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The aim of this paper is to provide a new set of branching ratios forinterstellar and planetary chemical networks based on a semi empirical model.We applied, instead of zero order theory (i.e. only the most exoergic decayingchannel is considered), a statistical microcanonical model based on theconstruction of breakdown curves and using experimental high velocity collisionbranching ratios for their parametriza- tion. We applied the model toion-molecule, neutral-neutral, and ion-pair reactions implemented in the fewpopular databases for astrochemistry such as KIDA, OSU and UMIST. We studiedthe reactions of carbon and hydrocarbon species with electrons, He+, H+, CH+,CH, C, and C+ leading to intermediate complexes of the type Cn=2,10, Cn=2,4 H,C3 H2, C+n=2,10, Cn=2,4 H+, or C3 H+2 . Comparison of predictions withmeasurements supports the validity of the model. Huge deviations with respectto database values are often obtained. Effects of the new branching ratios intime dependant chemistry for dark clouds and for photodissociation regionchemistry with conditions similar to those found in the Horsehead Nebula arediscussed.

Reactions forming C(0,+)n=2,10, Cn=2,4H(0,+) and C3H(0,+) in the gas phase: semi empirical branching ratios