Temperature dependence of rate constants of the reactions Br(Br*)+IBr → Br2+I

Rate constant and their temperature dependence in the range from -25 to +50 deg C for reactions Br(2P3/2)+IBr → Br2+I(2P2/3) and Br*(2P1/2)+IBr → Br2+I(2P3/2) have been measured by the method of laser atomic-resonance spectroscopy using radiation of iodine and bromine lasers. It has been detected that at 300 K the values of k1 and k2 agree with the known ones, meanwhile with the temperature growth both constants increase, moreover, for k2 the temperature dependence is much stronger. It is shown that the value of deceleration of the rate of reaction between Br atom and IBr in case of its spin-orbital excitation is the function of the temperature, decreasing with the temperature increase. 14 refs.; 3 figs.; 2 tabs