The Study of the Reactions Ba+SiCl₄,CH₃SiCl₃ C₆H₅SiCl₃ via LIF and Molecular Beam

The reactions of Ba with SiCl₄, CH₃SiCl₃, and C₆H₅SiCl₃ have been studied by means of LIF in a beam-gas equipment. From the LIF spectra of the computer imitated BaCl product, the comparison of the above reactions with that of Ba with CCl₄, CHCl₃ and CH₂Cl₂ and the conclision of our discussion on the role of the released energy of reaction and the symmetry of the reagents in reactions we discovered that both three Ba reactions might possess the similar mechanism of reaction with that of some photolysis reactions. The reaction Ba+C₆H₅SiCl₃ was supposed to proceed via two different mechanisms simultaneously: （1） Atom Ba attacks directly the Si-Cl bond of C₆H₅SiCl₃ leading to form the BaCl product; （2） The valence electron of Ba transfers into the π^* orbit of benzene ring at first, and then the electron of π^* orbit of benzene ring transfers into the σ^* orbit of C-Cl bond via vibrational coupling leading to from the BaCl product.