The formation of carbon dioxide in molecular cores by a non-energetic route

J. A. Noble, F. Dulieu, E. Congiu, H. J. Fraser

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The formation of CO2 in quiescent molecular cores has long been of interest to astrochemists as CO2 is one of the most abundant solid phase molecules present in the interstellar medium. Previous studies have concentrated, for the most part, on formation mechanisms involving high energy particle or UV bombardment of ices, to mimic the influence of cosmic rays on solid phase species in the outer, lower density regions of molecular clouds. However, condensed phase CO2 is also observed in the inner, denser regions of clouds, where less UV radiation penetrates. To date, very few studies have been made of CO2 formation in the absence of energetic particles. Low-energy routes to the formation of CO2 are crucial to explain the high abundances of this molecule observed in quiescent regions. We discuss recent experimental results of a study of the low-energy reaction CO + OH. A simple model, developed to describe the kinetics of the system, suggests that the various reactions of the OH radical are key in characterising the production of CO2 and other species. Our results indicate that some CO2 forms concurrently with H2O in molecular clouds, in line with both previous observations and theory. The results of this research are published in Noble et al. (2011).

Original languageEnglish
Title of host publicationECLA - European Conference on Laboratory Astrophysics
Number of pages4
StatePublished - 2012
Externally publishedYes
Event1st European Conference on Laboratory Astrophysics, ECLA - Paris, France
Duration: Sep 26 2011Sep 30 2011

Publication series

NameEAS Publications Series
ISSN (Print)1633-4760
ISSN (Electronic)1638-1963


Conference1st European Conference on Laboratory Astrophysics, ECLA


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