Study of Dynamics of the Reactions Ba(¹S)+CH_4-nCl_n and Ba(¹S)+C₂H_6-nCl_n

The vibrational distributions of the BaCl produced in the reactions Ba (¹S) + CH_4-n Cl_n→BaCl+CH_4-nCl_n-1 and Ba (¹S)+C₂H_6-n Cl_n→BaCl+C₂H_6-nCl_n-1 were studied by the method of laser induced fluorescence using in a beamgas arrangement. It is found that the reaction mechanism of these reactions relates to the number of n and the stucture of the reagent molecule, and shows some regularities with these two factors. The reaction Ba(¹S)+C₂H₃Cl₃ (1, 1, 2) is thought to proceed via two different mechanisms simultaneously:(1) Ba atom attacks directly the Cl₂CH end of the Cl₂CHCH₂Cl molecule leading to the formation or BaCl with high vibrational energy; (2) Ba atom attacks directly the ClCH₂ end of the Cl₂CHCH₂Cl molecule leading to the formation of BaCl with low vibrational energy. The branching ratio of this reaction was found to be 11.5:1.