Temperature dependence of the time evolution of chemiluminescence intensity from gamma-irradiated polytetrafluoroethylene was examined by heating isothermally in the range of 150 and 200 degrees C. Kinetic analysis was carried out to estimate the rate constants, from which the dissociation energy of the O-O bond in the fluoroperoxide group was determined to be 97 + 4 kJ mol(-1), being consistent with the corresponding value for small fluorocarbon model systems obtained by quantum chemical calculations. This strongly supports the emission mechanism [-CF(OOF) CF2- -> -CO-CF2 + OF2 + hv] proposed in our previous paper to explain chemiluminescence from the gamma-irradiated polytetrafluoroethylene. (C) 2014 Elsevier B.V. All rights reserved.