The temperature-dependence of rapid low temperature reactions: experiment, understanding and prediction

摘要

Despite the success of the CRHSU (Cine'tique de Reaction en Ecouletncnt Supersoniqiw Unifonne) method in measuring rate coefficients for neutral neutral reactions of radicals down close to the very low temperatures prevalent in dense interstellar clouds (LSCs), 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; thai is, aikynes and alkenes. Based on semi-empirical arguments and correlations of room temperature' rate coefficients, A-(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.