the size range of PAH species considered to more than 50 carbon atoms and includes several representative...
متن کاملPolycyclic aromatic hydrocarbons and the diffuse interstellar bands: a survey.
We discuss the proposal relating the origin of some of the diffuse interstellar bands (DIBs) to neutral and ionized polycyclic aromatic hydrocarbons (PAHs) present in interstellar clouds. Laboratory spectra of several PAHs, isolated at low temperature in inert gas matrices, are compared with the spectra of five reddened early-type stars selected from an extensive set of astronomical spectra. Fr...
متن کاملOverview of Polycyclic Aromatic Compounds (PAC)
The chemical group of polycyclic aromatic compounds (PAC), including the better-known subgroup of polycyclic aromatic hydrocarbons (PAH) and the heterocyclic aromatic compounds (NSO-PAC, heterocycles), comprise several thousand individual compounds. It is hard to find a comprehensive overview in the literature of these PACs that includes a substantial amount of relevant properties. Here an atte...
متن کاملDehydrogenation of polycyclic aromatic hydrocarbons in the diffuse interstellar medium
We present a model for the hydrogenation states of Polycyclic Aromatic Hydrocarbons (PAHs) in the diffuse interstellar medium. First, we study the abundance of hydrogenation and charge states of PAHs due to photo-ionization, photodissociation in the interstellar UV field, electron recombination and chemical reactions between PAH cations and H or H2. For PAH cations, we find that the dehydrogena...
متن کاملMonitoring human occupational and environmental exposures to polycyclic aromatic compounds.
Many research groups have been carrying out studies to develop biomarkers of exposure to polycyclic aromatic compounds (PACs) and apply these for human biomonitoring. The main objectives of the use of biomarkers are to determine specific occupational and environmental exposures to monitor the effectiveness of exposure controls and prediction of the risk of disease. This article presents a revie...
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ژورنال
عنوان ژورنال: Polycyclic Aromatic Compounds
سال: 2002
ISSN: 1040-6638,1563-5333
DOI: 10.1080/10406630213586