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本文在分子束单次碰撞条件下,研究了基态和亚稳态Ba原子与Cl_2,I_2气体的化学发光反应.发现亚稳态Ba原子的反应不产生BaCl_2的连续辐射,而却增加了BaCl的辐射,特别是其C~2II态的辐射.测得金属原子被Cl_2分子碰撞消除的总截面,对基态Ba原子是65±5A~2,对亚稳态Ba原子是105±5A~2,与电子跳跃(鱼叉)模型计算结果一致.还获得Ba(~3D)+I_2反应产生BaI(~2II3/2--~2∑~+)跃迁△v=0辐射带高分辨光谱,近似计算结果说明,BaI(C~2II3/2)态具有非统计振动布居.用推广的鱼叉模型对实验结果作了定性解释
In this paper, the chemiluminescence reaction of ground state and metastable Ba atoms with Cl_2 and I_2 gases was studied under the single-beam collision conditions. It was found that the reaction of metastable Ba atoms did not produce continuous radiation of BaCl_2, but increased the emission of BaCl Radiation, especially its C ~ 2II state.It was found that the total cross section of the metal atoms eliminated by collision of Cl_2 molecules is 65 ± 5A ~ 2 for the ground state Ba atoms and 105 ± 5A ~ 2 for the metastable Ba atoms, and The calculated result of the electron hopping (harpoon) model is consistent with that obtained by the Ba (~ 3D) + I_2 reaction, and the high resolution spectrum of the △ v = 0 transition band of BaI (~ 2II3 / 2- ~ ~ 2Σ ~ +) The results show that the BaI (C ~ 2II3 / 2) state has non-statistical vibrational population, and the qualitative analysis of the experimental results