We note that these energies are slightly lower than the neutral decomposition of C2H2 and that C2H • is the most probable hydrocarbon found in our plasma discharge. We also looked into EA and ionization reactions of C3H3 • (see Table ), to see what species that might be found in the plasma. We speculate that C3H3 • as well could proceed to decompose and be a contributing source of hydrocarbons.