New values of a number of kinetic constants of processes proceeding in oxygen-iodine laser media are presented. The total probabilities of formation of I-2(X, 15 a parts per thousand currency sign v a parts per thousand currency sign 24) and I-2(X, 25 a parts per thousand currency sign v a parts per thousand currency sign 47) molecules in the course of quenching of I* atoms by I-2(X) are found to be 0.9 and 0.1, respectively. The quantum yield of singlet oxygen in the reaction O((1) D) + N2O -> N-2 + O-2(a (1)Delta) is close to 100%. The quenching rate constants of I-2(A') by O-2, H2O, CO2, I-2, and Ar and of I((2) P (1/2)) by O((3) P), O-3, NO2, N2O4, and N2O are presented.