束－气反应Ba＋ClC_2H_2Br、Ba＋C_3H_5Br、Ba＋n－C_3H

The Laser-induced Fluorescence Study of the Beam-gas Reactions Ba+CIC_2H_2Br, Ba+C_3H5Br, Ba+n-C_3H_7Br

在分子束－气条件下，研究了反应Ｂａ＋ＣｌＣ２Ｈ２Ｂｒ、Ｂａ＋Ｃ３Ｈ５Ｂｒ、Ｂａ＋ｎ－Ｃ３Ｈ７Ｂｒ，得到了这些反应的产物ＢａＢｒ的ＬＩＦ光谱。考察了烯烃中双键对反应的影响。结果表明：溴丙烯中双键的存在使产物ＢａＢｒ的振动激发和反应截面增大，溴氯乙烯中双键的存在使产物的振动激发和反应截面减小，而氯原子的存在对产物的振动激发有促进作用。

In the present paper, the internal state distributions of BaBr produced from the beam-gas reactions Ba+ClC2H2Br, Ba+C3H5Br, Ba+n-C3H7Brhave been obtained. It has been shown that the double bond of C3H5Br increases the reactive cross section and vibrational excitation of the reaction Ba+C3H5Br,and that the double bond of ClC2H2Br decreases but the Cl atom of ClC2H2Brincreases the reactive cross section and vibrational excitation of the BaBr product of the reaction Ba+ClC2H2Br. In addition, it has been predicted that the reactive mechanism of Ba+ClC2H2Br, Ba+C3H5Br is different from that of Ba+C2H5Br, Ba+n-C3H7Br.