SIMBAD references

2017MNRAS.470.4075L - Mon. Not. R. Astron. Soc., 470, 4075-4088 (2017/October-1)

The interstellar chemistry of C3H and C3H2 isomers.

LOISON J.-C., AGUNDEZ M., WAKELAM V., ROUEFF E., GRATIER P., MARCELINO N., REYES D.N., CERNICHARO J. and GERIN M.

Abstract (from CDS):

We report the detection of linear and cyclic isomers of C3H and C3H2 towards various starless cores and review the corresponding chemical pathways involving neutral (C3Hx with x = 1,2) and ionic (C3Hx+ with x = 1,2,3) isomers. We highlight the role of the branching ratio of electronic dissociative recombination (DR) reactions of C3H2+ and C3H3+ isomers, showing that the statistical treatment of the relaxation of C3H* and C3H2* produced in these DR reactions may explain the relative c,l-C3H and c,l-C3H2 abundances. We have also introduced in the model the third isomer of C3H2 (HCCCH). The observed cyclic-to-linear C3H2 ratio varies from 110 ± 30 for molecular clouds with a total density of about 1 x 104 molecules cm–3 to 30 ± 10 for molecular clouds with a total density of about 4 x 105 molecules cm–3, a trend well reproduced with our updated model. The higher ratio for molecular clouds with low densities is determined mainly by the importance of the H + l-C3H2 - H + c-C3H2 and H + t-C3H2 - H + c-C3H2 isomerization reactions.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): astrochemistry - ISM: abundances - ISM: clouds - ISM: molecules - ISM: molecules

Simbad objects: 16

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2020.01.24-23:40:02

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