RECOMMENDED THERMAL RATE COEFFICIENTS FOR THE C + H 3 + REACTION AND SOME ASTROCHEMICAL IMPLICATIONS

We incorporate our experimentally derived thermal rate coefficients for C + forming CH + and CH 2 + into a commonly used astrochemical model. We find that the Arrhenius–Kooij equation typically used in chemical models does not accurately fit our data and instead we use a more versatile fitting formu...

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Bibliographic Details
Published in:The Astrophysical journal 2016-11, Vol.832 (1), p.31
Main Authors: Vissapragada, S., Buzard, C. F., Miller, K. A., O’Connor, A. P., Ruette, N. de, Urbain, X., Savin, D. W.
Format: Article
Language:English
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Summary:We incorporate our experimentally derived thermal rate coefficients for C + forming CH + and CH 2 + into a commonly used astrochemical model. We find that the Arrhenius–Kooij equation typically used in chemical models does not accurately fit our data and instead we use a more versatile fitting formula. At a temperature of 10 K and a density of 10 4 cm −3 , we find no significant differences in the predicted chemical abundances, but at higher temperatures of 50, 100, and 300 K we find up to factor of 2 changes. In addition, we find that the relatively small error on our thermal rate coefficients, ∼15%, significantly reduces the uncertainties on the predicted abundances compared to those obtained using the currently implemented Langevin rate coefficient with its estimated factor of 2 uncertainty.
ISSN:0004-637X
1538-4357
DOI:10.3847/0004-637X/832/1/31