Collisional energy transfer in the reactions I + NO + M → INO + M and I + NO2+ M → INO2+ M

The low‐pressure recombination rate constants of the reactions I + NO + M → INO + M (with 14 different M) and I + NO2+ M → INO2+ M (with 26 different M) have been measured at 330°K by laser flash photolysis. The collision efficiencies βcare analyzed and compared with other thermal activation systems. Whereas βcincreases in one reaction with an increasing number of atoms in M, practically no such effect is found when, for the same M, different reactions with varying complexities of the reacting molecules are considered.