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On the temperature dependence of the rate coefficient of formation of C+2 from C + CH+.

Authors :
Rampino, S.
Pastore, M.
Garcia, E.
Pacifici, L.
Laganà, A.
Source :
Monthly Notices of the Royal Astronomical Society; 8/11/2016, Vol. 460 Issue 3, p2368-2375, 8p
Publication Year :
2016

Abstract

We carry out quasi-classical trajectory calculations for the C + CH<superscript>+</superscript>→ C<superscript>+</superscript><subscript>2</subscript> + H reaction on an ad hoc computed high-level ab initio potential energy surface. Thermal rate coefficients at the temperatures of relevance in cold interstellar clouds are derived and compared with the assumed, temperature-independent estimates publicly available in kinetic data bases KIDA and UDfA. For a temperature of 10 K the data base value overestimates by a factor of 2 the one obtained by us (thus improperly enhancing the destruction route of CH<superscript>+</superscript> in astrochemical kinetic models) which is seen to double in the temperature range 5-300 K with a sharp increase in the first 50 K. The computed values are fitted via the popular Arrhenius-Kooij formula and best-fitting parameters α = 1.32 ? 10<superscript>-9</superscript> cm³ s<superscript>-1</superscript>, β = 0.1 and γ = 2.19 K to be included in the online mentioned data bases are provided. Further investigation shows that the temperature dependence of the thermal rate coefficient better conforms to the recently proposed so-called 'deformed Arrhenius' law by Aquilanti and Mundim. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00358711
Volume :
460
Issue :
3
Database :
Complementary Index
Journal :
Monthly Notices of the Royal Astronomical Society
Publication Type :
Academic Journal
Accession number :
116772946
Full Text :
https://doi.org/10.1093/mnras/stw1116