The distributions of vibrational, rotational and translational energies in the products of atom-diatomic molecule reactions are studied on the basis of their ‘‘temperature parametere’. The validity of the vibrational temperature concept, which my characterize the variaous distributions, is examined from different points of view. The analysis is done on the basis of available data from chemiluminescence, chemical laser and molecular beams measurements and from classical trajectory calculations. All the reactions investigated are exothermic with exothermicities ranging between approximate to 17 kcal/mole and approximate to 85 kcal/mole. In most products a high degree of population inversion is found. An attempt is made to predict the complete vibrotational state distribution using the vibrational temperature only. This attempt is equivalent to the assumption that apart from the vibration, the other degrees of freedom have reached a (microcanonical) equilibrium. The agreement with experimental results is good.