THE STUDIES ON THE REACTION OF BA WITH CHCL3, CCL4 BY MOLECULAR-BEAM TECHNIQUES

On a crossed beam apparatus and on a beam-gas apparatus, the reactions Ba(3D) + CCl4, CHCl3 and the reactions Ca(S-1(0)), Ca(3P), Ba(S-1(0), Ba(3D)+CCl4 have been studied by means of chemiluminescence (CL) and laser induced fluorescence (LIF), respectively. The plot of the CL cross sections of producing BaCl (A2-PI, B-2-SIGMA+) from the reactions Ba(3D)+CHCl3, CCl4 versus collision energy were obtained. It has been shown that the plot for the reaction Ba(3D)+CCl4 can be described by LOC model, and the plot for the reaction Ba(3D)+CHCl3 can be described by rigid nonspherical molecules, developed by Evans and Bernstein et al. The LIF study shows that for the reactions of Ca(S-1(0)), Ca(3P) with CCl4, the change of Ca(S-1(0)) to Ca(3P) brought about an increase of the ground state CaCl product rotation energy; but for the reactions Ba(S-1(0)), Ba(3D)+CCl4, the change of Ba(S-1(0)) to Ba(3D) brought about an increase of the ground state BaCl product vibration energy, which can be explained by the "Impulse model of the atom-molecule reaction".