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The chemiluminescence (GL) reactions of metastable and ground state Ba atoms (Ba(~3D),Ba(~1S)) with Cl_2,I_2 have been studied under single collision conditions. It is found that thereaction Ba(~3D)+Cl_2 does not produce the emission continuum from BaCl_2 but enhances theemission from BaCl, especially the emission from BaCl C~2Πstate. The total collision crosssections for Ba atom removal by Cl_2 are determined to be 65±5A_2 for Ba(~1S) atom and 105±5A_2 for Ba (~3D) atom, respectively. This result is in agreement with the result calculatedby electron harpooning model. The higher resolution CL spectrum of Pal (C_2Π_(3/2)-X~2∑~+)△v =0 band produced by Ba(~3D)+I_2 reaction is also obtained. From an approximate calculation,it is found that the vibrational population of the BaI (C~2Π_(3/2)) state has a non-statistical dis-tribution. By the extended harpooning model, the experimental results have qualitatively beenexplained.
The chemiluminescence (GL) reactions of metastable and ground state Ba atoms (Ba (~ 3D), Ba (~ 1S)) with Cl_2, I_2 have been studied under single collision conditions. It is found that thereaction Ba (~ 3D) + Cl_2 The total collision crosssections for Ba atom removal by Cl_2 are determined to be 65 ± 5A_2 for Ba (~ 1S) atom and 105 ± 5A_2 for Ba (~ 3D) atom, respectively. This result is in agreement with the result calculatedby electron harpooning model. The higher resolution CL spectrum of Pal (C_2Π_ (3/2) -X ~ 2Σ ~ +) △ v = 0 From an approximate calculation, it is found that the vibrational population of the BaI (C ~ 2Π_ (3/2)) state has a non-statistical dis-tribution. By the extended harpooning model, the experimental results have qualitatively beenexplained.