Presenting original research papers and comments, originating from this world renowned series of meetings in physical chemistry, chemical physics and biophysical chemistry.
Purchasing an Individual Volume
Purchase a recent Faraday Discussion as an individual volume
Subscribers
Non-subscribers
- Purchase article PDF [£24 + taxes]
- Purchase article PDF member offer [£5 + taxes]
Free access
Paper
Faraday Discuss., 2006, 133, 137 - 156, DOI: 10.1039/b600721j
The temperature-dependence of rapid low temperature reactions: experiment, understanding and prediction
Ian W. M. Smith, Amy M. Sage, Neil M. Donahue, Eric Herbst and Donghui Quan
Despite the success of the CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) method in measuring rate coefficients for neutral–neutral reactions of radicals down close to the very low temperatures prevalent in dense interstellar clouds (ISCs), there are still many reactions of potential importance in the chemistry of these objects for which there have been no measurements of low temperature rate coefficients. One important class of reactions is that between atomic and molecular free radicals and unsaturated hydrocarbons; that is, alkynes and alkenes. Based on semi-empirical arguments and correlations of
room temperature
rate coefficients, k(298 K), for reactions of this type with the difference between the ionisation energy of the alkyne/alkene and the electron affinity of the radical, we suggest which reactions between the radicals, C(3P), O(3P), N(4S), CH, C2H and CN, and carbon chain molecules (Cn) and cyanopolyynes (HC2nCN and NCC2nCN) are likely to be fast at the temperature of dense ISCs. These reactions and rate coefficients have been incorporated into a purely gas-phase model (osu2005) of ISC chemistry. The results of these calculations are presented and discussed.
RSS feed
