Molecular hydrogen formation in the interstellar medium: the role of polycyclic aromatic hydrocarbons analysed by the reaction force and activation strain model

2018 ◽  
Vol 481 (3) ◽  
pp. 3052-3062 ◽  
Author(s):  
César Barrales-Martínez ◽  
Diego Cortés-Arriagada ◽  
Soledad Gutiérrez-Oliva
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Interstellar Medium ◽  
Aromatic Hydrocarbons ◽  
Molecular Hydrogen ◽  
Reaction Force ◽  
Hydrogen Formation ◽  
Polycyclic Aromatic ◽  
Strain Model

Polycyclic aromatic hydrocarbons – catalysts for molecular hydrogen formation

2014 ◽  
Vol 168 ◽  
pp. 223-234 ◽  
Author(s):  
A. L. Skov ◽  
J. D. Thrower ◽  
L. Hornekær
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Cross Section ◽  
Cross Sections ◽  
Aromatic Hydrocarbons ◽  
Molecular Hydrogen ◽  
Mass Spectrometry Data ◽  
Quadrupole Mass ◽  
Hydrogen Formation ◽  
Polycyclic Aromatic ◽  
Peak Mass

Polycyclic aromatic hydrocarbons (PAHs) have been shown to catalyse molecular hydrogen formation. The process occurs via atomic hydrogen addition reactions leading to the formation of super-hydrogenated PAH species, followed by molecular hydrogen forming abstraction reactions. Here, we combine quadrupole mass spectrometry data with kinetic simulations to follow the addition of deuterium atoms to the PAH molecule coronene. When exposed to sufficiently large D atom fluences, coronene is observed to be driven towards the completely deuterated state (C24D36) with the mass distribution peaking at 358 amu, just below the peak mass of 360 amu. Kinetic models reproduce the experimental observations for an abstraction cross-section of σabs = 0.01 Å2 per excess H/D atom, and addition cross-sections in the range of σadd = 0.55–2.0 Å2 for all degrees of hydrogenation. These findings indicate that the cross-section for addition does not scale with the number of sites available for addition on the molecule, but rather has a fairly constant value over a large interval of super-hydrogenation levels.

Role of alterations in ca2+‐associated signaling pathways in the immunotoxicity of polycyclic aromatic hydrocarbons

1995 ◽  
Vol 45 (2) ◽  
pp. 101-126 ◽  
Author(s):  
Donna R. Davila ◽  
DeAnn P. Davis ◽  
Kerry Campbell ◽  
John C. Cambier ◽  
Letitia A. Zigmond ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Signaling Pathways ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic
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