scholarly journals Spectroscopy of polycyclic aromatic hydrocarbons and very small grains in photodissociation regions

2004 ◽  
Vol 429 (1) ◽  
pp. 193-204 ◽  
Author(s):  
M. Rapacioli ◽  
C. Joblin ◽  
P. Boissel
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic ◽  
Small Grains ◽  
Photodissociation Regions

scholarly journals Identification of Polycyclic Aromatic Hydrocarbons

1987 ◽  
Vol 120 ◽  
pp. 557-558
Author(s):  
A. Léger ◽  
L. D'Hendecourt
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Organic Molecules ◽  
Polycyclic Aromatic ◽  
Small Grains ◽  
Ir Emission ◽  
Graphitic Material

The nature of the Very Small Grains evidenced by K. Sellgren (1985) is discussed. Their stability suggests that they are graphitic material and specifically Polycyclic Aromatic Hydrocarbons (PAHs). The expected IR emission of a typical PAH, coronene, gives an impressive spectroscopic agreement with the five observed “Unidentified IR Emission Features”, leading to an unambiguous identification. Those PAHs are the most abundant organic molecules detected to this date (f ~ 10−5).

scholarly journals The Environments of the Massive Star Clusters in the Carina Nebula

2002 ◽  
Vol 207 ◽  
pp. 129-131
Author(s):  
Kate Brooks ◽  
Jill Rathborne ◽  
Michael Burton
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Massive Star ◽  
Star Clusters ◽  
Extensive Field ◽  
Carina Nebula ◽  
Polycyclic Aromatic ◽  
Photodissociation Regions

We have imaged over an extensive field the 3.29-μm emission from the Carina Nebula. This emission arises from polycyclic aromatic hydrocarbons which are excellent tracers of photodissociation regions. The results emphasis the two very different environments of the massive star clusters of the nebula, Trumpler 14 and 16.

The Assessment of Contamination and Source of Polycyclic Aromatic Hydrocarbons from the Sediments of the Someş River

2019 ◽  
Vol 64 (1) ◽  
pp. 55-67
Author(s):  
Vlad Pӑnescu ◽  
◽  
Mihaela Cӑtӑlina Herghelegiu ◽  
Sorin Pop ◽  
Mircea Anton ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

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