Calculations on the rates, mechanisms, and interstellar importance of the reactions between C and NH2 and between N and CH2
TLDR
In this paper, it was shown that although these reactions do lead initially to the products suggested by astronomers, there is so much excess energy available in both reactions that the HCN and HNC products are able to undergo efficient isomerization reactions after production, which leads to near equal production rates of the two isomers, with HNC slightly favored if there is sufficient rotational excitation.Abstract:
The attempt to understand the temperature dependence of the HNC/HCN abundance ratio in interstellar clouds has been long standing and indecisive. In this paper we report quantum chemical and dynamical studies of two neutral–neutral reactions thought to be important in the formation of HNC and HCN, respectively – C+NH2HNC+H, and N+CH2HCN+H. We find that although these reactions do lead initially to the products suggested by astronomers, there is so much excess energy available in both reactions that the HCN and HNC products are able to undergo efficient isomerization reactions after production. The isomerization leads to near equal production rates of the two isomers, with HNC slightly favoured if there is sufficient rotational excitation. This result has been incorporated into our latest chemical model network of dense interstellar clouds.read more
Citations
More filters
Journal ArticleDOI
The UMIST database for astrochemistry 2012
D. McElroy,Catherine Walsh,A. J. Markwick,Martin A. Cordiner,Martin A. Cordiner,K. W. Smith,Tom J. Millar +6 more
TL;DR: The UMIST Database for Astrochemistry (UDfaa) as mentioned in this paper contains 6173 gas-phase reactions involving 467 species, 47 of which are new to this release.
Journal ArticleDOI
The UMIST Database for Astrochemistry 2006
J. Woodall,Marcelino Agúndez,A. J. Markwick-Kemper,A. J. Markwick-Kemper,Tom J. Millar,Tom J. Millar +5 more
TL;DR: The UMIST Database for Astrochemistry as discussed by the authors contains some 4573 binary gas-phase reactions, an increase of 10% from the previous (1999) version, among 420 species, of which 23 are new to the database.
Journal ArticleDOI
The UMIST database for astrochemistry 2012
D. McElroy,Catherine Walsh,A. J. Markwick,Martin A. Cordiner,Martin A. Cordiner,K. W. Smith,Tom J. Millar +6 more
TL;DR: The UMIST Database for Astrochemistry (UDfaa) as discussed by the authors contains 6173 gas-phase reactions involving 467 species, 47 of which are new to this release.
Journal ArticleDOI
A KInetic Database for Astrochemistry (KIDA)
Valentine Wakelam,Valentine Wakelam,Eric Herbst,Eric Herbst,Jean-Christophe Loison,Jean-Christophe Loison,Ian W. M. Smith,Vijayanand Chandrasekaran,Vijayanand Chandrasekaran,B. Pavone,B. Pavone,N. G. Adams,Marie-Christine Bacchus-Montabonel,Astrid Bergeat,Astrid Bergeat,K. Béroff,Veronica M. Bierbaum,Marin Chabot,Alexander Dalgarno,E. F. van Dishoeck,Alain Faure,Wolf D. Geppert,Dieter Gerlich,Daniele Galli,Eric Hébrard,Eric Hébrard,Franck Hersant,Franck Hersant,Kevin M. Hickson,Kevin M. Hickson,Pascal Honvault,Pascal Honvault,Stephen J. Klippenstein,S. D. Le Picard,Gunnar Nyman,Pascal Pernot,Stephan Schlemmer,Franck Selsis,Franck Selsis,Ian R. Sims,D. Talbi,Jonathan Tennyson,Jürgen Troe,Jürgen Troe,Roland Wester,Laurent Wiesenfeld +45 more
TL;DR: The KInetic Database for Astrochemistry (KIDA) as mentioned in this paper is a database of gas-phase reactions with rate coefficients and uncertainties that will be vetted to the greatest extent possible.
References
More filters
Book
Molecular theory of gases and liquids
TL;DR: Molecular theory of gases and liquids as mentioned in this paper, molecular theory of gas and liquids, Molecular theory of liquid and gas, molecular theories of gases, and liquid theory of liquids, مرکز
Journal ArticleDOI
A fifth-order perturbation comparison of electron correlation theories
TL;DR: In this paper, a new augmented version of coupled-cluster theory, denoted as CCSD(T), is proposed to remedy some of the deficiencies of previous augmented coupledcluster models.
Journal ArticleDOI
Potential energy curves using unrestricted Mo/ller–Plesset perturbation theory with spin annihilation
TL;DR: In this paper, the spin project unrestricted Hartree-Fock bond dissociation curves have a large kink at the onset of the UHF/RHF instability, and a spurious minimum just beyond.
Related Papers (5)
The formation and depletion of molecules in dense interstellar clouds
Eric Herbst,William Klemperer +1 more
A KInetic Database for Astrochemistry (KIDA)
Valentine Wakelam,Valentine Wakelam,Eric Herbst,Eric Herbst,Jean-Christophe Loison,Jean-Christophe Loison,Ian W. M. Smith,Vijayanand Chandrasekaran,Vijayanand Chandrasekaran,B. Pavone,B. Pavone,N. G. Adams,Marie-Christine Bacchus-Montabonel,Astrid Bergeat,Astrid Bergeat,K. Béroff,Veronica M. Bierbaum,Marin Chabot,Alexander Dalgarno,E. F. van Dishoeck,Alain Faure,Wolf D. Geppert,Dieter Gerlich,Daniele Galli,Eric Hébrard,Eric Hébrard,Franck Hersant,Franck Hersant,Kevin M. Hickson,Kevin M. Hickson,Pascal Honvault,Pascal Honvault,Stephen J. Klippenstein,S. D. Le Picard,Gunnar Nyman,Pascal Pernot,Stephan Schlemmer,Franck Selsis,Franck Selsis,Ian R. Sims,D. Talbi,Jonathan Tennyson,Jürgen Troe,Jürgen Troe,Roland Wester,Laurent Wiesenfeld +45 more