Theoretical calculations of the thermal rate constants for the gas-phase chemical reactions hydrogen atom + ammonia .dblarw. hydrogen + amidogen and deuterium atom + ammonia-d3 .dblarw. deuterium + amidogen-d2

1990 ◽  
Vol 94 (18) ◽  
pp. 7096-7106 ◽  
Author(s):  
Bruce C. Garrett ◽  
Michael L. Koszykowski ◽  
Carl F. Melius ◽  
Michael. Page
Keyword(s):  
Hydrogen Atom ◽  
Gas Phase ◽  
Chemical Reactions ◽  
Rate Constants ◽  
Theoretical Calculations ◽  
Deuterium Atom ◽  
Thermal Rate Constants ◽  
Phase Chemical

scholarly journals Galactic Bulge PNe: Carbon molecules in oxygen-rich environments

2011 ◽  
Vol 7 (S283) ◽  
pp. 259-262
Author(s):  
Lizette Guzmán-Ramírez ◽  
Albert Zijlstra ◽  
Roisin Níchuimín ◽  
Krzysztof Gesicki ◽  
Eric Lagadec ◽  
...  
Keyword(s):  
Gas Phase ◽  
Chemical Reactions ◽  
Planetary Nebulae ◽  
Galactic Bulge ◽  
Hydrocarbon Chains ◽  
Show Evidence ◽  
Low Mass ◽  
Carbon Molecules ◽  
Hydrocarbon Chemistry ◽  
Phase Chemical

AbstractGalactic bulge planetary nebulae show evidence of mixed chemistry with emission from both silicate dust and PAHs. This mixed chemistry is unlikely to be related to carbon dredge up, as third dredge-up is not expected to occur in the low mass bulge stars. We show that the phenomenon is widespread, and is seen in 30 nebulae out of our sample of 40. A strong correlation is found between strength of the PAH bands and morphology, in particular, the presence of a dense torus. A chemical model is presented which shows that hydrocarbon chains can form within oxygen-rich gas through gas-phase chemical reactions. We conclude that the mixed chemistry phenomenon occurring in the galactic bulge planetary nebulae is best explained through hydrocarbon chemistry in an UV-irradiated, dense torus.

Spin-orbit effects in gas-phase chemical reactions

1987 ◽  
Vol 87 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Paul J. Dagdigian ◽  
Mark L. Campbell
Keyword(s):  
Gas Phase ◽  
Chemical Reactions ◽  
Spin Orbit ◽  
Phase Chemical
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