Formation of AlCl by radiative association

The rate coefficient for the formation of aluminium monochloride, AlCl, from the radiative association of aluminium and chlorine atoms is estimated as a function of temperature. The coupling of the Al and Cl atoms through the A 1 molecular electronic state, which undergoes radiative transition to the X 1 + ground state, is the most efficient transition to form AlCl. The rate constant was found to vary with temperature according to the expressions k(T) = 1.22 10 -16 (T/300) 0.40 exp (-748/T) cm 3 s -1 for temperatures between 300 and 1000 K, and k(T) = 2.20 10 -16 (T/300) 0.175 exp (-1067/T) cm 3 s -1 for temperatures between 1000 and 14 000 K.